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  • 51. Blair, Matthew W.
    et al.
    Cortés, Andrés J.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    This, Dominique
    Identification of an ERECTA gene and drought adaptation associations in wild and cultivated common bean2016Inngår i: Plant Science, ISSN 0168-9452, E-ISSN 1873-2259, Vol. 242, s. 250-259Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this research, we cloned and accessed nucleotide diversity in the common beanERECTA gene which has been implicated in drought tolerance and stomatal patterning.The homologous gene segment was isolated with degenerate primer and was found to be located on Chromosome 1. The gene had at least one paralog on Chromosome 9 and duplicate copies in soybean for each homolog. ERECTA-like genes were also discovered but the function of these was of less interest due to low similarity with the ERECTA gene from Arabidopsis. The diversity of the 5’ end of the large Chr. 1 PvERECTA gene was evaluated in a collection of 145 wild and cultivated common beans that were also characterized by geographic source and drought tolerance, respectively. Our wild population sampled a range of wet to dry habitats, while our cultivated samples were representative of landrace diversity and the patterns of nucleotide variation differed between groups. The 5’ region exhibited lower levels of diversity in the cultivated collection, which was indicative of population bottlenecks associated with the domestication process, compared to the wild collection where diversity was associated with ecological differences. We discuss associations of nucleotide diversity at PvERECTA with drought tolerance prediction for the genotypes.

  • 52. Blake, S.
    et al.
    Wikelski, M.
    Cabrera, F.
    Guezou, A.
    Silva, M.
    Sadeghayobi, Elham
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Yackulic, C. B.
    Jaramillo, P.
    Seed dispersal by Galápagos tortoises2012Inngår i: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699, Vol. 39, nr 11, s. 1961-1972Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Aim Large-bodied vertebrates often have a dramatic role in ecosystem function through herbivory, trampling, seed dispersal and nutrient cycling. The iconic Galápagos tortoises (Chelonoidis nigra) are the largest extant terrestrial ectotherms, yet their ecology is poorly known. Large body size should confer a generalist diet, benign digestive processes and long-distance ranging ability, rendering giant tortoises adept seed dispersers. We sought to determine the extent of seed dispersal by Galápagos tortoises and their impact on seed germination for selected species, and to assess potential impacts of tortoise dispersal on the vegetation dynamics of the Galápagos. Location Galápagos, Ecuador. Methods To determine the number of seeds dispersed we identified and counted intact seeds from 120 fresh dung piles in both agricultural and national park land. To estimate the distance over which tortoises move seeds we used estimated digesta retention times from captive tortoises as a proxy for retention times of wild tortoises and tortoise movement data obtained from GPS telemetry. We conducted germination trials for five plant species to determine whether tortoise processing influenced germination success. Results In our dung sample, we found intact seeds from >45 plant species, of which 11 were from introduced species. Tortoises defecated, on average, 464 (SE 95) seeds and 2.8 (SE 0.2) species per dung pile. Seed numbers were dominated by introduced species, particularly in agricultural land. Tortoises frequently moved seeds over long distances; during mean digesta retention times (12days) tortoises moved an average of 394m (SE 34) and a maximum of 4355m over the longest recorded retention time (28days). We did not find evidence that tortoise ingestion or the presence of dung influenced seed germination success. Main conclusions Galápagos tortoises are prodigious seed dispersers, regularly moving large quantities of seeds over long distances. This may confer important advantages to tortoise-dispersed species, including transport of seeds away from the parent plants into sites favourable for germination. More extensive research is needed to quantify germination success, recruitment to adulthood and demography of plants under natural conditions, with and without tortoise dispersal, to determine the seed dispersal effectiveness of Galápagos tortoises.

  • 53.
    Boberg, Elin
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Alexandersson, Ronny
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Jonsson, Magdalena
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Maad, Johanne
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ågren, Jon
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Nilsson, Anders L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Pollinator shifts and the evolution of spur length in the moth-pollinated orchid Platanthera bifolia2014Inngår i: Annals of Botany, ISSN 0305-7364, E-ISSN 1095-8290, Vol. 113, nr 2, s. 267-275Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Plantpollinator interactions are thought to have shaped much of floral evolution. Yet the relative importance of pollinator shifts and coevolutionary interactions for among-population variation in floral traits in animal-pollinated species is poorly known. This study examined the adaptive significance of spur length in the moth-pollinated orchid Platanthera bifolia. Geographical variation in the length of the floral spur of P. bifolia was documented in relation to variation in the pollinator fauna across Scandinavia, and a reciprocal translocation experiment was conducted in south-east Sweden between a long-spurred woodland population and a short-spurred grassland population. Spur length and pollinator fauna varied among regions and habitats, and spur length was positively correlated with the proboscis length of local pollinators. In the reciprocal translocation experiment, long-spurred woodland plants had higher pollination success than short-spurred grassland plants at the woodland site, while no significant difference was observed at the grassland site. The results are consistent with the hypothesis that optimal floral phenotype varies with the morphology of the local pollinators, and that the evolution of spur length in P. bifolia has been largely driven by pollinator shifts.

  • 54.
    Bodare, Sofia
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Conservation Genetics and Speciation in Asian Forest Trees2013Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Tropical forests are important because they are the home of millions of species at the same time as they perform ecosystem services and provide food, cash income and raw materials for the people living there. The present thesis elucidates questions relevant to the conservation of selected forest trees as it adds to the knowledge in the phylogeny, population structure, genetic diversity and adaptation in these species.

    We investigated the genetic diversity and speciation of four spruce species around the Qinghai-Tibetan Plateau (QTP), Western China, and one from Taiwan. Nucleotide diversity was low in P. schrenkiana and the Taiwanese P. morrisonicola but higher in P. likiangensis, P. purpurea and P. wilsonii. This can be explained by the population bottlenecks that were detected in the two former species by coalescent-based analysis. The phylogenetic relationships between the five species were difficult to interpret, possibly because other Asian spruce species might have been involved. However, all species are distinct except P. purpurea, which likely has a hybrid origin. 

    The rate of bud set and expression of the FTL2 gene in response to photoperiod in the southernmost growing spruce species, P. morrisonicola, was studied. We found that in this species, although growing near the equator, bud set appears to be induced mainly by a shortening of photoperiod, similarly to its more northerly growing spruce relatives. In addition, seedlings originating from mother trees growing at higher elevations showed a trend towards earlier bud set than seedlings originating from mother trees at lower altitudes.

    We also studied the population structure and genetic diversity in the endemic white cedar (Dysoxylum malabaricum) in the Western Ghats, India. Overall, no increase in inbreeding that could be related to human activities could be detected. Populations appear to have maintained genetic diversity and gene flow in spite of forest fragmentation over the distribution range. However, there is a severe lack of juveniles and young adults in several populations that needs to be further addressed. Finally, we recommend conservation units based on population structure.

    Delarbeid
    1. Demographic histories of four spruce (Picea) species of the Qinghai-Tibetan Plateau and neighboring areas inferred from multiple nuclear loci
    Åpne denne publikasjonen i ny fane eller vindu >>Demographic histories of four spruce (Picea) species of the Qinghai-Tibetan Plateau and neighboring areas inferred from multiple nuclear loci
    Vise andre…
    2010 (engelsk)Inngår i: Molecular biology and evolution, ISSN 0737-4038, E-ISSN 1537-1719, Vol. 27, nr 5, s. 1001-1014Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Nucleotide variation at 12 to 16 nuclear loci was studied in three spruce species from the Qinghai-Tibetan Plateau (QTP), Picea likiangensis, P. wilsonii and P. purpurea, and one species from the Tian Shan mountain range, P. schrenkiana. Silent nucleotide diversity was limited in P. schrenkiana and high in the three species from the QTP, with values higher than in boreal spruce species, despite their much more restricted distributions compared to that of the boreal species. In contrast to European boreal species that have experienced severe bottlenecks in the past, coalescent-based analysis suggests that DNA polymorphism in the species from the QTP and adjacent areas is compatible with the standard neutral model (P. likiangensis, P. wilsonii, P. schrenkiana) or with population growth (P. purpurea). In order to test if P. purpurea is a diploid hybrid of P. likiangensis and P. wilsonii, we used a combination of approaches, including model based inference of population structure, Isolation-with-Migration models and recent theoretical results on the effect of introgression on the geographic distribution of diversity. In contrast to the three other species, each of which was predominantly assigned to a single cluster in the Structure analysis, P. purpurea individuals were scattered over the three main clusters and not, as we had expected, confined to the P. likiangensis and P. wilsonii clusters. Furthermore the contribution of P. schrenkiana was by far the largest one. In agreement with this, the divergence between P. purpurea and P. schrenkiana was lower than the divergence of either P. likiangensis or P. wilsonii from P. schrenkiana. These results, together with previous ones showing that P. purpurea and P. wilsonii share the same haplotypes at both chloroplast and mitochondrial markers, suggest that P. purpurea has a complex origin, possibly involving additional species.

    Emneord
    Picea, Qinghai Tibetan Plateau, effective population size, divergence time, introgression, speciation
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-121399 (URN)10.1093/molbev/msp301 (DOI)000276994800004 ()20031927 (PubMedID)
    Tilgjengelig fra: 2010-03-23 Laget: 2010-03-23 Sist oppdatert: 2017-12-12bibliografisk kontrollert
    2. Origin and demographic history of the endemic Taiwan spruce (Picea morrisonicola)
    Åpne denne publikasjonen i ny fane eller vindu >>Origin and demographic history of the endemic Taiwan spruce (Picea morrisonicola)
    2013 (engelsk)Inngår i: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 3, nr 10, s. 3320-3333Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Taiwan spruce (Picea morrisonicola) is a vulnerable conifer species endemic to the island of Taiwan. A warming climate and competition from subtropical tree species has limited the range of Taiwan spruce to the higher altitudes of the island. Using seeds sampled from an area in the central mountain range of Taiwan, 15 nuclear loci were sequenced in order to measure genetic variation and to assess the long-term genetic stability of the species. Genetic diversity is low and comparable to other spruce species with limited ranges such as Picea breweriana, Picea chihuahuana, and Picea schrenkiana. Importantly, analysis using approximate Bayesian computation (ABC) provides evidence for a drastic decline in the effective population size approximately 0.3–0.5 million years ago (mya). We used simulations to show that this is unlikely to be a false-positive result due to the limited sample used here. To investigate the phylogenetic origin of Taiwan spruce, additional sequencing was performed in the Chinese spruce Picea wilsonii and combined with previously published data for three other mainland China species, Picea purpurea, Picea likiangensis, and P. schrenkiana. Analysis of population structure revealed that P. morrisonicola clusters most closely with P. wilsonii, and coalescent analyses using the program MIMAR dated the split to 4–8 mya, coincidental to the formation of Taiwan. Considering the population decrease that occurred after the split, however, led to a much more recent origin.

    HSV kategori
    Forskningsprogram
    Biologi med inriktning mot evolutionär funktionsgenomik
    Identifikatorer
    urn:nbn:se:uu:diva-198100 (URN)10.1002/ece3.698 (DOI)000324932600011 ()
    Merknad

    De två (2) första författarna delar förstaförfattarskapet.

    Tilgjengelig fra: 2013-04-09 Laget: 2013-04-09 Sist oppdatert: 2017-12-06bibliografisk kontrollert
    3. Photoperiodic control of bud set and FTL2 expression in a tropical spruce species  (Picea morrisonicola)
    Åpne denne publikasjonen i ny fane eller vindu >>Photoperiodic control of bud set and FTL2 expression in a tropical spruce species  (Picea morrisonicola)
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Forskningsprogram
    Biologi med inriktning mot evolutionär funktionsgenomik
    Identifikatorer
    urn:nbn:se:uu:diva-198107 (URN)
    Tilgjengelig fra: 2013-04-09 Laget: 2013-04-09 Sist oppdatert: 2013-08-30
    4. Genetic structure and demographic history of the endangered tree species, Dysoxylum  malabaricum (Meliaceae) in Western Ghats, India: Implications for conservation in a  biodiversity hotspot
    Åpne denne publikasjonen i ny fane eller vindu >>Genetic structure and demographic history of the endangered tree species, Dysoxylum  malabaricum (Meliaceae) in Western Ghats, India: Implications for conservation in a  biodiversity hotspot
    Vise andre…
    2013 (engelsk)Inngår i: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 3, nr 10, s. 3233-3248Artikkel i tidsskrift (Annet vitenskapelig) Published
    Abstract [en]

    The impact of fragmentation by human activities on genetic diversity of forest trees is an important concern in forest conservation, especially in tropical forests. Dysoxylummalabaricum (white cedar) is an economically important tree species, endemic to theWestern Ghats, India, one of the world's eight most important biodiversity hotspots. As D.malabaricum is under pressure of disturbance and fragmentation together with overharvesting, conservation efforts are required in this species. In this study, range-widegenetic structure of twelve D.malabaricum populations was evaluated to assess the impact ofhuman activities on genetic diversity and infer the species' evolutionary history, using both nuclear and chloroplast (cp) DNA simple sequence repeats (SSR). As genetic diversity and population structure did not differ among seedling, juvenile and adult age classes, reproductive success among the old-growth trees and long distance seed dispersal by hornbills were suggested to contribute to maintain genetic diversity. The fixation index (F-IS) was significantly correlated with latitude, with a higher level of inbreeding in the northern populations, possibly reflecting a more severe ecosystem disturbance in those populations. Both nuclear and cpSSRs revealed northern and southern genetic groups with some discordance of their distributions; however, they did not correlate with any of the two geographic gaps known as genetic barriers to animals. Approximate Bayesian computation-based inference from nuclear SSRs suggested that population divergence occurred beforethe last glacial maximum. Finally we discussed the implications of these results, in particularthe presence of a clear pattern of historical genetic subdivision, on conservation policies.

    HSV kategori
    Forskningsprogram
    Biologi med inriktning mot evolutionär funktionsgenomik
    Identifikatorer
    urn:nbn:se:uu:diva-198109 (URN)10.1002/ece3.669 (DOI)000324932600004 ()
    Merknad

    De två (2) första författarna delar förstaförfattarskapet.

    Tilgjengelig fra: 2013-04-09 Laget: 2013-04-09 Sist oppdatert: 2017-12-06bibliografisk kontrollert
    5. Landscape and fine-scale genetic structure of white cedar (Dysoxylum malabaricum) in disturbed forest patches of the Western Ghats, India
    Åpne denne publikasjonen i ny fane eller vindu >>Landscape and fine-scale genetic structure of white cedar (Dysoxylum malabaricum) in disturbed forest patches of the Western Ghats, India
    Vise andre…
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    Emneord
    Conservation genetics, Dysoxylum malabaricum, fragmentation, land use, spatial genetic structure, Western Ghats
    HSV kategori
    Forskningsprogram
    Biologi med inriktning mot populationsbiologi
    Identifikatorer
    urn:nbn:se:uu:diva-198700 (URN)
    Forskningsfinansiär
    Sida - Swedish International Development Cooperation Agency
    Tilgjengelig fra: 2013-04-23 Laget: 2013-04-23 Sist oppdatert: 2013-08-30
  • 55.
    Bodare, Sofia
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Källman, Thomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Lagercrantz, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Photoperiodic control of bud set and FTL2 expression in a tropical spruce species  (Picea morrisonicola)Manuskript (preprint) (Annet vitenskapelig)
  • 56.
    Bodare, Sofia
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ravikanth, G
    Ashoka Trust for Research in Ecology and the Environment.
    Sascha A, Ismail
    Department of Environmental Systems Science, ETH Zürich.
    Kumara Patel, Mohana
    University of Agricultural Sciences, Bangalore .
    Spanu, Ilaria
    Plant Genetics Institute National Research Council.
    Vasudeva, R
    Dharwad College of Forestry, Campus Karnataka .
    Uma Shaanker, R
    Ashoka Trust for Research in Ecology and the Environment.
    Vendramin, Giovanni Giuseppe
    5Plant Genetics Institute National Research Council.
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Landscape and fine-scale genetic structure of white cedar (Dysoxylum malabaricum) in disturbed forest patches of the Western Ghats, IndiaManuskript (preprint) (Annet vitenskapelig)
  • 57.
    Bodare, Sofia
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ravikanth, Gudasalamani
    Ashoka Trust Res Ecol & Environm, Bangalore 560064, Karnataka, India.;Univ Agr Sci, Sch Ecol & Conservat, Bangalore 560065, Karnataka, India..
    Ismail, Sascha A.
    Swiss Fed Inst Technol, Dept Environm Syst Sci, Ecosyst Management, Univ Str 16, CH-8092 Zurich, Switzerland..
    Patel, Mohana Kumara
    Univ Agr Sci, Sch Ecol & Conservat, Bangalore 560065, Karnataka, India..
    Spanu, Ilaria
    CNR, Inst Biosci & Bioresources, Via Madonna del Piano 10, I-50019 Florence, Italy..
    Vasudeva, Ramesh
    Univ Agr Sci, Dept Forest Biol, Coll Forestry, Sirsi 581401, Karnataka, India..
    Shaanker, Ramanan Uma
    Ashoka Trust Res Ecol & Environm, Bangalore 560064, Karnataka, India.;Univ Agr Sci, Sch Ecol & Conservat, Bangalore 560065, Karnataka, India.;Univ Agr Sci, Dept Crop Physiol, Bangalore 560065, Karnataka, India..
    Vendramin, Giovanni Giuseppe
    CNR, Inst Biosci & Bioresources, Via Madonna del Piano 10, I-50019 Florence, Italy..
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Tsuda, Yoshiaki
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution. Univ Tsukuba, Sugadaira Montane Res Ctr, 1278-294 Sugadairakogen, Ueda, Nagano 3862204, Japan..
    Fine- and local- scale genetic structure of Dysoxylum malabaricum, a late-successional canopy tree species in disturbed forest patches in the Western Ghats, India2017Inngår i: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 18, nr 1, s. 1-15Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Dysoxylum malabaricum (white cedar) is an economically important tree species, endemic to the Western Ghats, India, which is the world's most densely populated biodiversity hotspot. In this study, we used variation at ten nuclear simple sequence repeat loci to investigate genetic diversity and fine scale spatial genetic structure (FSGS) in seedlings and adults of D. malabaricum from four forest patches in the northern part of the Western Ghats. When genetic variation was compared between seedlings and adults across locations, significant differences were detected in allelic richness, observed heterozygosity, fixation index (F (IS)), and relatedness (P < 0.05). Reduced genetic diversity and increased relatedness at the seedling stage might be due to fragmentation and disturbance. There was no FSGS at the adult stage and FSGS was limited to shorter distance classes at the seedling stage. However, there was clear spatial genetic structure at the landscape level (< 50 km), regardless of age class, due to limited gene flow between forest patches. A comparison of the distributions of size classes in the four locations with published data from a more southern area, showed that large trees (diameter at breast height, DBH, > 130 cm) are present in the southern sacred forests but not in the northern forest reserves. This pattern is likely due to stronger harvesting pressure in the north compared to the south, because in the north there are no cultural taboos regulating the extraction of natural resources. The implications for forest conservation in this biodiversity hotspot are discussed.

  • 58.
    Bodare, Sofia
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för evolution, genomik och systematik, Evolutionär funktionsgenomik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Stocks, Michael
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Yang, J-C
    Taiwan Forestry Research Institute.
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Origin and demographic history of the endemic Taiwan spruce (Picea morrisonicola)2013Inngår i: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 3, nr 10, s. 3320-3333Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Taiwan spruce (Picea morrisonicola) is a vulnerable conifer species endemic to the island of Taiwan. A warming climate and competition from subtropical tree species has limited the range of Taiwan spruce to the higher altitudes of the island. Using seeds sampled from an area in the central mountain range of Taiwan, 15 nuclear loci were sequenced in order to measure genetic variation and to assess the long-term genetic stability of the species. Genetic diversity is low and comparable to other spruce species with limited ranges such as Picea breweriana, Picea chihuahuana, and Picea schrenkiana. Importantly, analysis using approximate Bayesian computation (ABC) provides evidence for a drastic decline in the effective population size approximately 0.3–0.5 million years ago (mya). We used simulations to show that this is unlikely to be a false-positive result due to the limited sample used here. To investigate the phylogenetic origin of Taiwan spruce, additional sequencing was performed in the Chinese spruce Picea wilsonii and combined with previously published data for three other mainland China species, Picea purpurea, Picea likiangensis, and P. schrenkiana. Analysis of population structure revealed that P. morrisonicola clusters most closely with P. wilsonii, and coalescent analyses using the program MIMAR dated the split to 4–8 mya, coincidental to the formation of Taiwan. Considering the population decrease that occurred after the split, however, led to a much more recent origin.

  • 59.
    Bodare, Sofia
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Tsuda, Yoshiaki
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ravikanth, G
    Ashoka Trust for Research in Ecology and the Environment.
    Uma Shaanker, R
    Ashoka Trust for Research in Ecology and the Environment.
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Genetic structure and demographic history of the endangered tree species, Dysoxylum  malabaricum (Meliaceae) in Western Ghats, India: Implications for conservation in a  biodiversity hotspot2013Inngår i: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 3, nr 10, s. 3233-3248Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    The impact of fragmentation by human activities on genetic diversity of forest trees is an important concern in forest conservation, especially in tropical forests. Dysoxylummalabaricum (white cedar) is an economically important tree species, endemic to theWestern Ghats, India, one of the world's eight most important biodiversity hotspots. As D.malabaricum is under pressure of disturbance and fragmentation together with overharvesting, conservation efforts are required in this species. In this study, range-widegenetic structure of twelve D.malabaricum populations was evaluated to assess the impact ofhuman activities on genetic diversity and infer the species' evolutionary history, using both nuclear and chloroplast (cp) DNA simple sequence repeats (SSR). As genetic diversity and population structure did not differ among seedling, juvenile and adult age classes, reproductive success among the old-growth trees and long distance seed dispersal by hornbills were suggested to contribute to maintain genetic diversity. The fixation index (F-IS) was significantly correlated with latitude, with a higher level of inbreeding in the northern populations, possibly reflecting a more severe ecosystem disturbance in those populations. Both nuclear and cpSSRs revealed northern and southern genetic groups with some discordance of their distributions; however, they did not correlate with any of the two geographic gaps known as genetic barriers to animals. Approximate Bayesian computation-based inference from nuclear SSRs suggested that population divergence occurred beforethe last glacial maximum. Finally we discussed the implications of these results, in particularthe presence of a clear pattern of historical genetic subdivision, on conservation policies.

  • 60. Borgegård, S.-O.
    et al.
    Morander, R.
    Rydin, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Vegetationen på skär bildade vid Hjälmarsänkningen i hundraårigt perspektiv1987Inngår i: Årsbok 1987, Hembygdsföreningen Arboga Minne , 1987Kapittel i bok, del av antologi (Fagfellevurdert)
  • 61. Borgegård, S.-O.
    et al.
    Rydin, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Biomass, root penetration and heavy metal uptake in birch in a soil cover over copper tailings1989Inngår i: Journal of Applied Ecology, Vol. 26, s. 585-595Artikkel i tidsskrift (Fagfellevurdert)
  • 62. Borgegård, S.-O.
    et al.
    Rydin, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Utilization of waste products and inorganic fertilizer in the restoration of iron-mine tailings1989Inngår i: Journal of Applied Ecology, Vol. 26, s. 1083-1088Artikkel i tidsskrift (Fagfellevurdert)
  • 63. Bowman, John L
    et al.
    Kohchi, Takayuki
    Yamato, Katsuyuki T
    Jenkins, Jerry
    Shu, Shengqiang
    Ishizaki, Kimitsune
    Yamaoka, Shohei
    Nishihama, Ryuichi
    Nakamura, Yasukazu
    Berger, Frédéric
    Adam, Catherine
    Aki, Shiori Sugamata
    Althoff, Felix
    Araki, Takashi
    Arteaga-Vazquez, Mario A
    Balasubrmanian, Sureshkumar
    Barry, Kerrie
    Bauer, Diane
    Boehm, Christian R
    Briginshaw, Liam
    Caballero-Perez, Juan
    Catarino, Bruno
    Chen, Feng
    Chiyoda, Shota
    Chovatia, Mansi
    Davies, Kevin M
    Delmans, Mihails
    Demura, Taku
    Dierschke, Tom
    Dolan, Liam
    Dorantes-Acosta, Ana E
    Eklund, D. Magnus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution. Monash Univ, Sch Biol Sci, Melbourne, Vic 3800, Australia.
    Florent, Stevie N
    Flores-Sandoval, Eduardo
    Fujiyama, Asao
    Fukuzawa, Hideya
    Galik, Bence
    Grimanelli, Daniel
    Grimwood, Jane
    Grossniklaus, Ueli
    Hamada, Takahiro
    Haseloff, Jim
    Hetherington, Alexander J
    Higo, Asuka
    Hirakawa, Yuki
    Hundley, Hope N
    Ikeda, Yoko
    Inoue, Keisuke
    Inoue, Shin-Ichiro
    Ishida, Sakiko
    Jia, Qidong
    Kakita, Mitsuru
    Kanazawa, Takehiko
    Kawai, Yosuke
    Kawashima, Tomokazu
    Kennedy, Megan
    Kinose, Keita
    Kinoshita, Toshinori
    Kohara, Yuji
    Koide, Eri
    Komatsu, Kenji
    Kopischke, Sarah
    Kubo, Minoru
    Kyozuka, Junko
    Lagercrantz, Ulf
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Lin, Shih-Shun
    Lindquist, Erika
    Lipzen, Anna M
    Lu, Chia-Wei
    De Luna, Efraín
    Martienssen, Robert A
    Minamino, Naoki
    Mizutani, Masaharu
    Mizutani, Miya
    Mochizuki, Nobuyoshi
    Monte, Isabel
    Mosher, Rebecca
    Nagasaki, Hideki
    Nakagami, Hirofumi
    Naramoto, Satoshi
    Nishitani, Kazuhiko
    Ohtani, Misato
    Okamoto, Takashi
    Okumura, Masaki
    Phillips, Jeremy
    Pollak, Bernardo
    Reinders, Anke
    Rövekamp, Moritz
    Sano, Ryosuke
    Sawa, Shinichiro
    Schmid, Marc W
    Shirakawa, Makoto
    Solano, Roberto
    Spunde, Alexander
    Suetsugu, Noriyuki
    Sugano, Sumio
    Sugiyama, Akifumi
    Sun, Rui
    Suzuki, Yutaka
    Takenaka, Mizuki
    Takezawa, Daisuke
    Tomogane, Hirokazu
    Tsuzuki, Masayuki
    Ueda, Takashi
    Umeda, Masaaki
    Ward, John M
    Watanabe, Yuichiro
    Yazaki, Kazufumi
    Yokoyama, Ryusuke
    Yoshitake, Yoshihiro
    Yotsui, Izumi
    Zachgo, Sabine
    Schmutz, Jeremy
    Insights into Land Plant Evolution Garnered from the Marchantia polymorpha Genome2017Inngår i: Cell, ISSN 0092-8674, E-ISSN 1097-4172, Vol. 171, nr 2, s. 287-304.15Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The evolution of land flora transformed the terrestrial environment. Land plants evolved from an ancestral charophycean alga from which they inherited developmental, biochemical, and cell biological attributes. Additional biochemical and physiological adaptations to land, and a life cycle with an alternation between multicellular haploid and diploid generations that facilitated efficient dispersal of desiccation tolerant spores, evolved in the ancestral land plant. We analyzed the genome of the liverwort Marchantia polymorpha, a member of a basal land plant lineage. Relative to charophycean algae, land plant genomes are characterized by genes encoding novel biochemical pathways, new phytohormone signaling pathways (notably auxin), expanded repertoires of signaling pathways, and increased diversity in some transcription factor families. Compared with other sequenced land plants, M. polymorpha exhibits low genetic redundancy in most regulatory pathways, with this portion of its genome resembling that predicted for the ancestral land plant. PAPERCLIP.

  • 64.
    Breed, Martin F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ottewell, K. M.
    Gardner, M. G.
    Marklund, Maria H. K.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
    Dormontt, E. E.
    Lowe, A. J.
    Mating patterns and pollinator mobility are critical traits in forest fragmentation genetics2015Inngår i: Heredity, ISSN 0018-067X, E-ISSN 1365-2540, Vol. 115, nr 2, s. 108-114Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Most woody plants are animal-pollinated, but the global problem of habitat fragmentation is changing the pollination dynamics. Consequently, the genetic diversity and fitness of the progeny of animal-pollinated woody plants sired in fragmented landscapes tend to decline due to shifts in plant-mating patterns (for example, reduced outcrossing rate, pollen diversity). However, the magnitude of this mating-pattern shift should theoretically be a function of pollinator mobility. We first test this hypothesis by exploring the mating patterns of three ecologically divergent eucalypts sampled across a habitat fragmentation gradient in southern Australia. We demonstrate increased selfing and decreased pollen diversity with increased fragmentation for two small-insect-pollinated eucalypts, but no such relationship for the mobile-bird-pollinated eucalypt. In a meta-analysis, we then show that fragmentation generally does increase selfing rates and decrease pollen diversity, and that more mobile pollinators tended to dampen these mating-pattern shifts. Together, our findings support the premise that variation in pollinator form contributes to the diversity of mating-pattern responses to habitat fragmentation.

  • 65.
    Breed, Martin F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Ottewell, K. M.
    Gardner, M. G.
    Marklund, Maria H. K.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
    Stead, M. G.
    Harris, J. B. C.
    Lowe, A. J.
    Mating system and early viability resistance to habitat fragmentation in a bird-pollinated eucalypt2015Inngår i: Heredity, ISSN 0018-067X, E-ISSN 1365-2540, Vol. 115, nr 2, s. 100-107Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Habitat fragmentation has been shown to disrupt ecosystem processes such as plant-pollinator mutualisms. Consequently, mating patterns in remnant tree populations are expected to shift towards increased inbreeding and reduced pollen diversity, with fitness consequences for future generations. However, mating patterns and phenotypic assessments of open-pollinated progeny have rarely been combined in a single study. Here, we collected seeds from 37 Eucalyptus incrassata trees from contrasting stand densities following recent clearance in a single South Australian population (intact woodland = 12.6 trees ha(-1); isolated pasture = 1.7 trees ha(-1); population area = 10 km(2)). 649 progeny from these trees were genotyped at eight microsatellite loci. We estimated genetic diversity, spatial genetic structure, indirect contemporary pollen flow and mating patterns for adults older than the clearance events and open-pollinated progeny sired post-clearance. A proxy of early stage progeny viability was assessed in a common garden experiment. Density had no impact on mating patterns, adult and progeny genetic diversity or progeny growth, but was associated with increased mean pollen dispersal. Weak spatial genetic structure among adults suggests high historical gene flow. We observed preliminary evidence for inbreeding depression related to stress caused by fungal infection, but which was not associated with density. Higher observed heterozygosities in adults compared with progeny may relate to weak selection on progeny and lifetime-accumulated mortality of inbred adults. E. incrassata appears to be resistant to the negative mating pattern and fitness changes expected within fragmented landscapes. This pattern is likely explained by strong outcrossing and regular long-distance pollen flow.

  • 66.
    Breed, Martin F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Stead, Michael G.
    Australian Centre for Evolutionary Biology and Biodiversity (ACEBB) and School of Earth and Environmental Sciences, University of Adelaide.
    Ottewell, Kym M.
    Australian Centre for Evolutionary Biology and Biodiversity (ACEBB) and School of Earth and Environmental Sciences, University of Adelaide.
    Gardner, Michael G.
    Australian Centre for Evolutionary Biology and Biodiversity (ACEBB) and School of Earth and Environmental Sciences, University of Adelaide.
    Lowe, Andrew J.
    Australian Centre for Evolutionary Biology and Biodiversity (ACEBB) and School of Earth and Environmental Sciences, University of Adelaide.
    Which provenance and where?: Seed sourcing strategies for revegetation in a changing environment2013Inngår i: Conservation Genetics, ISSN 1566-0621, E-ISSN 1572-9737, Vol. 14, nr 1, s. 1-10Artikkel, forskningsoversikt (Fagfellevurdert)
    Abstract [en]

    Revegetation is one practical application of science that should ideally aim to combine ecology with evolution to maximise biodiversity and ecosystem outcomes. The strict use of locally sourced seed in revegetation programs is widespread and is based on the expectation that populations are locally adapted. This practice does not fully integrate two global drivers of ecosystem change and biodiversity loss: habitat fragmentation and climate change. Here, we suggest amendments to existing strategies combined with a review of alternative seed-sourcing strategies that propose to mitigate against these drivers. We present a provenancing selection guide based on confidence surrounding climate change distribution modelling and data on population genetic and/or environmental differences between populations. Revegetation practices will benefit from greater integration of current scientific developments and establishment of more long-term experiments is key to improving the long-term success. The rapid growth in carbon and biodiversity markets creates a favourable economic climate to achieve these outcomes.

  • 67.
    Breed, Martin
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Marklund, Maria H. K.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Limnologi.
    Ottewell, Kym M.
    Gardner, Michael G.
    Harris, J. Berton C.
    Lowe, Andrew J.
    Pollen diversity matters: revealing the neglected effect of pollen diversity on fitness in fragmented landscapes2012Inngår i: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 21, nr 24, s. 5955-5968Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Few studies have documented the impacts of habitat fragmentation on plant mating patterns together with fitness. Yet, these processes require urgent attention to better understand the impact of contemporary landscape change on biodiversity and for guiding native plant genetic resource management. We examined these relationships using the predominantly insect-pollinated Eucalyptus socialis. Progeny were collected from trees located in three increasingly disturbed landscapes in southern Australia and were planted out in common garden experiments. We show that individual mating patterns were increasingly impacted by lower conspecific density caused by habitat fragmentation. We determined that reduced pollen diversity probably has effects over and above those of inbreeding on progeny fitness. This provides an alternative mechanistic explanation for the indirect density dependence often inferred between conspecific density and offspring fitness.

  • 68.
    Brousseau, Louise
    et al.
    INRA, Domaine St Paul, URFM Ecol Forets Mediterraneennes UR629, Site Agroparc CS,Site Agroparc CS 40509, F-84914 Avignon 9, France.;Natl Res Council IBBR CNR, Div Florence, Inst Biosci & BioResources, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, France..
    Postolache, Dragos
    Natl Res Council IBBR CNR, Div Florence, Inst Biosci & BioResources, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, France.;Scuola Super Sant Anna, Piazza Martiri Liberta 33, I-56127 Pisa, Italy.;Natl Inst Forest Res & Dev INCDS, Res Stn Simeria, Str Biscaria 1, Simeria 335900, Romania..
    Lascoux, Martin
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Drouzas, Andreas D.
    Aristotle Univ Thessaloniki, Sch Biol, GR-54124 Thessaloniki, Greece..
    Källman, Thomas
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för medicinsk biokemi och mikrobiologi.
    Leonarduzzi, Cristina
    Natl Res Council IBBR CNR, Div Florence, Inst Biosci & BioResources, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, France.;Natl 3 Res Council Corso Calatafimi, Div Palermo, Inst Biosci & BioResources, Natl Res Council IBBR CNR, I-90129 Palermo, PA, Italy..
    Liepelt, Sascha
    Univ Marburg, Fac Biol, Conservat Biol, Karl von Frisch Str, D-35032 Marburg, Germany..
    Piotti, Andrea
    Natl Res Council IBBR CNR, Div Florence, Inst Biosci & BioResources, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, France..
    Popescu, Flaviu
    Natl Inst Forest Res & Dev INCDS, Res Stn Simeria, Str Biscaria 1, Simeria 335900, Romania..
    Roschanski, Anna M.
    Univ Marburg, Fac Biol, Conservat Biol, Karl von Frisch Str, D-35032 Marburg, Germany.;Leibniz Inst Plant Genet & Crop Plant Res IPK, Genebank Collect North, Inselstr 9, D-23999 Malchow Poel, Germany..
    Zhelev, Peter
    Univ Forestry, 10 Kl Ohridsky Blvd, Sofia 1797, Bulgaria..
    Fady, Bruno
    INRA, Domaine St Paul, URFM Ecol Forets Mediterraneennes UR629, Site Agroparc CS,Site Agroparc CS 40509, F-84914 Avignon 9, France..
    Vendramin, Giovanni Giuseppe
    Natl Res Council IBBR CNR, Div Florence, Inst Biosci & BioResources, Via Madonna Piano 10, I-50019 Sesto Fiorentino, FI, France..
    Local Adaptation in European Firs Assessed through Extensive Sampling across Altitudinal Gradients in Southern Europe2016Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, nr 7, artikkel-id e0158216Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background Local adaptation is a key driver of phenotypic and genetic divergence at loci responsible for adaptive traits variations in forest tree populations. Its experimental assessment requires rigorous sampling strategies such as those involving population pairs replicated across broad spatial scales. Methods A hierarchical Bayesian model of selection (HBM) that explicitly considers both the replication of the environmental contrast and the hierarchical genetic structure among replicated study sites is introduced. Its power was assessed through simulations and compared to classical 'within-site' approaches (FDIST, BAYESCAN) and a simplified, within-site, version of the model introduced here (SBM). Results HBM demonstrates that hierarchical approaches are very powerful to detect replicated patterns of adaptive divergence with low false-discovery (FDR) and false-non-discovery (FNR) rates compared to the analysis of different sites separately through within-site approaches. The hypothesis of local adaptation to altitude was further addressed by analyzing replicated Abies alba population pairs (low and high elevations) across the species' southern distribution range, where the effects of climatic selection are expected to be the strongest. For comparison, a single population pair from the closely related species A. cephalonica was also analyzed. The hierarchical model did not detect any pattern of adaptive divergence to altitude replicated in the different study sites. Instead, idiosyncratic patterns of local adaptation among sites were detected by within-site approaches. Conclusion Hierarchical approaches may miss idiosyncratic patterns of adaptation among sites, and we strongly recommend the use of both hierarchical (multi-site) and classical (within-site) approaches when addressing the question of adaptation across broad spatial scales.

  • 69. Bu, Zhaojun
    et al.
    Chen, Xu
    Rydin, Hakan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Wang, Shengzhong
    Ma, Jinze
    Zeng, Jing
    Performance of four mosses in a reciprocal transplant experiment: implications for peatland succession in NE China2013Inngår i: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 35, s. 220-227Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Sphagnum dominates the moss layer in northern peatlands, but its dominance has decreased while there has been an expansion of other moss genera in some peatlands of NE China since the 1960s. To discover the mechanisms underlying this succession, we performed a four-month reciprocal transplant experiment in Hani Peatland with three Sphagnum species, Sphagnum palustre, S. magellanicum, and S. fuscum and one other moss Polytrichum strictum. Performance of the four mosses and the environmental factors: height above water table (HWT), vascular plant cover and pH, electrical conductivity, base cations, and N and P concentrations in water in the four moss habitats were measured. Biomass production in S. palustre was negatively affected by HWT. Phosphorus had a positive effect on biomass production in S. magellanicum and Polytrichum. None of the environmental factors had any effect on S. fuscum. Overall, the three Sphagnum species deteriorated in P. strictum hummocks, while P. strictum exhibited a wider ecological amplitude and maintained or increased its vigour levels in Sphagnum hummocks. Biomass production in S. palustre and S. magellanicum was negatively affected by P. strictum indicating the competitive ability of P. strictum. Our results suggest that its wide ecological amplitude and competitive ability may explain why P. strictum can expand and replace Sphagnum in some northern peatlands.

  • 70. Bu, Zhao-Jun
    et al.
    Rydin, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Chen, Xu
    Direct and interaction-mediated effects of environmental changes on peatland bryophytes2011Inngår i: Oecologia, ISSN 0029-8549, E-ISSN 1432-1939, Vol. 166, nr 2, s. 555-563Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ecosystem processes of northern peatlands are largely governed by the vitality and species composition in the bryophyte layer, and may be affected by global warming and eutrophication. In a factorial experiment in northeast China, we tested the effects of raised levels of nitrogen (0, 1 and 2 g m(-2) year(-1)), phosphorus (0, 0.1 and 0.2 g m(-2) year(-1)) and temperature (ambient and +3A degrees C) on Polytrichum strictum, Sphagnum magellanicum and S. palustre, to see if the effects could be altered by inter-specific interactions. In all species, growth declined with nitrogen addition and increased with phosphorus addition, but only P. strictum responded to raised temperature with increased production of side-shoots (branching). In Sphagnum, growth and branching changed in the same direction, but in Polytrichum, the two responses were uncoupled: with nitrogen addition there was a decrease in growth (smaller than in Sphagnum) but an increase in branching; with phosphorus addition growth increased but branching was unaffected. There were no two-way interactions among the P, N and T treatments. With increasing temperature, our results indicate that S. palustre should decrease relative to P. strictum (Polytrichum increased its branching and had a negative neighbor effect on S. palustre). With a slight increase in phosphorus availability, the increase in length growth and production of side-shoots in P. strictum and S. magellanicum may give them a competitive superiority over S. palustre. The negative response in Sphagnum to nitrogen could favor the expansion of vascular plants, but P. strictum may endure thanks to its increased branching.

  • 71.
    Bu, Zhao-Jun
    et al.
    NE Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China..
    Sundberg, Sebastian
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution. Swedish Univ Agr Sci, Swedish Species Informat Ctr, POB 7007, SE-75007 Uppsala, Sweden..
    Feng, Lu
    NE Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Chinese Acad Sci, Inst Appl Ecol, Wenhua Rd, Shenyang 110016, Peoples R China..
    Li, Hong-Kai
    NE Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China..
    Zhao, Hong-Yan
    NE Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Jilin Prov Key Lab Wetland Ecol Proc & Environm C, Renmin 5268, Changchun 130024, Peoples R China..
    Li, Hong-Chun
    NE Normal Univ, Inst Peat & Mire Res, State Environm Protect Key Lab Wetland Ecol & Veg, Renmin 5268, Changchun 130024, Peoples R China.;Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan..
    The Methuselah of plant diaspores: Sphagnum spores can survive in nature for centuries2017Inngår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 214, nr 4, s. 1398-1402Artikkel i tidsskrift (Annet vitenskapelig)
  • 72. Bu, Zhao-Jun
    et al.
    Zheng, Xing-Xing
    Rydin, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Moore, Tim
    Ma, Jinze
    Facilitation vs. competition: Does interspecific interaction affect drought responses in Sphagnum?2013Inngår i: Basic and Applied Ecology, ISSN 1439-1791, E-ISSN 1618-0089, Vol. 14, nr 7, s. 574-584Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The stress-gradient hypothesis (SGH) predicts that the relative importance of competition decreases and facilitation increases with an increase in abiotic stress. In peatlands, Sphagnum faces the threat of drought and differentiates into hummock species (drought-tolerant) and hollow species. Whether interspecific interaction affects the influence of drought on bryophyte composition in peatlands is unknown. We established an experiment by simulating drought and building bryophyte communities with two hummock species (S. palustre and S. capillifolium) and one hollow species (S. fallax). In all three species, drought decreased biomass production, height increment and side-shoot production. Sphagnum stores water in the hyaline cells, and leaf hyaline cell percentage (HCP) in the two hummock species increased with drought while no effect was found in S. fallax, suggesting that adjusting HCP is not an effective response to drought for the hollow species. Morphological traits and carbon and nitrogen contents in hummock species responded more to drought than in the hollow species, indicating a rapid response in phenotypic plasticity is an important strategy to resist drought in the hummock species. The presence of neighboring Sphagnum species, rather than drought, decreased carbon content for all three species. All three bryophytes showed interaction between drought and neighbor in two or more plant traits. Our study, however, did not support SGH, and there were no changes from competition under wet to facilitation under dry treatments in any of the six species combinations. On the contrary, when S. fallax was the target species, a change from facilitation under wet to competition under dry treatments was observed. The results suggest that hummock species can facilitate hollow species in wet environments but they could suppress hollow species under drought conditions by competing for water resources. Both drought and strong competition are the probable reasons why hollow species rarely grow in hummocks.

  • 73.
    Burdon, Rosalie
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    The Ecology of Floral Signals in Penstemon digitalis2016Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    In this thesis, I combined field observations and lab experiments to explore the ecological significance of floral signals in a North American wildflower, Penstemon digitalis. More specifically, to determine the potential mechanisms driving selection on floral scent, I studied how scent mediates interactions with pollinators and antagonists by (1) observing spatiotemporal variation in scent emission (2), floral volatile ability to suppress microbes (3) the honest advertisement of nectar, and (4) if scent could aid pollinator learning by reinforcing visual signals.

    Scent sampling of flower development, flower tissues, rewards and inflorescence day/night emission, revealed a complexity in floral scent composition and emission that could reflect several ecological functions. The floral bouquet of P. digitalis was strongest when flowers opened, primarily emitted from flower nectaries and was strongest during the day when pollinators are most active, suggesting a role in plant-pollinator interactions.

    Because linalool was one of the few floral compounds found in nectar where microbe growth can degrade the pollinator reward, I studied its role in plant-microbe interactions. Bacteria strains isolated from floral and vegetative tissues were exposed to varying concentrations of nectar volatiles: linalool and methyl nicotinate. Linalool inhibited bacteria growth rate from all tissue origins whereas methyl nicotinate had little effect, suggesting that microbes could drive selection on linalool emission strength.   

    To determine the extent that linalool could honestly signal nectar availability, linalool-nectar associations were measured for inflorescences and flowers. Linalool predicted inflorescence nectar availability but not flower, exposing a limit to its honesty. Pollinator Bombus impatiens could use linalool as a foraging signal at varying concentrations, suggesting linalool could be learned and used to choose the most rewarding plants.   

    Measurement and comparison of signal-reward associations for both olfactory and visual signals/cues of P. digitalis displays found display size and linalool honest indicators of nectar. Lab behaviour experiments showed multiple signals correlated with reward could increase bumblebee foraging efficiency and promote learning, providing an explanation for why floral displays are complex and consist of multiple signals.   

    Together my results show that an integrated approach is required to understand the mechanisms driving the evolution of the floral phenotype.  

    Delarbeid
    1. Spatiotemporal floral scent variation of Penstemon digitalis
    Åpne denne publikasjonen i ny fane eller vindu >>Spatiotemporal floral scent variation of Penstemon digitalis
    2015 (engelsk)Inngår i: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 41, nr 7, s. 641-650Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Variability in floral volatile emissions can occur temporally through floral development, during diel cycles, as well as spatially within a flower. These spatiotemporal patterns are hypothesized to provide additional information to floral visitors, but they are rarely measured, and their attendant hypotheses are even more rarely tested. In Penstemon digitalis, a plant whose floral scent has been shown to be under strong phenotypic selection for seed fitness, we investigated spatiotemporal variation in floral scent by using dynamic headspace collection, respectively solid-phase microextraction, and analyzed the volatile samples by combined gas chromatography-mass spectrometry. Total volatile emission was greatest during flowering and peak pollinator activity hours, suggesting its importance in mediating ecological interactions. We also detected tissue and reward-specific compounds, consistent with the hypothesis that complexity in floral scent composition reflects several ecological functions. In particular, we found tissue-specific scents for the stigma, stamens, and staminode (a modified sterile stamen common to all Penstemons). Our findings emphasize the dynamic nature of floral scents and highlight a need for greater understanding of ecological and physiological mechanisms driving spatiotemporal patterns in scent production.

    Emneord
    Diel variation, Floral scent, Nectar scent, GC/MS, S-(+)-linalool, Pollen odor, Staminode
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-264677 (URN)10.1007/s10886-015-0599-1 (DOI)000361465800006 ()26133675 (PubMedID)
    Forskningsfinansiär
    The Royal Swedish Academy of Sciences
    Tilgjengelig fra: 2015-10-16 Laget: 2015-10-15 Sist oppdatert: 2017-12-01bibliografisk kontrollert
    2. Floral volatiles suppress Penstemon digitalis microorganisms
    Åpne denne publikasjonen i ny fane eller vindu >>Floral volatiles suppress Penstemon digitalis microorganisms
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-302041 (URN)
    Eksternt samarbeid:
    Tilgjengelig fra: 2016-08-29 Laget: 2016-08-29 Sist oppdatert: 2016-09-07
    3. Honest signalling of nectar scent depends on inflorescence not flower scale
    Åpne denne publikasjonen i ny fane eller vindu >>Honest signalling of nectar scent depends on inflorescence not flower scale
    Vise andre…
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    Emneord
    Pollination, plant-pollinator interactions, protandry, signal evolution, foraging
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-302038 (URN)
    Eksternt samarbeid:
    Tilgjengelig fra: 2016-08-29 Laget: 2016-08-29 Sist oppdatert: 2016-08-29
    4. Multimodal signal honesty in Penstemon digitalis enhances bumblebee foraging
    Åpne denne publikasjonen i ny fane eller vindu >>Multimodal signal honesty in Penstemon digitalis enhances bumblebee foraging
    Vise andre…
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-302043 (URN)
    Eksternt samarbeid:
    Tilgjengelig fra: 2016-08-29 Laget: 2016-08-29 Sist oppdatert: 2016-09-09
  • 74.
    Burdon, Rosalie C. F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Junker, Robert R.
    Scofield, Douglas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Evolutionsbiologi.
    Parachnowitsch, Amy L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Bacteria colonising Penstemon digitalis show volatile and tissue-specific responses to a natural concentration range of the floral volatile linalool2018Inngår i: Chemoecology, ISSN 0937-7409, E-ISSN 1423-0445, Vol. 28, nr 1, s. 11-19Artikkel i tidsskrift (Fagfellevurdert)
  • 75.
    Burdon, Rosalie C. F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Raguso, Robert A.
    Cornell Univ, Dept Neurobiol & Behav, Ithaca, NY 14853 USA..
    Kessler, Andre
    Cornell Univ, Dept Ecol & Evolutionary Biol, Ithaca, NY 14853 USA..
    Parachnowitsch, Amy L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Spatiotemporal floral scent variation of Penstemon digitalis2015Inngår i: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 41, nr 7, s. 641-650Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Variability in floral volatile emissions can occur temporally through floral development, during diel cycles, as well as spatially within a flower. These spatiotemporal patterns are hypothesized to provide additional information to floral visitors, but they are rarely measured, and their attendant hypotheses are even more rarely tested. In Penstemon digitalis, a plant whose floral scent has been shown to be under strong phenotypic selection for seed fitness, we investigated spatiotemporal variation in floral scent by using dynamic headspace collection, respectively solid-phase microextraction, and analyzed the volatile samples by combined gas chromatography-mass spectrometry. Total volatile emission was greatest during flowering and peak pollinator activity hours, suggesting its importance in mediating ecological interactions. We also detected tissue and reward-specific compounds, consistent with the hypothesis that complexity in floral scent composition reflects several ecological functions. In particular, we found tissue-specific scents for the stigma, stamens, and staminode (a modified sterile stamen common to all Penstemons). Our findings emphasize the dynamic nature of floral scents and highlight a need for greater understanding of ecological and physiological mechanisms driving spatiotemporal patterns in scent production.

  • 76.
    Burdon, Rosalie C.F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Junker, Robert R.
    Univ Salzburg, Dept of Organ Biol, Hellbrunnerstr. 34, 5020 Salzburg, Austria.
    Parachnowitsch, Amy L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Floral volatiles suppress Penstemon digitalis microorganismsManuskript (preprint) (Annet vitenskapelig)
  • 77.
    Burdon, Rosalie C.F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Raguso, Robert A.
    Cornell Univ, Dept Neurobiol & Behav, Ithaca, NY 14853 USA..
    Kessler, Andre
    Cornell Univ, Dept Ecol & Evolutionary Biol, Ithaca, NY 14853 USA..
    Gegear, Robert J.
    Worcester Polytechnic Institute, Dept of Biol and Biotech, Worcester, MA, 01609, USA .
    Parachnowitsch, Amy L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Honest signalling of nectar scent depends on inflorescence not flower scaleManuskript (preprint) (Annet vitenskapelig)
  • 78.
    Burdon, Rosalie C.F.
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Scofield, Douglas G.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Evolutionsbiologi.
    Pierce, Ellen
    Worcester Polytechnic Institute, Dept of Biol and Biotech, Worcester, MA, 01609, USA .
    Gegear, Robert J.
    Worcester Polytechnic Institute, Dept of Biol and Biotech, Worcester, MA, 01609, USA .
    Parachnowitsch, Amy L.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Multimodal signal honesty in Penstemon digitalis enhances bumblebee foragingManuskript (preprint) (Annet vitenskapelig)
  • 79.
    Burns, Jean H.
    et al.
    Case Western Reserve Univ, Dept Biol, Cleveland, OH 44106 USA.
    Bennett, Joanne M.
    Martin Luther Univ Halle Wittenberg, Inst Biol, Kirchtor 1, D-06108 Halle, Saale, Germany;Halle Jena Leipzig, German Ctr Integrat Biodivers Res iDiv, Deutsch Pl 5e, D-04103 Leipzig, Germany.
    Li, Junmin
    Taizhou Univ, Zhejiang Prov Key Lab Plant Evolutionary Ecol & C, Taizhou City 318000, Peoples R China;Taizhou Univ, Zhejiang Prov Key Lab Plant Evolutionary Ecol & C, Taizhou 318000, Peoples R China.
    Xia, Jing
    South Cent Univ Nationalities, Coll Life Sci, Wuhan 430074, Hubei, Peoples R China.
    Arceo-Gomez, Gerardo
    East Tennessee State Univ, Dept Biol Sci, Johnson City, TN 37614 USA.
    Burd, Martin
    Monash Univ, Sch Biol Sci, Melbourne, Vic 3800, Australia.
    Burkle, Laura A.
    Montana State Univ, Dept Ecol, Bozeman, MT 59717 USA.
    Durka, Walter
    Halle Jena Leipzig, German Ctr Integrat Biodivers Res iDiv, Deutsch Pl 5e, D-04103 Leipzig, Germany;UFZ Helmholtz Ctr Environm Res, Dept Community Ecol, Theodor Lieser Str 4, D-06120 Halle, Saale, Germany.
    Ellis, Allan G.
    Freitas, Leandro
    Inst Pesquisas Jardim Bot Rio de Janeiro, BR-22460030 Rio De Janeiro, Brazil.
    Rodger, James G.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution. Department of Botany and Zoology, University of Stellenbosch, South Africa;.
    Vamosi, Jana C.
    Univ Calgary, Dept Biol Sci, Calgary, AB T2N 1N4, Canada.
    Wolowski, Marina
    Ashman, Tia-Lynn
    Knight, Tiffany M.
    Martin Luther Univ Halle Wittenberg, Inst Biol, Kirchtor 1, D-06108 Halle, Saale, Germany;Halle Jena Leipzig, German Ctr Integrat Biodivers Res iDiv, Deutsch Pl 5e, D-04103 Leipzig, Germany;UFZ Helmholtz Ctr Environm Res, Dept Community Ecol, Theodor Lieser Str 4, D-06120 Halle, Saale, Germany.
    Steets, Janette A.
    Oklahoma State Univ, Dept Plant Biol Ecol & Evolut, Stillwater, OK 74078 USA.
    Plant traits moderate pollen limitation of introduced and native plants: a phylogenetic meta-analysis of global scale2019Inngår i: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 223, nr 4, s. 2063-2075Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The role of pollination in the success of invasive plants needs to be understood because invasives have substantial effects on species interactions and ecosystem functions. Previous research has shown both that reproduction of invasive plants is often pollen limited and that invasive plants can have high seed production, motivating the questions: How do invasive populations maintain reproductive success in spite of pollen limitation? What species traits moderate pollen limitation for invaders? We conducted a phylogenetic meta-analysis with 68 invasive, 50 introduced noninvasive and 1931 native plant populations, across 1249 species. We found that invasive populations with generalist pollination or pollinator dependence were less pollen limited than natives, but invasives and introduced noninvasives did not differ. Invasive species produced 3x fewer ovules/flower and >250x more flowers per plant, compared with their native relatives. While these traits were negatively correlated, consistent with a tradeoff, this did not differ with invasion status. Invasive plants that produce many flowers and have floral generalisation are able to compensate for or avoid pollen limitation, potentially helping to explain the invaders' reproductive successes.

  • 80.
    Campbell, Charles
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Climatic drivers of Sphagnum species distributionsManuskript (preprint) (Annet vitenskapelig)
  • 81.
    Campbell, Charles
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och genetik, Växtekologi och evolution.
    Sphagnum limits: Physiology, morphology and climate2019Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Sphagnum is the most important plant genus in terms of terrestrial carbon cycling. It and the habitats it creates store an equivalent of ~68% of the CO2 in the atmosphere. The genus has little dispersal limitation and the mire habitats are functionally similar at global scales. Sphagnum species are limited by water deficit at local and biogeographic scales, but this alone is not sufficient to explain local and global scale species patterns. As Sphagnum shoots are long-lived they may be limited by stochastic periods of cold temperature. Within Europe, species are associated with climate gradients along north-south (cold-warm) and oceanic-continental (wet-dry) clines. Within mires, species are sorted along a moisture (hummock-hollow) gradient.

    In this thesis I examined species responses to and recovery from freezing (I). I compared species with different water level niches in traits related to water management of individual shoots and colonies (II). Using distribution modelling of GBIF data, I estimated how different aspects of climate contributed to Sphagnum species distributions in Europe (III). Combining the approaches in papers II and III, I modelled the climatic distributions of the parapatric species S. cuspidatum and S. lindbergii and assessed how traits of water economy varied across the distribution boundary (IV).

    Species responses to winter stress were largely allied to both their hydrological niche and geographic range. Generally, hollow species managed better than hummock species, but species from intermediate positions were less consistent in their response. Species associated with boreal regions were generally less affected than those from temperate regions. Hardening against low temperature was triggered by shorter days and cold nights. Cold temperatures during late autumn may be more important for Sphagnum limits than the minimum temperature during winter.

    Water-related traits split the species into two groups; hollows species with large capitula and hummock species with small capitula. However, inter- and intra-specific trait variation and trait trends along the hydrological gradient were not necessarily the same at the shoot and canopy scale. Some trait correlations were common to all species. Canopy traits, which were emergent traits of colonies of shoots, had the strongest trait associations with the species position along the hummock-hollow gradient.

    At the continental scale the distribution of most Sphagnum species could be successfully modelled by a combination of annual degree days and water balance and the degree of seasonality in these two variables. Individual species distributions were shaped more by the seasonality in degree days than in water balance.

    Across the distributional border of S. cuspidatum and S. lindbergii divergence in the measured traits was mostly seen in the capitula indicating that limits to Sphagnum species are strongly linked to the functioning of the capitulum. Capitulum mass of both species was lower in sympatry than in allopatry, even though the measured values were similar. Canopy traits most strongly separated the species though did not change across the species boundaries.

    In summary, Sphagnum species in general are limited by the availability of water. Low temperature, particularly during late autumn are probably decisive for the biogeographic limits and for the distribution of species along the hydrological gradient.

    Delarbeid
    1. The effects of winter stress on Sphagnum specieswith contrasting macro- and microdistributions
    Åpne denne publikasjonen i ny fane eller vindu >>The effects of winter stress on Sphagnum specieswith contrasting macro- and microdistributions
    2019 (engelsk)Inngår i: Journal of Bryology, ISSN 0373-6687, E-ISSN 1743-2820, Vol. 41, nr 3, s. 205-217Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Introduction: Sphagnum L. forms much of the ground cover in northern peatlands. Different species show affinities for bioclimatic regions in Europe (oceanic/continental; northern/southern) and species-specific tolerance of winter conditions can be a factor explaining their distribution.

    Methods: We focussed on low temperature in a series of experiments and tested (1) the innate ability of a selection of Sphagnum species to tolerate low temperature in relation to their micro-topographic (wetness) and geographical (climate) distribution; (2) the rate of cold tolerance acquisition; and (3) the ability of species to survive a range of low temperature once cold hardened.

    Key results: Our experiments showed that maximal PSII efficiency (Fv/Fm, chlorophyll fluorescence), growth rates and survival were all negatively affected by sub-zero temperatures. Environmental conditions associated with the onset of winter (colder nights and shorter days) triggered the acquisition of cold tolerance in Sphagnum.

    Conclusions: The results were not unequivocal, but species associated with colder climates were generally more tolerant of sub-zero conditions. Species associated with the wettest and driest ends of the wetness gradient were more consistent in their responses than those in between, with wetter-dwelling species being less sensitive to sub-zero temperature than species found in drier microhabitats. Overall, our results suggest that adaptation to winter conditions contribute to the current distribution patterns of Sphagnum species.

     

    sted, utgiver, år, opplag, sider
    Taylor & Francis, 2019
    Emneord
    Chlorophyll fluorescence, cold tolerance, species distribution, Sphagnum, winter
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-387429 (URN)10.1080/03736687.2019.1626167 (DOI)000473871600001 ()
    Forskningsfinansiär
    Swedish Research Council, 2015-05174
    Tilgjengelig fra: 2019-06-24 Laget: 2019-06-24 Sist oppdatert: 2019-10-30bibliografisk kontrollert
    2. Structural traits of Sphagnum: Interrelationships and implications on water economy
    Åpne denne publikasjonen i ny fane eller vindu >>Structural traits of Sphagnum: Interrelationships and implications on water economy
    (engelsk)Manuskript (preprint) (Annet vitenskapelig)
    HSV kategori
    Identifikatorer
    urn:nbn:se:uu:diva-387441 (URN)
    Tilgjengelig fra: 2019-06-24 Laget: 2019-06-24 Sist oppdatert: 2019-06-24