uu.seUppsala University Publications
Change search
Link to record
Permanent link

Direct link
BETA
Rydin, Håkan
Alternative names
Publications (10 of 124) Show all publications
Lou, Y., Gao, C., Pan, Y., Xue, Z., Liu, Y., Tang, Z., . . . Rydin, H. (2018). Niche modelling of marsh plants based on occurrence and abundance data. Science of the Total Environment, 616-617, 198-207
Open this publication in new window or tab >>Niche modelling of marsh plants based on occurrence and abundance data
Show others...
2018 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 616-617, p. 198-207Article in journal (Refereed) Published
Abstract [en]

The information of species' response (optimum or critical limits along environmental gradients) is a key to understanding ecological questions and to design management plans. A large number of plots (762) from 70 transects of 13 wetland sites in Northeast China were sampled along flooding gradient from marsh to wet meadow. Species response (abundance and occurrence) to flooding were modelled with Generalized Additive Models for 21 dominant plant species. We found that 20 of 21 species showed a significant response to flooding for the occurrence and abundance models, and four types of response were found: monotonically increasing, monotonically decreasing, skewed unimodal and symmetric unimodal. The species with monotonically increasing response have the deepest flooding optimum and widest niche width, followed by those with unimodal curve, and the monotonically decreasing ones have the smallest values. The optima and niche width (whether based on occurrence or abundance models) both significantly correlated with the frequency, but not with mean abundance. Abundance models outperformed occurrence models based on goodness of fit. The abundance models predicted a rather sharp shift from dominance of helophytes (Carex pseudo-curaica and C. lasiocarpa) to wet meadow species (Calamagrostis angustifolia and Carex appendiculata) if water levels drop from about 10 cm above soil surface to below the surface. The defined optima and niche width based on the abundance models can be applied to better instruct restoration management. Given the time required to collect abundance data, an efficient strategy could be to monitor occurrence in many plots and abundance in a subset of these.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keyword
Species response curve, Optimum, Niche width, Distribution, Generalized Additive Models (GAM), Herbaceous marsh
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-346655 (URN)10.1016/j.scitotenv.2017.10.300 (DOI)000424121800020 ()29121575 (PubMedID)
Available from: 2018-03-20 Created: 2018-03-20 Last updated: 2018-03-20Bibliographically approved
Hytteborn, H., Svensson, B. M., Kempe, K., Press, A. & Rydin, H. (2017). Century-long tree population dynamics in a deciduous forest stand in central Sweden. Journal of Vegetation Science, 28(5), 1057-1069
Open this publication in new window or tab >>Century-long tree population dynamics in a deciduous forest stand in central Sweden
Show others...
2017 (English)In: Journal of Vegetation Science, ISSN 1100-9233, E-ISSN 1654-1103, Vol. 28, no 5, p. 1057-1069Article in journal (Refereed) Published
Abstract [en]

Question: We quantify tree dynamics over a century of free development in a small broadleaved forest dominated by Fraxinus excelsior and Ulmus glabra. What are the internal and external factors driving the changes, and how predictable are they? What were the time scale and effects of the spread of Dutch elm disease (DED)? Location: Vårdsätra, eastern central Sweden.

Methods: The survival, growth and recruitment of all trees (≥ 12 cm in girth) were monitored in 1912, 1967, 1988 and 2013 (more often for a part of the forest). Woody species in the field and shrub layers were surveyed in permanent plots in 1976 and 2012. We used transition matrix models to project changes in population sizes and species composition within the century and for 2050.

Results: The results indicate that the forest was in a successional development during the first period. The species composition had stabilised by 1967, except for an expansion of Acer platanoides and the drastic effect of DED that struck the forest around 2000. It took only a decade to kill virtually all large elms in the forest, leading to strong decrease in stem density and basal area. The evidence for effects of DED is still weak, but there has been an increase in saplings, notably of Fraxinus, Prunus padus, Ulmus, and of shoots of Corylus avellana. Several species that are abundant in the vicinity and as seeds fail to establish (Picea abies, Betula spp., Quercus robur, Populus tremula). Projections for 2050 based on the third period (1988-2013) are probably unrealistic since also Fraxinus may disappear because of the recent arrival of the ash dieback.

Conclusions: Slow dynamics in forests that could follow from climate change will locally probably be overruled by unforeseen catastrophes, such as invasions by forest pathogens. These initiate changes with long lag phases difficult to quantify. Still, a dense deciduous forest can resist invasion of colonist species and of regionally dominant conifers; the reason being unfavourable conditions for establishment rather than dispersal limitation

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-325261 (URN)10.1111/jvs.12556 (DOI)000408818000017 ()
Funder
Swedish Research Council
Available from: 2017-06-22 Created: 2017-06-22 Last updated: 2017-12-11Bibliographically approved
Hedwall, P.-O., Brunet, J. & Rydin, H. (2017). Peatland plant communities under global change: negative feedback loops counteract shifts in species composition. Ecology, 98(1), 150-161
Open this publication in new window or tab >>Peatland plant communities under global change: negative feedback loops counteract shifts in species composition
2017 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 98, no 1, p. 150-161Article in journal (Refereed) Published
Abstract [en]

Mires (bogs and fens) are nutrient-limited peatland ecosystems, the vegetation of which is especially sensitive to nitrogen deposition and climate change. The role of mires in the global carbon cycle, and the delivery of different ecosystem services can be considerably altered by changes in the vegetation, which has a strong impact on peat-formation and hydrology. Mire ecosystems are commonly open with limited canopy cover but both nitrogen deposition and increased temperatures may increase the woody vegetation component. It has been predicted that such an increase in tree cover and the associated effects on light and water regimes would cause a positive feed-back loop with respect to the ground vegetation. None of these effects, however, have so far been confirmed in large-scale spatiotemporal studies. Here we analyzed data pertaining to mire vegetation from the Swedish National Forest Inventory collected from permanent sample plots over a period of 20 yr along a latitudinal gradient covering 14 degrees. We hypothesized that the changes would be larger in the southern parts as a result of higher nitrogen deposition and warmer climate. Our results showed an increase in woody vegetation with increases in most ericaceous dwarf-shrubs and in the basal area of trees. These changes were, in contrast to our expectations, evenly distributed over most of the latitudinal gradient. While nitrogen deposition is elevated in the south, the increase in temperatures during recent decades has been larger in the north. Hence, we suggest that different processes in the north and south have produced similar vegetation changes along the latitudinal gradient. There was, however, a sharp increase in compositional change at high deposition, indicating a threshold effect in the response. Instead of a positive feed-back loop caused by the tree layer, an increase in canopy cover reduced the changes in composition of the ground vegetation, whereas a decrease in canopy cover lead to larger changes. Increased natural disturbances of the tree layer due to, for example, pathogens or climate is a predicted outcome of climate change. Hence, these results may have important implications for predictions of long-term effects of increased temperature on peatland vegetation.

Keyword
bog, bryophytes, climate change, conifers, ericoids, forbs, graminoids, mire, nitrogen deposition, peatland, sedges
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-315837 (URN)10.1002/ecy.1627 (DOI)000391862900023 ()28052390 (PubMedID)
Available from: 2017-02-21 Created: 2017-02-21 Last updated: 2017-11-29Bibliographically approved
Moor, H., Rydin, H., Hylander, K., Nilsson, M. B., Lindborg, R. & Norberg, J. (2017). Towards a trait-based ecology of wetland vegetation. Journal of Ecology, 105(6), 1623-1635
Open this publication in new window or tab >>Towards a trait-based ecology of wetland vegetation
Show others...
2017 (English)In: Journal of Ecology, ISSN 0022-0477, E-ISSN 1365-2745, Vol. 105, no 6, p. 1623-1635Article, review/survey (Refereed) Published
Abstract [en]

1. Functional traits mechanistically capture plant responses to environmental gradients as well asplant effects on ecosystem functioning. Yet most trait-based theory stems from terrestrial systemsand extension to other habitats can provide new insights.

2. Wetlands differ from terrestrial systems in conditions (e.g. soil water saturation, anoxia, pHextremes), plant adaptations (e.g. aerenchyma, clonality, ubiquity of bryophytes) and important pro-cesses (e.g. denitrificati on, peat accumulation, methane emission). Wetland plant adaptations andtrait (co-)variation can be situated along major plant trait trade-off axes (e.g. the resource economicsspectrum), but soil saturation represents a complex stress gradient beyond a simple extension ofcommonly studied water availability gradi ents.

3. Traits that affect ecosystem functioning overlap with patterns in terrestrial systems . But wetland-specific traits that mediate plant effects on soil redox conditions, microbial communities and onwater flow, as well as trait spectra of mosses, vary among wetland types.

4. Synthesis. With increasing availability of quantitative plant traits a trait-based ecology of wetlandsis emerging, with the potential to advance process-based understanding and prediction. We providean inte ractive cause-and-effect framework that may guide research efforts to disentangle the multipleinteracti ng processes involved in scaling from environmental conditions to ecosystem functioni ngvia plant communities.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-325257 (URN)10.1111/1365-2745.12734 (DOI)000413341700016 ()
Available from: 2017-06-22 Created: 2017-06-22 Last updated: 2018-03-22Bibliographically approved
Udd, D., Sundberg, S. & Rydin, H. (2016). Multi-species competition experiments with peatland bryophytes. Journal of Vegetation Science, 27(1), 165-175
Open this publication in new window or tab >>Multi-species competition experiments with peatland bryophytes
2016 (English)In: Journal of Vegetation Science, ISSN 1100-9233, E-ISSN 1654-1103, Vol. 27, no 1, p. 165-175Article in journal (Refereed) Published
Abstract [en]

Question

Species interactions are one of the processes determining composition of plant communities. We used the community density series method to study competition in a multi-species community of bryophytes common in calcareous fens. The succession of mires is driven bySphagnum species, which are supposedly superior to brown mosses in competition for resources and space, but little is known about the environmental conditions in which brown mosses can prevail when subject to neighbour interactions. How are interactions among peatland bryophytes affected by the environment?

Location

Field and garden experiments near Uppsala in mid-eastern Sweden.

Methods

To examine the effects of environment on competition and competitive hierarchies we assembled multi-species communities of ten bryophyte species from shoot fragments (brown mosses and Sphagnum species) at two densities and grew them on three types of peat (representing poor, intermediate and rich fens) under dry or wet conditions in a garden experiment and along pH and wetness gradients in the field.

Results

A multivariate analysis of the garden experiment showed that community composition was affected by peat type and wetness and their interactions. The brown mosses performed better in wet and rich fens, the Sphagnum species in drier and poorer fens. The Sphagnumspecies were overall the best competitors.

Conclusions

The experiments demonstrated contrasting responses of brown mosses and Sphagnum to properties of the microhabitat. Sphagnumspecies were generally less affected by competition than the brown mosses. Sphagnum species were competitive in habitats typically dominated by brown mosses and even responded positively to crowding. This can explain why Sphagnum can invade calcareous fens. In contrast, brown mosses performed poorly in habitats more typical of Sphagnum species.

Keyword
Brown mosses, Calcareous fen, Common garden experiment, Density, Field experiment, pH, Relative growth rate (RGR), Sphagnum, Wetness
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-259194 (URN)10.1111/jvs.12322 (DOI)000367816400019 ()
External cooperation:
Funder
Swedish Research Council FormasSwedish Research Council
Available from: 2015-07-29 Created: 2015-07-29 Last updated: 2017-12-04Bibliographically approved
Bengtsson, F., Granath, G. & Rydin, H. (2016). Photosynthesis, growth, and decay traits in Sphagnum – a multispecies comparison. Ecology and Evolution, 6(10), 3325-3341
Open this publication in new window or tab >>Photosynthesis, growth, and decay traits in Sphagnum – a multispecies comparison
2016 (English)In: Ecology and Evolution, ISSN 2045-7758, E-ISSN 2045-7758, Vol. 6, no 10, p. 3325-3341Article in journal (Refereed) Published
Abstract [en]

Peat mosses (Sphagnum) largely govern carbon sequestration in Northern Hemisphere peatlands. We investigated functional traits related to growth and decomposition in Sphagnum species. We tested the importance of environment and phylogeny in driving species traits and investigated trade-offs among them. We selected 15 globally important Sphagnum species, representing four sections (subgenera) and a range of peatland habitats. We measured rates of photosynthesis and decomposition in standard laboratory conditions as measures of innate growth and decay potential, and related this to realized growth, production, and decomposition in their natural habitats. In general, we found support for a trade-off between measures of growth and decomposition. However, the relationships are not strong, with r ranging between 0.24 and 0.45 for different measures of growth versus decomposition. Using photosynthetic rate to predict decomposition in standard conditions yielded R2 = 0.20. Habitat and section (phylogeny) affected the traits and the trade-offs. In a wet year, species from sections Cuspidata and Sphagnum had the highest production, but in a dry year, differences among species, sections, and habitats evened out. Cuspidata species in general produced easily decomposable litter, but their decay in the field was hampered, probably due to near-surface anoxia in their wet habitats. In a principal components analysis, PCA, photosynthetic capacity, production, and laboratory decomposition acted in the same direction. The species were imperfectly clustered according to vegetation type and phylogeny, so that some species clustered with others in the same section, whereas others clustered more clearly with others from similar vegetation types. Our study includes a wider range of species and habitats than previous trait analyses in Sphagnum and shows that while the previously described growth–decay trade-off exists, it is far from perfect. We therefore suggest that our species-specific trait measures offer opportunities for improvements of peatland ecosystem models. Innate qualities measured in laboratory conditions translate differently to field responses. Most dramatically, fast-growing species could only realize their potential in a wet year. The same species decompose fast in laboratory, but their decomposition was more retarded in the field than that of other species. These relationships are crucial for understanding the long-term dynamics of peatland communities.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-284287 (URN)10.1002/ece3.2119 (DOI)000376646700024 ()27103989 (PubMedID)
Funder
Swedish Research CouncilSwedish Research Council FormasThe Royal Swedish Academy of Sciences
Available from: 2016-04-16 Created: 2016-04-16 Last updated: 2017-11-30Bibliographically approved
Johnson, M. G., Granath, G., Tahvanainen, T., Pouliot, R., Stenoien, H. K., Rochefort, L., . . . Shaw, A. J. (2015). Evolution of niche preference in Sphagnum peat mosses. Evolution, 69(1), 90-103
Open this publication in new window or tab >>Evolution of niche preference in Sphagnum peat mosses
Show others...
2015 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 69, no 1, p. 90-103Article in journal (Refereed) Published
Abstract [en]

Peat mosses (Sphagnum) are ecosystem engineersspecies in boreal peatlands simultaneously create and inhabit narrow habitat preferences along two microhabitat gradients: an ionic gradient and a hydrological hummock-hollow gradient. In this article, we demonstrate the connections between microhabitat preference and phylogeny in Sphagnum. Using a dataset of 39 species of Sphagnum, with an 18-locus DNA alignment and an ecological dataset encompassing three large published studies, we tested for phylogenetic signal and within-genus changes in evolutionary rate of eight niche descriptors and two multivariate niche gradients. We find little to no evidence for phylogenetic signal in most component descriptors of the ionic gradient, but interspecific variation along the hummock-hollow gradient shows considerable phylogenetic signal. We find support for a change in the rate of niche evolution within the genusthe hummock-forming subgenus Acutifolia has evolved along the multivariate hummock-hollow gradient faster than the hollow-inhabiting subgenus Cuspidata. Because peat mosses themselves create some of the ecological gradients constituting their own habitats, the classic microtopography of Sphagnum-dominated peatlands is maintained by evolutionary constraints and the biological properties of related Sphagnum species. The patterns of phylogenetic signal observed here will instruct future study on the role of functional traits in peatland growth and reconstruction.

Keyword
Bryophyte, comparative methods, peatland ecology, phylogenetic signal
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-243667 (URN)10.1111/evo.12547 (DOI)000347462800007 ()25319183 (PubMedID)
Available from: 2015-02-20 Created: 2015-02-11 Last updated: 2017-12-04Bibliographically approved
Udd, D., Mälson, K., Sundberg, S. & Rydin, H. (2015). Explaining species distributions by traits in bryophytes and vascular plants in a patchy landscape. Folia Geobotanica, 50(2), 161-174
Open this publication in new window or tab >>Explaining species distributions by traits in bryophytes and vascular plants in a patchy landscape
2015 (English)In: Folia Geobotanica, ISSN 1211-9520, E-ISSN 1874-9348, Vol. 50, no 2, p. 161-174Article in journal (Refereed) Published
Abstract [en]

The species pool theory helps us understand species distributions at different geographical scales. In theory, species pools consist of species passing the filters between different geographical scales. Filters of dispersal and environment act between the regional and local pools, while filters of biotic interactions act between the local and the community pools. We studied bryophytes and vascular plants restricted to rich (calcareous) fens that occur as patches in a forested landscape. We then examined their frequencies and abundances at the local and regional scales and related the results to traits important for dispersal and competition. Our results show that weft-forming bryophytes and vascular plants with far-creeping rhizomes have higher local frequency than predicted from their regional frequency. Dispersal traits did not explain any variation in the distributions. This indicates that environmental and biotic filters are more important than dispersal limitation at the regional scale, and that clonal expansion is the most important factor for high frequency and abundance at the local scale in these nutrient poor habitats.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-259193 (URN)10.1007/s12224-015-9219-7 (DOI)000358921400006 ()
Funder
Swedish Research Council FormasSwedish Environmental Protection Agency
Available from: 2015-07-29 Created: 2015-07-29 Last updated: 2017-12-04Bibliographically approved
Lou, Y., Zhao, K., Wang, G., Jiang, M., Lu, X. & Rydin, H. (2015). Long-term changes in marsh vegetation in Sanjiang Plain, northeast China. Journal of Vegetation Science, 26(4), 643-650
Open this publication in new window or tab >>Long-term changes in marsh vegetation in Sanjiang Plain, northeast China
Show others...
2015 (English)In: Journal of Vegetation Science, ISSN 1100-9233, E-ISSN 1654-1103, Vol. 26, no 4, p. 643-650Article in journal (Refereed) Published
Abstract [en]

QuestionsIs there a consistent change in species composition and species richness across the communities along the wetness zonation? Which species are sensitive to environmental changes? Has species richness increased or decreased? What are the relative effects of climate, geographical position and local environmental factors on the inland marsh community? LocationSanjiang Plain, northeast China (130-133 degrees E, 45-48 degrees N). MethodsA total of 94 plots were re-surveyed in 2012 and compared with data from 1973. Detrended correspondence analysis (DCA) and indicator species analysis were used to analyse the direction and nature of change in community composition between 1973 and 2012. Paired t-test was used to test for change in species richness, water level and soil variables between the two surveys. Correlation and step-wise regression analyses were used to test the relationship between vegetation change (species richness and DCA scores), environmental variables and geographic position. ResultsVegetation has changed towards a drier state, with the greatest changes in the wettest Carex lasiocarpa community and the smallest changes in the driest Calamagrostis angustifolia community. The frequency and cover of hygrophilous species and species typical of oligotrophic wetlands decreased, while grasses and other non-marsh species increased. Species richness per community and per plot increased over time. The dynamics within each community was only weakly correlated with biogeographic predictors: longitude, latitude, elevation and annual precipitation. ConclusionsHydrology was the main factor controlling changes along the marsh zonation, and was most likely in response to climate warming and land-use changes. The different responses among the marsh communities along the zonation and between hydrophytes and other species imply that future protection and management need to be based on community type and plant functional types.

Keyword
Environment changes, Herbaceous marsh, Permanent plots, Species diversity, Water level, Wetlands
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-258323 (URN)10.1111/jvs.12270 (DOI)000356811300005 ()
Available from: 2015-07-15 Created: 2015-07-13 Last updated: 2017-12-04Bibliographically approved
Osorio-Zuniga, F., Fonturbel, F. E. & Rydin, H. (2014). Evidence of mutualistic synzoochory between cryptogams and hummingbirds. Oikos, 123(5), 553-558
Open this publication in new window or tab >>Evidence of mutualistic synzoochory between cryptogams and hummingbirds
2014 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 123, no 5, p. 553-558Article in journal (Refereed) Published
Abstract [en]

Endozoochory is usually involved in seed dispersal mutualisms, whereas ectozoochory is non-rewarding, and therefore neutral (or even negative) for the animal vector. Synzoochory is an intermediate dispersal type between endo and ectozoochory in which propagules are deliberately transported (usually in the mouth) but with no ingestion or gut passage involved. We present empirical evidence of synzoochoric mutualism between the hummingbird Sephanoides sephaniodes and cryptogams (one fern and seven moss species). Two species (Lophosoria quadripinnata and Ancistrodes genuflexa) constituted the bulk of nest biomass, and another six moss species were present in lesser quantity. The hummingbird was selective when collecting nest material so that the nests contained a higher density of reproductive structures (that could be dispersed further) than natural patches of the cryptogam species. Even after one year, the nests maintained half of the original reproductive structures (sporangia, sporophytes) and biomass, constituting an important dispersal source. These results show a new type of mutualism in which mosses could be dispersed throughout longer distances (several km) by hummingbirds and to higher positions (particularly for ground-living species, promoting dispersal potential). The hummingbird benefits from collecting cryptogam material for nest building, and cryptogams benefit from the concentration and relocation of diaspore sources into more effective recruiting sites. Similar mutualistic relationships could be a general phenomenon, of importance in many ecosystems.

National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-224720 (URN)10.1111/j.1600-0706.2013.01027.x (DOI)000334646100005 ()
Available from: 2014-05-23 Created: 2014-05-19 Last updated: 2017-12-05Bibliographically approved
Organisations

Search in DiVA

Show all publications