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BETA
Svensson, Brita
Alternative names
Publications (10 of 29) Show all publications
Svensson, B. M., Carlsson, B. Å. & Melillo, J. M. (2018). Changes in species abundance after seven years of elevated atmospheric CO2 and warming in a Subarctic birch forest understorey, as modified by rodent and moth outbreaks. PeerJ, 6, Article ID e4843.
Open this publication in new window or tab >>Changes in species abundance after seven years of elevated atmospheric CO2 and warming in a Subarctic birch forest understorey, as modified by rodent and moth outbreaks
2018 (English)In: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 6, article id e4843Article in journal (Refereed) Published
Abstract [en]

A seven-year long, two-factorial experiment using elevated temperatures (5 degrees C) and CO2 (concentration doubled compared to ambient conditions) designed to test the effects of global climate change on plant community composition was set up in a Subarctic ecosystem in northernmost Sweden. Using point-frequency analyses in permanent plots, an increased abundance of the deciduous Vaccinium myrtillus, the evergreens V. vitis-idaea and Empetrum nigrum ssp. hermaphroditum and the grass Avenella flexuosa was found in plots with elevated temperatures. We also observed a possibly transient community shift in the warmed plots, from the vegetation being dominated by the deciduous V. myrtillus to the evergreen V. vitis-idaea. This happened as a combined effect of V. myrtillus being heavily grazed during two events of herbivore attack-one vole outbreak (Clethrionomys rufocanus) followed by a more severe moth (.Epirrita autumnata) outbreak that lasted for two growing seasons-producing a window of opportunity for V. vitis-idaea to utilize the extra light available as the abundance of V. myrtillus decreased, while at the same time benefitting from the increased growth in the warmed plots. Even though the effect of the herbivore attacks did not differ between treatments they may have obscured any additional treatment effects. This long-term study highlights that also the effects of stochastic herbivory events need to be accounted for when predicting future plant community changes.

Place, publisher, year, edition, pages
PEERJ INC, 2018
Keywords
Clethrionomys rufocanus, Epirrita autumnata, Herbivory, Open-top chambers, Pointfrequency analysis, Vaccinium myrtillus, Vaccinium vitis-idaea
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-357735 (URN)10.7717/peerj.4843 (DOI)000434233600005 ()29868267 (PubMedID)
Funder
Swedish Environmental Protection Agency
Available from: 2018-08-31 Created: 2018-08-31 Last updated: 2018-08-31Bibliographically approved
Millett, J., Foot, G. W., Thompson, J. C. & Svensson, B. (2018). Geographic variation in Sundew (Drosera) leaf colour: plant-plant interactions counteract expected effects of abiotic factors. Journal of Biogeography, 45(3), 582-592
Open this publication in new window or tab >>Geographic variation in Sundew (Drosera) leaf colour: plant-plant interactions counteract expected effects of abiotic factors
2018 (English)In: Journal of Biogeography, ISSN 0305-0270, E-ISSN 1365-2699, Vol. 45, no 3, p. 582-592Article in journal (Refereed) Published
Abstract [en]

Aim: To identify geographic patterns in leaf colour of roundleaved sundew (Drosera rotundifolia) growing on ombrotrophic (rain fed) bogs across Europe and establish the controls over these patterns. Location: North-west Europe. Taxon: Angiosperms, Drosera rotundifolia. Methods: We measured leaf colour of D. rotundifolia plants growing on 24 ombrotrophic bogs across north-west Europe covering 26.4 degrees of longitude and 21.1 degrees of latitude. We measured the height and cover of co-occurring vascular plant vegetation and the amount of incident light intercepted by the vegetation canopy. We determined the role of abiotic variables in controlling the patterns found. In a separate experimental study, we manipulated plant-plant interactions with D. rotundifolia by removing aboveground vascular plant vegetation and monitoring leaf colour over a single summer. Results: Drosera rotundifolia leaf colour varied between bogs. Leaves were redder in northern latitudes and eastern longitudes, and in sites/plots with lower canopy influence, lower nutrient deposition, and a more continental climate. Canopy influence was greater on sites in southern latitudes, eastern longitudes, and with higher nutrient deposition, longer growing seasons and a more maritime climate. Nutrient deposition was higher at more southerly latitudes, eastern sites had a more continental climate, and southern and western sites had warmer and longer growing seasons. In the insitu experiment, leaves became more red when canopy light transmission was increased by removing vegetation, but not when shade net was subsequently added to reduce light transmission. Main Conclusion: Geographic variation in Drosera rotundifolia leaf colour is strongly affected by its light environment, mediated by plant-plant interactions, but leaf colour is also affected by other abiotic factors. The relative importance of biotic and abiotic factors in determining geographic patterns in traits, and also species responses to environmental change, might depend on the growth form and competitive ability of a species.

Place, publisher, year, edition, pages
WILEY, 2018
Keywords
anthocyanin, Drosera, environmental gradients, leaf colour, light, nutrients, plant-plant interactions, sundew, trait variation
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-350491 (URN)10.1111/jbi.13141 (DOI)000426508900006 ()
Available from: 2018-05-17 Created: 2018-05-17 Last updated: 2018-05-17Bibliographically approved
Sandström, A., Svensson, B. M. & Milberg, P. (2017). An example of how to build conservation evidence from case studies: Fire and raking to enhance Pulsatilla vernalis populations. Journal for Nature Conservation, 36, 58-64
Open this publication in new window or tab >>An example of how to build conservation evidence from case studies: Fire and raking to enhance Pulsatilla vernalis populations
2017 (English)In: Journal for Nature Conservation, ISSN 1617-1381, E-ISSN 1618-1093, Vol. 36, p. 58-64Article in journal (Refereed) Published
Abstract [en]

Can data collected by practitioners during practical conservation work be used as decision support? To find out, we used unpublished data from attempts to enhance populations of the vascular plant Pulsatilla vernalis in Sweden. About half of the 50 located cases had generated data useful for meta-analysis. We could show that burning had a positive effect while mechanical disturbance had negligible effects on number of plants in short-term follow-ups. Furthermore, we suggest that follow-up variables related to flowering are inferior for monitoring intervention success as flowering varies greatly between years. In the broader context, our example shows that simple records from practical conservation work can be a rich source of information. It was also obvious that there is great potential for more useful evidence by making just small improvements in field protocols, documentation, and archiving. Finally, we suggest that biologists and researchers need to develop an appreciation of "different levels of evidence", and that in circumstances where we lack relevant experiments or observational studies, case studies might be useful for improving interventions. (C) 2017 Elsevier GmbH. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER GMBH, URBAN & FISCHER VERLAG, 2017
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-323659 (URN)10.1016/j.jnc.2017.02.005 (DOI)000400593400008 ()
Available from: 2017-06-20 Created: 2017-06-20 Last updated: 2017-06-20Bibliographically 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
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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: 2019-02-01Bibliographically approved
Millett, J., Foot, G. W. & Svensson, B. M. (2015). Nitrogen deposition and prey nitrogen uptake control the nutrition of the carnivorous plant Drosera rotundifolia. Science of the Total Environment, 512, 631-636
Open this publication in new window or tab >>Nitrogen deposition and prey nitrogen uptake control the nutrition of the carnivorous plant Drosera rotundifolia
2015 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 512, p. 631-636Article in journal (Refereed) Published
Abstract [en]

Nitrogen (N) deposition has important negative impacts on natural and semi-natural ecosystems, impacting on biotic interactions across trophic levels. Low-nutrient systems are particularly sensitive to changes in N inputs and are therefore more vulnerable to N deposition. Carnivorous plants are often part of these ecosystems partly because of the additional nutrients obtained from prey. We studied the impact of N deposition on the nutrition of the carnivorous plant Drosera rotundifolia growing on 16 ombrotrophic bogs across Europe. We measured tissue N, phosphorus (P) and potassium (K) concentrations and prey and root N uptake using a natural abundance stable isotope approach. Our aim was to test the impact of N deposition on D. rotundifolia prey and root N uptake, and nutrient stoichiometry. D. rotundifolia root N uptake was strongly affected by N deposition, possibly resulting in reduced N limitation. The contribution of prey N to the N contained in D. rotundifolia ranged from 20 to 60%. N deposition reduced the maximum amount of N derived from prey, but this varied below this maximum. D. rotundifolia tissue N concentrations were a product of both root N availability and prey N uptake. Increased prey N uptake was correlated with increased tissue P concentrations indicating uptake of P from prey. N deposition therefore reduced the strength of a carnivorous plant prey interaction, resulting in a reduction in nutrient transfer between trophic levels. We suggest that N deposition has a negative impact on D. rotundifolia and that responses to N deposition might be strongly site specific.

Keywords
Atmospheric nitrogen deposition, Carnivorous plants, Drosera rotundifolia, Plant-insect interactions, Round-leaved sundew, Stable isotopes
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-258810 (URN)10.1016/j.scitotenv.2015.01.067 (DOI)000351248500062 ()25655989 (PubMedID)
Available from: 2015-07-23 Created: 2015-07-20 Last updated: 2017-12-04Bibliographically approved
Svensson, B. M., Rydin, H. & Carlsson, B. Å. (2013). Clonality in the plant community (2ed.). In: Eddy van der Maarel & Janet Franklin (Ed.), Vegetation ecology: (pp. 141-163). Wiley-Blackwell
Open this publication in new window or tab >>Clonality in the plant community
2013 (English)In: Vegetation ecology / [ed] Eddy van der Maarel & Janet Franklin, Wiley-Blackwell, 2013, 2, p. 141-163Chapter in book (Refereed)
Place, publisher, year, edition, pages
Wiley-Blackwell, 2013 Edition: 2
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-210876 (URN)9781444338881 (ISBN)
Available from: 2013-11-15 Created: 2013-11-15 Last updated: 2019-02-01Bibliographically approved
Svensson, B. M. (2013). Från vägkant till ängsvägkant - är det möjligt?: en litteraturgenomgång. Uppsala: Centrum för biologisk mångfald
Open this publication in new window or tab >>Från vägkant till ängsvägkant - är det möjligt?: en litteraturgenomgång
2013 (Swedish)Report (Refereed)
Abstract [sv]

Artrikedomen verkar minska i våra vägkanter, trots att de utgör potentiellt viktiga miljöer för många arter. En orsak till denna minskning kan vara att det avslagna materialet ligger kvar efter slåttern och göder marken. Konkurrensstarka och näringskrävande arter gynnas, vilket försvårar överlevnaden för de konkurrenssvaga och småväxta arterna. Med syftet att förstå hur vägkantsskötsel bör utföras gjorde jag en litteraturgenomgång av cirka 400 vetenskapliga artiklar i ämnet. Systematiska undersökningar av vägkantsvegetation saknas nästan helt. Denna litteraturgenomgång har därför fokuserat på artiklar om öppna gräsmarker och resultaten har använts för att utvärdera olika typer av vägkantsskötsel. Resultaten visar att om produktionen av biomassa hålls nere och ljusinsläppet ökar kan den biologiska mångfalden i gynnas. Slåtter och bortförsel av det slagna materialet är positivt för artrikedomen, oavsett hur näringsrik marken är. Roterande kedjor eller skärande redskap verkar spela mindre roll, så länge det slagna materialet samlas upp. En varierad skötsel, anpassad till vägkanternas behov är i många fall fördelaktig om man vill gynna ett större antal arter, eftersom olika arter har olika behov. Intensivare skötsel med uppsamling kan koncentreras till de vägkanter där sådan skötsel har störst effekt. När och hur ofta en vägkant ska slås bör bestämmas utifrån vägkantens vegetation och syftet med slåttern. Utifrån litteraturgenomgångens resultat rekommenderar jag att uppsamling av det slagna materialet bör tillämpas, oavsett slåttermetod. Detta är speciellt viktigt i näringsrika vägkanter. Man bör även så långt det är möjligt återgå till att använda skärande slåtteraggregat så att en varierad slåtter lättare kan utföras.

Place, publisher, year, edition, pages
Uppsala: Centrum för biologisk mångfald, 2013. p. 48
Series
CBM:s skriftserie, ISSN 1403-6568 ; 76
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-210880 (URN)
Available from: 2013-11-15 Created: 2013-11-15 Last updated: 2015-06-30Bibliographically approved
Svensson, B. M. & Carlsson, B. Å. (2013). Hur ska vi bevara tidigblommande ögontröster i de gotländska ängena? [Protecting early-flowering Euphrasia on Gotland, southeast Sweden.]. Svensk Botanisk Tidskrift, 107(1), 42-51
Open this publication in new window or tab >>Hur ska vi bevara tidigblommande ögontröster i de gotländska ängena? [Protecting early-flowering Euphrasia on Gotland, southeast Sweden.]
2013 (Swedish)In: Svensk Botanisk Tidskrift, ISSN 0039-646X, Vol. 107, no 1, p. 42-51Article in journal (Other (popular science, discussion, etc.)) Published
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-213719 (URN)
Available from: 2014-01-03 Created: 2014-01-03 Last updated: 2017-12-06Bibliographically approved
Hedenås, H., Carlsson, B. Å., Emanuelsson, U., Headley, A. D., Jonasson, C., Svensson, B. M. & Callaghan, T. V. (2012). Changes Versus Homeostasis in Alpine and Sub-Alpine Vegetation Over Three Decades in the Sub-Arctic. Ambio, 41(Suppl 3), 187-196
Open this publication in new window or tab >>Changes Versus Homeostasis in Alpine and Sub-Alpine Vegetation Over Three Decades in the Sub-Arctic
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2012 (English)In: Ambio, ISSN 0044-7447, E-ISSN 1654-7209, Vol. 41, no Suppl 3, p. 187-196Article in journal (Refereed) Published
Abstract [en]

Plant species distributions are expected to shift and diversity is expected to decline as a result of global climate change, particularly in the Arctic where climate warming is amplified. We have recorded the changes in richness and abundance of vascular plants at Abisko, sub-Arctic Sweden, by re-sampling five studies consisting of seven datasets; one in the mountain birch forest and six at open sites. The oldest study was initiated in 1977-1979 and the latest in 1992. Total species number increased at all sites except for the birch forest site where richness decreased. We found no general pattern in how composition of vascular plants has changed over time. Three species, Calamagrostis lapponica, Carex vaginata and Salix reticulata, showed an overall increase in cover/frequency, while two Equisetum taxa decreased. Instead, we showed that the magnitude and direction of changes in species richness and composition differ among sites.

Keywords
Ecosystem structure, Heaths, Meadows, Mountain birch forest, Plant biodiversity, Plant community ecology
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-181139 (URN)10.1007/s13280-012-0312-3 (DOI)000307285200003 ()
Available from: 2012-09-18 Created: 2012-09-17 Last updated: 2017-12-07Bibliographically approved
Svensson, B. M. & Carlsson, B. Å. (2012). Hur ska vi bevara tidigblommande ögontröster i de gotländska ängena?. Svensk Botanisk Tidskrift, 107(1), 42-51
Open this publication in new window or tab >>Hur ska vi bevara tidigblommande ögontröster i de gotländska ängena?
2012 (Swedish)In: Svensk Botanisk Tidskrift, ISSN 0039-646X, Vol. 107, no 1, p. 42-51Article in journal (Refereed) Published
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-210879 (URN)
Available from: 2013-11-15 Created: 2013-11-15 Last updated: 2017-12-06Bibliographically approved
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