Weak and variable relationships between environmental severity and small-scale co-occurrence in alpine plant communities

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Serval ID
serval:BIB_2529F8F78FA3
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Weak and variable relationships between environmental severity and small-scale co-occurrence in alpine plant communities
Journal
Journal of Ecology
Author(s)
Dullinger S., Kleinbauer I., Pauli H., Gottfried M., Brooker R., Nagy L., Theurillat J. P., Holten J. I., Abdaladze O., Benito J. L., Borel J. L., Coldea G., Ghosn D., Kanka R., Merzouki A., Klettner C., Moiseev P., Molau U., Reiter K., Rossi G., Stancisi A., Tomaselli M., Unterlugauer P., Vittoz P., Grabherr G.
ISSN
0022-0477
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
95
Number
6
Pages
1284-1295
Language
english
Abstract
1. The stress gradient hypothesis suggests a shift from predominant competition to facilitation along gradients of increasing environmental severity. This shift is proposed to cause parallel changes from prevailing spatial segregation to aggregation among the species within a community. 2. We used 904 1-m2 plots, each subdivided into 100 10 x10 cm, or 25 20 x,,ª20 cm cells, respectively, from 67 European mountain summits grouped into 18 regional altitudinal transects, to test this hypothesized correlation between fine-scale spatial patterns and environmental severity. 3. The data were analysed by first calculating standardized differences between observed and simulated random co-occurrence patterns for each plot. These standardized effect sizes were correlated to indicators of environmental severity by means of linearmixed models. In a factorial design, separate analyses were made for four different indicators of environmental severity (the mean temperature of the coldest month, the temperature sum of the growing season, the altitude above tree line, and the percentage cover of vascular plants in the whole plot), four different species groups (all species, graminoids, herbs, and all growth forms considered as pseudospecies) and at the 10 x 10 cm and 20 x 20 cm grain sizes. 4. The hypothesized trends were generally weak and could only be detected by using the mean temperature of the coldest month or the percentage cover of vascular plants as the indicator of environmental severity. The spatial arrangement of the full species set proved more responsive to changes in severity than that of herbs or graminoids. The expected trends were more pronounced at a grain size of 10 x 10 cm than at 20 x 20 cm. 5. Synthesis In European alpine plant communities the relationships between smallscale co-occurrence patterns of vascular plants and environmental severity are weak and variable. This variation indicates that shifts in net interactions with environmental severity may differ among indicators of severity, growth forms and scales. Recognition of such variation may help to resolve some of the current debate surrounding the stress gradient hypothesis.
Web of science
Open Access
Yes
Create date
20/01/2008 15:33
Last modification date
20/08/2019 13:03
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