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  Identifying population- and community-level mechanisms of diversity-stability relationships in experimental grasslands

Roscher, C., Weigelt, A., Proulx, R., Marquard, E., Schumacher, J., Weisser, W. W., et al. (2011). Identifying population- and community-level mechanisms of diversity-stability relationships in experimental grasslands. Journal of Ecology, 99(6), 1460-1469. doi:10.1111/j.1365-2745.2011.01875.x.

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Roscher, C., Author
Weigelt, A., Author
Proulx, R.1, Author           
Marquard, E., Author
Schumacher, J., Author
Weisser, W. W., Author
Schmid, B., Author
Affiliations:
1Research Group Organismic Biogeochemistry, Dr. C. Wirth, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497764              

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Free keywords: biodiversity covariance plant population and community dynamics population stability synchrony temporal stability annual plant-communities temporal variability ecosystem stability species-diversity statistical inevitability biomass production biodiversity productivity richness density
 Abstract: 1. While positive effects of biodiversity on temporal stability of communities have been demonstrated in theoretical and empirical studies, diversity-stability relationships at the population level remain poorly understood. 2. We investigated temporal variability of plant populations in experimental grassland plots of varying species richness (1, 2, 4, 8, 16-60 species), functional group richness and composition (presence /absence of legumes x grasses x small herbs x tall herbs) in a long-term biodiversity experiment from 2003 to 2009 ('Jena Experiment'). 3. Average population stability, defined as the reciprocal of the coefficient of variation of above-ground biomass production over time, differed largely between species but was generally higher in grasses and small herbs than in legumes and tall herbs. Furthermore, population stability was positively related to a species' proportional contribution to community biomass. Thus, an increasing number of subordinate species explained lower average population stabilities at higher diversity levels. 4. A negative covariance (CV) across all species-richness levels suggested negatively correlated species dynamics. Species belonging to different functional groups fluctuated asynchronously, while species dynamics within functional groups were more synchronous. Community-wide species synchrony decreased with increasing species richness, and temporal stability at the community level increased. 5. Synthesis: Our results suggest that diversity-stability relationships are driven by fluctuations in the population biomass of individual species which are less synchronized in more diverse than in less diverse mixtures and monocultures. Dominant plant species tend to be more stabilized than subdominant species, independently of community species richness. However, asynchrony of population dynamics outweighs decreasing population stability with increasing species richness, resulting in higher temporal stability at the plant community level.

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Language(s): eng - English
 Dates: 2011
 Publication Status: Issued
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.1111/j.1365-2745.2011.01875.x
ISI: ://WOS:000296425000017
Other: BGC1591
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Title: Journal of Ecology
Source Genre: Journal
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Pages: - Volume / Issue: 99 (6) Sequence Number: - Start / End Page: 1460 - 1469 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/954925412868
ISSN: 0022-0477