Facilitation displaces hotspots of diversity and allows communities to persist in heavily stressed and disturbed environments
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Zusammenfassung
Question
What are the interacting effects of stress and disturbance on both
competition and facilitation, and ultimately their impact on diversity and species ranges?
Location
Simulated data.
Method
We extended the spatially explicit model of Xiao et al. (Oikos, 118,
2009, 1343) to consider howstress and disturbance – operating alone or together
– affect species distributions through varying biotic interactions.
Results
In the absence of facilitation, species ranges only occurred within the
limits of a triangular zone, which can be considered equivalent to Grime’s C-S-R
triangle. Competitive species were distributed in low stress and disturbance conditions.
Stress- and disturbance-tolerant species occurred in more stressed and
disturbed environments. Species richness followed a hump-shaped relationship
with a hotspot of diversity occurring close to the centre of the C-S-R triangle. In
contrast, facilitation was able to dampen the negative impacts of stress and disturbance acting either solely or simultaneously, but this influence was not simply
the sum of the effects of the processes operating independently on the two
environmental gradients. Facilitation extended species distributions along both
the stress and disturbance gradients and displaced the hotspot of diversity into
the centre of the response surface.
Conclusions
Facilitation was able to promote the occurrence and persistence
of communities in highly stressed and disturbed conditions, i.e. allowing a stable
community to exist beyond the limits of the C-S-R triangle.We also showed that
facilitation can be an important mechanismdriving the displacement of hotspots
of diversity from benign toward intermediate stressed and disturbed environments.
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LE BAGOUSSE-PINGUET, Yoann, Sa XIAO, Rob W. BROOKER, Nicolas GROSS, Pierre LIANCOURT, Dietmar STRAILE, Richard MICHALET, 2014. Facilitation displaces hotspots of diversity and allows communities to persist in heavily stressed and disturbed environments. In: Journal of Vegetation Science. 2014, 25(1), pp. 66-76. ISSN 1100-9233. eISSN 1654-1103. Available under: doi: 10.1111/jvs.12064BibTex
@article{LeBagoussePinguet2014Facil-25927,
year={2014},
doi={10.1111/jvs.12064},
title={Facilitation displaces hotspots of diversity and allows communities to persist in heavily stressed and disturbed environments},
number={1},
volume={25},
issn={1100-9233},
journal={Journal of Vegetation Science},
pages={66--76},
author={Le Bagousse-Pinguet, Yoann and Xiao, Sa and Brooker, Rob W. and Gross, Nicolas and Liancourt, Pierre and Straile, Dietmar and Michalet, Richard}
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<dcterms:abstract xml:lang="eng">Question<br />What are the interacting effects of stress and disturbance on both<br />competition and facilitation, and ultimately their impact on diversity and species ranges?<br /><br /><br />Location<br />Simulated data.<br /><br /><br />Method<br />We extended the spatially explicit model of Xiao et al. (Oikos, 118,<br />2009, 1343) to consider howstress and disturbance – operating alone or together<br />– affect species distributions through varying biotic interactions.<br /><br /><br />Results<br />In the absence of facilitation, species ranges only occurred within the<br />limits of a triangular zone, which can be considered equivalent to Grime’s C-S-R<br />triangle. Competitive species were distributed in low stress and disturbance conditions.<br />Stress- and disturbance-tolerant species occurred in more stressed and<br />disturbed environments. Species richness followed a hump-shaped relationship<br />with a hotspot of diversity occurring close to the centre of the C-S-R triangle. In<br />contrast, facilitation was able to dampen the negative impacts of stress and disturbance acting either solely or simultaneously, but this influence was not simply<br />the sum of the effects of the processes operating independently on the two<br />environmental gradients. Facilitation extended species distributions along both<br />the stress and disturbance gradients and displaced the hotspot of diversity into<br />the centre of the response surface.<br /><br /><br />Conclusions<br />Facilitation was able to promote the occurrence and persistence<br />of communities in highly stressed and disturbed conditions, i.e. allowing a stable<br />community to exist beyond the limits of the C-S-R triangle.We also showed that<br />facilitation can be an important mechanismdriving the displacement of hotspots<br />of diversity from benign toward intermediate stressed and disturbed environments.</dcterms:abstract>
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