Journal article

The effects of temperature and dispersal on species diversity in natural microbial metacommunities

  • Parain, Elodie C. University of Fribourg, Department of Biology - Ecology and Evolution, Switzerland - Yale University, Department of Ecology and Evolutionary Biology, Street, New Haven, USA
  • Gray, Sarah M. University of Fribourg, Department of Biology - Ecology and Evolution, Switzerland
  • Bersier, Louis-Félix University of Fribourg, Department of Biology - Ecology and Evolution, Switzerland
    01.12.2019
Published in:
  • Scientific Reports. - 2019, vol. 9, no. 1, p. 18286
English Dispersal is key for maintaining biodiversity at local- and regional scales in metacommunities. However, little is known about the combined effects of dispersal and climate change on biodiversity. Theory predicts that alpha-diversity is maximized at intermediate dispersal rates, resulting in a hump-shaped diversity-dispersal relationship. This relationship is predicted to flatten when competition increases. We anticipate that this same flattening will occur with increased temperature because, in the rising part of the temperature performance curve, interspecific competition is predicted to increase. We explored this question using aquatic communities of Sarracenia purpurea from early- and late-successional stages, in which we simulated four levels of dispersal and four temperature scenarios. With increased dispersal, the hump shape was observed consistently in late successional communities, but only in higher temperature treatments in early succession. Increased temperature did not flatten the hump-shape relationship, but decreased the level of alpha- and gamma- diversity. Interestingly, higher temperatures negatively impacted small-bodied species. These metacommunity-level extinctions likely relaxed interspecific competition, which could explain the absence of flattening of the diversity-dispersal relationship. Our findings suggest that climate change will cause extinctions both at local- and global- scales and emphasize the importance of intermediate levels of dispersal as an insurance for local diversity.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308302
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