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Mapping the imprint of biotic interactions on β-diversity
Marc Ohlmann1, Florent Mazel2, Loïc Chalmandrier3,4
1University Grenoble Alpes, CNRS, Univ. Savoie Mont Blanc, CNRS, LECA, Laboratoire d'Écologie Alpine, F-38000, Grenoble, France.
Ecology Letters
|August 29, 2018
Summary
This study reveals how species interactions shape biodiversity patterns in multi-trophic communities. Fungi play a key role in structuring soil biodiversity across different feeding levels, with significant spatial dependencies observed.
Area of Science:
- Ecology
- Community Ecology
- Biodiversity Science
Background:
- Understanding biodiversity patterns is crucial for ecological research.
- Trophic interactions significantly influence community structure and biodiversity.
- Spatial distribution of species is shaped by biotic and abiotic factors.
Purpose of the Study:
- To develop and validate a statistical method for inferring spatial dependencies between species groups in multi-trophic communities.
- To investigate the role of trophic interactions in structuring beta-diversity across elevational gradients.
- To assess the relative importance of biotic interactions versus environmental factors in shaping soil community structure.
Main Methods:
- Application of a novel statistical method to infer spatial dependencies between species groups.
- Utilizing simulated multi-trophic community data for method validation.
- Analysis of soil multi-trophic communities along an elevational gradient in the French Alps.
Main Results:
- The statistical method successfully approximated biotic interactions in simulated multi-trophic communities.
- Fungi were identified as a major contributor to beta-diversity structuring across trophic groups in alpine soil communities.
- Strong spatial dependencies were observed between specifically interacting groups (e.g., plant-symbiotic fungi, bacteria-nematodes).
- Environmental influence on community structure was found to be less significant than previously reported.
Conclusions:
- The developed method provides a robust approach for analyzing multi-trophic community structure.
- Fungal roles in mediating interactions and structuring biodiversity are significant in soil ecosystems.
- Biotic interactions, particularly between specific trophic groups, are key drivers of spatial biodiversity patterns.
- This research offers new insights into mapping and understanding complex multi-trophic interactions in space and time.
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