Diatom β‐diversity in streams increases with spatial scale and decreases with nutrient enrichment across regional to sub‐continental scales
| Autor: | William R. Budnick, Aurélien Jamoneau, Thibault Leboucher, Janne Soininen, Juliette Tison-Rosebery, Wim Vyverman, Sophia I. Passy, Sébastien Boutry |
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| Přispěvatelé: | Department of Geosciences and Geography, University Management |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
gamma-diversity BIOTIC HOMOGENIZATION beta-diversity multi-scale Gamma diversity Beta diversity landscape windows approach Generalist and specialist species 010603 evolutionary biology 01 natural sciences dispersal processes MECHANISMS 03 medical and health sciences DRIVERS COOCCURRENCE BASED ASSESSMENT species sorting 1172 Environmental sciences Ecology Evolution Behavior and Systematics 030304 developmental biology 0303 health sciences Ecology biology Null model null model COMPONENTS NICHE Species sorting respiratory system biology.organism_classification Diatom diatom communities PATTERNS Spatial ecology community assembly Biological dispersal Environmental science BIODIVERSITY TURNOVER COMMUNITIES human activities |
| Zdroj: | Journal of Biogeography. 46:734-744 |
| ISSN: | 1365-2699 0305-0270 |
| Popis: | Aim To quantify the relative contributions of local community assembly processes versus gamma-diversity to beta-diversity, and to assess how spatial scale and anthropogenic disturbance (i.e. nutrient enrichment) interact to dictate which driver dominates. Location France and the United States. Time period 1993-2011. Major taxa studied Freshwater stream diatoms. Methods beta-diversity along a nutrient enrichment gradient was examined across multiple spatial scales. beta-diversity was estimated using multi-site Sorensen dissimilarity. We assessed the relative importance of specialists versus generalists using Friedley coefficient, and the contribution of local community assembly versus gamma-diversity to beta-diversity across spatial scales, with a null model. Finally, we estimated the response of beta-diversity to environmental and spatial factors by testing the correlations between community, environmental and geographical distance matrices with partial Mantel tests. Results beta-diversity generally increased with spatial scale but the rate of increase depended on nutrient enrichment level. beta-diversity decreased significantly with increasing nutrient enrichment level due to the loss of specialist species. Local assembly was an important driver of beta-diversity especially under low nutrient enrichment. Significant partial Mantel correlations were observed between diatom beta-diversity and pure environmental distances under these conditions, highlighting the role of species sorting in local assembly processes. Conversely, in heavily enriched sites, only spatial distances were significantly correlated with beta-diversity, which indicated a substantial role of dispersal processes. Main conclusions Nutrient concentration mediated the expected increase in beta-diversity with spatial scales. Across spatial scales, beta-diversity was more influenced by local assembly processes rather than by gamma-diversity. Nutrient enrichment was associated with an overall decline in diatom beta-diversity and a shift in assembly processes from species sorting to dispersal, notably due to the elimination of some specialists and their subsequent replacement by generalists. |
| Databáze: | OpenAIRE |
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