Diatom beta-diversity in streams increases with spatial scale and decreases with nutrient enrichment across regional to sub-continental scales

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Leboucher , T , Budnick , W R , Passy , S , Boutry , S , Jannoneau , A , Soininen , J , Vyverman , W & Tison-Rosebery , J 2019 , ' Diatom beta-diversity in streams increases with spatial scale and decreases with nutrient enrichment across regional to sub-continental scales ' , Journal of Biogeography , vol. 46 , no. 4 , pp. 734-744 . https://doi.org/10.1111/jbi.13517

Title: Diatom beta-diversity in streams increases with spatial scale and decreases with nutrient enrichment across regional to sub-continental scales
Author: Leboucher, Thibault; Budnick, William R.; Passy, Sophia; Boutry, Sebastien; Jannoneau, Aurelien; Soininen, Janne; Vyverman, Wim; Tison-Rosebery, Juliette
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2019-04
Language: eng
Number of pages: 11
Belongs to series: Journal of Biogeography
ISSN: 0305-0270
URI: http://hdl.handle.net/10138/313830
Abstract: 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.
Subject: beta-diversity
gamma-diversity
community assembly
diatom communities
dispersal processes
landscape windows approach
multi-scale
null model
species sorting
COOCCURRENCE BASED ASSESSMENT
BIOTIC HOMOGENIZATION
PATTERNS
COMMUNITIES
DRIVERS
NICHE
BIODIVERSITY
MECHANISMS
COMPONENTS
TURNOVER
1172 Environmental sciences
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