Local and regional drivers of taxonomic homogenization in stream communities along a land use gradient
Facteurs locaux et régionaux impliquant l'homogénéisation des communautés de diatomées de rivières le long d'un gradient d'occupation du sol
Résumé
The interaction of land use with local versus regional processes driving biological homogenization (β-diversity loss) is poorly understood. We explored: (a) stream β‐diversity responses to land cover (forest versus agriculture) in terms of physico‐chemistry and physicochemical heterogeneity; (b) whether these responses were constrained by the regional species pool, i.e. γ diversity, or local assembly processes through local (α) diversity; (c) whether local assembly operated through the regional species abundance distribution (SAD) or intraspecific spatial aggregation; and (d) the dependence on body size, dispersal capacity and trophic level (producer versus consumer).
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