Environmental drivers of aquatic macrophyte composition and beta diversity of Southern Amazonian River Basins

Abstract

We investigated the effects of environmental temporality (temporary and permanent aquatic systems) and vegetation type on the beta diversity of aquatic macrophytes across major river basins in southern Amazonia. We analyzed aquatic macrophyte diversity across hierarchical basin scales, partitioning beta diversity into turnover and nestedness components, and related community composition to environmental temporality, vegetation type, and spatial structure. A regional checklist was compiled and classified by vegetation type and hydrographic level across the Tapajós, Xingu, Madeira, Araguaia, and Upper Paraguai basins. Floristic similarity was highest between the Tapajós and Xingu basins (48%) and lowest between Araguaia and all other basins (

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