Broad-scale patterns of invertebrate richness and community composition in temporary rivers: effects of flow intermittence

摘要: Temporary rivers are increasingly common freshwater ecosystems, but there have been no global syntheses of their community patterns. In this study, we examined the responses aquatic invertebrate communities to flow intermittence in 14 from multiple biogeographic regions covering a wide range and spatial arrangements perennial temporary reaches. Hydrological data were used describe (FI, proportion year without surface water) gradients. Linear mixed-effects models examine relationships between FI structure composition. We also tested if at most sites nested subsets least sites. Taxon richness decreased as increased became dominated by ubiquitous taxa. The number resilient taxa (with high dispersal capacities) with FI, whereas resistant adaptations desiccation) was not related FI. River-specific river-averaged model comparisons indicated FI-community did differ statistically among rivers. Community nestedness along gradients detected little or influence arrangement These results indicate that is primary driver rivers, regardless species pool. largely due resilience rather than resistance mechanisms. However, contrary our expectations, strongly influenced fragmentation patterns, suggesting colonist sources other adjacent reaches important.