Species richness-phosphorus relationships for lakes and streams worldwide

摘要: Aim We investigated the patterns of autotrophic and heterotrophic relative species richness along a total phosphorus (TP) concentration gradient. The richness–TP relationships were calculated separately for four different regions [(sub)tropical, xeric, temperate cold] two types water bodies (lakes streams). Location Global Methods Using data from peer-reviewed articles reporting occurrence freshwater at specific TP concentrations, we determined Using log-logistic regressions, then estimated which potential decrease (RSR) equals 0.5 slope occurs (β). RSR is given as ratio to maximized gradient. Results The streams generally decreased more rapidly than that lakes with increasing P, illustrated by steeper functions (βlakes < βstreams). Although there was no consistent trend between autotrophs heterotrophs in regions, found lower cold (0.04–0.22 mg P/L) warmer (0.28–1.29 mg P/L). Main Conclusions The vary considerably among world, streams) groups (autotrophs heterotrophs). This variability may be attributed differences respect their evolutionary patterns, nutrient demand, biogeochemical hydrological processes. We not able derive regressions all combinations type or region [e.g. (sub)tropical lakes]. For other areas, our results can used assess impact eutrophication on biota.