Outflows from lakes as ecotones - stable conditions maintain macroinvertebrates biodiversity

Outflows from the lakes are rarely considered as an ecotones. The main research direction on invertebrates of lake outflows most often are functional feeding groups, especially filter-feeders as a dominant group in that environment. Our goal was to describe the biodiversity of macroinvertebrates in lake-river ecotones in lowlands of Central Europe, found the environmental factors that shape the biodiversity of that environment and indicate directions for further biodiversity conservation. 40 outflows from lakes with different parameters were selected for the research. During the research, 57 taxa were found at the study sites, of which 32 taxa reached a frequency at least 10 %. The Multiple linear regression showed only one significant relationships between fluvial model and biodiversity. Of the components of this model, only depth of the outflow correlated significantly. There was observed significant differences in the Shannon-Wiener index, which was significantly higher in deeper outflows. Depth of the outflow indirectly affects the preservation of the biodiversity of the ecotone, which results from the greater stability of the water conditions in this place. It should be pay special attention to the water conditions of the catchments in order to minimize water level fluctuations and their negative effect on biodiversity in lake-river ecotones. [Display omitted] •The role of lake outflows in shaping local biodiversity in unknown.•The highest biodiversity was recorded in the deepest outflows.•Due to their taxonomic diversity, outflows can be considered as ecotones.•Deep outflows are characterized by more stable environmental conditions.•To preserve outflows biodiversity, water conditions of the catchment should be care of.