Environmental factors prevail over dispersal constraints in determining the distribution and assembly of Trichoptera species in mountain lakes.

摘要: Aiming to elucidate whether large-scale dispersal factors or environmental species sorting prevail in determining patterns of Trichoptera composition mountain lakes, we analyzed the distribution and assembly most common (Plectrocnemia laetabilis, Polycentropus flavomaculatus, Drusus rectus, Annitella pyrenaea, Mystacides azurea) lakes Pyrenees (Spain, France, Andorra) based on a survey 82 covering geographical extremes lake district. Spatial autocorrelation was determined using Moran's eigenvector maps (MEM). Redundancy analysis (RDA) applied explore influence MEM variables in-lake, catchment assemblages. Variance partitioning (partial RDA) revealed fraction variation that could be attributed uniquely either variability variables. Finally, individual relation specific binomial generalized linear models (GLM). assemblages showed spatial structure. However, relevant RDA (i.e., temperature woody vegetation in-lake catchments) were also related with altitude longitude). Partial explained by larger than GLM results longitudinal bias is trend. The dependence found agrees particular traits each species. We conclude are governed predominantly local factors, rather constraints. For boreal similar conditions, strong role capacity has been suggested. Further investigation should address scaling, namely absolute distances constraining steepness gradients at short distances.