Real-time distribution of pelagic fish: combining hydroacoustics, GIS and spatial modelling at a fine spatial scale

摘要: Understanding spatial distribution of organisms in heterogeneous environment remains one the chief issues ecology. Spatial organization freshwater fish was investigated predominantly on large-scale, neglecting important local conditions and ecological processes. However, small-scale processes are an essential importance for individual habitat preferences hence structuring trophic cascades species coexistence. In this work, we analysed real-time pelagic Řimov Reservoir (Czechia) observed by hydroacoustics relation to environmental predictors during 48 hours at 3-h interval. Effect diurnal cycle revealed highest significance all models with inverse trends between day night general. Our findings highlighted daytime as highly aggregated, general central, deep illuminated areas, whereas nighttime more disperse preferred nearshore steep sloped areas higher depth. This turnover suggests prominent movements significant part assemblage a diel basis. conclusion, hydroacoustics, GIS modelling proved valuable tool predicting elucidate its drivers, which has far reaching implications understanding ecosystem functioning.