Habitat partitioning among three predatory fish in a temperate reservoir

The diversity of predatory species plays a key role in ecosystem functioning but our understanding the mechanisms underlying their coexistence is limited, particularly freshwater ecosystems. Northern pike Esox lucius, European perch Perca fluviatilis and pikeperch Sander lucioperca are three widespread lakes, where they often coexist. As potential competitors, we hypothesised that partitioning habitat determinant coexistence. This was tested by quantifying variability use tracking adult individuals Bariousses reservoir (France, 86.6 ha, mean depth 7.1 m). Specifically, investigated distribution along littoral–pelagic axes daily cycle across seasons. From littoral to pelagic waters were first found pike, then finally pikeperch. Pike closest surface while deepest. general pattern was, however, variable seasons with located upper layer summer during stratification. Individuals more evenly distributed axis closer bottom when water mixing (autumn, winter). In summer, used intensively zone daytime. Other did not show any diel change habitats. Our results highlighted associated among these predators, showing behaviour regarding characteristics. Now than ever, context global which modifies habitats, it crucial importance understand shape