Dynamics of the habitat use of three predatory freshwater fish in a lentic ecosystem
Riha, M.; Rabaneda-Bueno, R.; Jaric, I.; Souza, A. T.; Vejrik, L.; Drastik, V.; Blabolil, P.; Holubova, M.; Juza, T.; Gjelland, K.; Rychtecky, P.; Sajdlova, Z.; Kocvara, L.; Tuser, M.; Prchalova, M.; Seda, J.; Peterka, J.
Show abstract
To understand the conditions of coexistence in multiple-species predator community, we studied longitudinal and vertical movement of pike (Esox lucius), pikeperch (Sander lucioperca) and catfish (Silurus glanis) in the [R]imov Reservoir, using an autonomous telemetry system for 11 months. We found significant differences among these three species in movement and depth that varied considerably in time, with the greatest differences between warm (late spring and early autumn) and cold season (late autumn to early spring). Preference for different sections of the reservoir was stable for pike, while pikeperch and catfish frequently visited tributary during the warm season, and moved closer to the dam during the cold season. Pike longitudinal activity was highest in the cold season, pikeperch in the warm season, and catfish activity peaked in both the warm and cold seasons. Overlap in the depth used among species was higher in the warm season, when all species used the upper layer of the water column, and lower in cold season, when pikeperch and catfish used deeper areas. These results demonstrated ability of predators to actively inspect a large portion of the reservoir in both longitudinal and vertical dimensions, although differing in the timing of their habitat use and activity.
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