Intraguild predation as a potential explanation for the population decline of the threatened native fish, the European mudminnow (Umbra krameri Walbaum, 1792) by the invasive Amur sleeper (Perccottus glenii Dybowski, 1877)

Graphical representation of the diet composition of Amur sleeper according to the method of Amundsen et al. (1996) during the finer temporal (10-days) sampling. Prey items identified as: Fish (fish); Amp (Amphibia); Col (Coleoptera); Cru (Crustacea); Dip (Diptera); Eph (Ephemeroptera); Gas (Gastropoda); Het (Heteroptera); Hir (Hirudinea); Meg (Megaloptera); Odo (Odonata); Tri (Trichoptera); Uni (unidentified food particles). Date of the sampling occasions as well as the number (n) of the collected specimens (with non-empty stomach) are presented in the lower-right corner. The diagram on the right side represents the temporal scale of the sampling protocol and the ontogenetic development of the European mudminnow (0+).