0447101 - ÚBO 2016 RIV CZ eng J - Journal Article
Všetičková, Lucie - Janáč, Michal - Roche, Kevin Francis - Jurajda, Pavel
Assessment of possible diel and sex-related differences in round goby (Neogobius melanostomus) diet.
Folia zoologica. Roč. 64, č. 2 (2015), s. 104-111. ISSN 0139-7893. E-ISSN 1573-1189
R&D Projects: GA ČR(CZ) GAP505/11/1768
Institutional support: RVO:68081766
Keywords : invasive species * diel feeding * inter-sex differences * nest-guarding * breeding season
Subject RIV: EG - Zoology
Impact factor: 0.592, year: 2015

Several aspects of invasive round goby (Neogobius melanostomus) biology are based on sporadic observations or anecdotal reports only, e.g. they are night feeders, they prey on eggs and larvae of native fish and male feeding ceases or is highly restricted during breeding due to nest-guarding. To test the general validity of such hypotheses, we assessed diel and inter-sex differences in diet and feeding intensity of 232 gobies (144 female [54 day:90 night] and 88 male [39 day:49 night]) caught during the breeding season. Gobies took primarily aquatic insect larvae and did not predate on eggs, larvae or juveniles of native fish. Unlike previous studies, we observed no diel difference in feeding intensity or diet composition; hence no universal diel pattern can be implied for round goby feeding. On the other hand, we observed significant inter-sex differences in both feeding intensity and diet composition, with males consuming less food than females, presumably due to restricted feeding activity during nest-guarding. Inter-sex shifts in both diet composition and amount of food were less than expected, however, suggesting that, under most conditions, there is no reason to expect a fatal decrease in male energy intake, as suggested by some earlier studies.
Permanent Link: http://hdl.handle.net/11104/0249039