Abstract
The monkey goby (Neogobius fluviatilis) is one of the Ponto-Caspian species that in recent decades made substantial East-to-West invasions in European inland waters. Now the species is present in the Danube as far as its Slovakian section. In the last decade the species also invaded the Western Bug and Vistula rivers, in the latter it is numerous nearly as far as its delta. The purpose of our study was to define the diet spectrum, feeding preferences, spatial and size related changes in diet and diurnal feeding activity of this goby. Another goal was to predict which groups of native prey would be most affected by the presence of this exotic predator in newly invaded areas. The study was carried out at three sampling locations in the Vistula River system. The food spectrum of the monkey goby was broad. The fish consumed insect larvae and pupae, crustaceans, annelids, gastropods and fish. Chironomid larvae were a prevalent food category in all sampling sites, followed by amphipod crustaceans at one site and by trichopteran larvae and chironomid pupae at another. At the third site, there was no distinct subdominant food category. According to the values of the Ivlev’s selectivity index, the preferred food category were chironomid larvae. No significant differences in diet were found over the 24-h cycle. There was no variation among different fish size groups. From our studies and from the available literature data it can be concluded that the species, due to its ability to use locally available food resources, displays a generalistic and highly flexible feeding strategy.
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Acknowledgments
Thanks are due to our colleagues Lidia Marszał, Grzegorz Zięba, Piotr Spychalski, Marcin Molski for their help in fieldwork, to J. Matthews for linguistic suggestions, as well as to Mirosław Przybylski for his useful comments and suggestions. The study was supported by the internal grant from the University of Lodz.
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Grabowska, J., Grabowski, M. & Kostecka, A. Diet and feeding habits of monkey goby (Neogobius fluviatilis) in a newly invaded area. Biol Invasions 11, 2161–2170 (2009). https://doi.org/10.1007/s10530-009-9499-z
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DOI: https://doi.org/10.1007/s10530-009-9499-z