Journal
JOURNAL OF LIMNOLOGY
Volume 81, Issue 1, Pages -Publisher
PAGEPRESS PUBL
DOI: 10.4081/jlimnol.2022.2059
Keywords
Spatiotemporal changes; littoral zone; Wloclawek Reservoir; native fish species; alien invasive Ponto-Caspian gobiids
Categories
Funding
- University of Warmia and Mazury in Olsztyn [11.610.015110]
- program entitled Regional Initiative of Excellence for the years 2019-2022 [010/RID/2018/19]
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The study examined the daily and seasonal dynamics of changes in fish communities in two environmentally different littoral zones of the Wloclawek Reservoir. Results showed the domination of native fish species in catches and the varying presence of alien invasive gobies throughout the season.
The aim of the study was to examine the daily and seasonal dynamics of changes in fish communities in two environmentally different littoral zones of the Wloclawek Reservoir (central Poland), i.e., the floodplain (limnic Dobiegniewo site) and lotic area (Murzynowo site). During seasonal catches using trawl nets, in the daily cycle (at 00.00, 06.00, 12.00, and 18.00 hours), the presence of 18 fish species representing 4 families (Cyprinidae, Percidae, Gasterosteidae, Gobiidae) was confirmed. In both localities, the domination of native taxa, such as roach Rutilus rutilus (L.) and Eurasian perch Perca fluviatilis L., in Dobiegniewo (26.6 and 26.6%, respectively) and Murzynowo (13.6 and 22.7%, respectively) of all caught specimens was noted. The quantitative share of three alien invasive gobies, racer goby Neogobius gymnotrachelus (Kessler, 1857), monkey goby Neogobius fluviatilis (Pallas, 1814), and western tubenose goby Proterorhinus semilunaris (Heckel, 1837), varied in the range between 2.7 and 35.3% in samples throughout the season. The results indicate the significant role of gobies in the structure of the sublittoral fish communities of Wloclawek Reservoir and the necessity of expansion process studies, as well as the observation of the interactions with native fish species in invaded areas.
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