20.500.12556/DiRROS-19402 Small but voracious invasive generalist consumes more zooplankton in winter than native planktivore In recent years, Lake Constance has experienced an invasion and domination of three-spined stickleback (Gasterosteus aculeatus) in the pelagic zone, which has coincided with a decline in the native whitefish (Coregonus wartmanni) population. Similar massive invasions of sticklebacks into pelagic zones have been recognized also in marine areas or small lakes worldwide. However, their diet overlaps with native species is rarely evaluated, especially in the winter season, which often presents a bottleneck for fish survival. In this study, we compared the diet of pelagic sticklebacks with the diet of the substantially larger native whitefish in different seasons, to evaluate the threat of the recent stickleback invasion on whitefish populations. By monthly sampling of zooplankton and both fish species diets, we could demonstrate that sticklebacks select similar prey throughout most of the year and consume more prey than whitefish during the winter. With relations between prey availability and prey selection, interspecific and intraspecific seasonal diet variability and indices like a prey-specific index of relative importance, we discuss the importance of zooplankton species traits and abundance for whitefish and stickleback predation. This study shows that sticklebacks, despite their small size, represent a serious potential diet competitor to native planktivorous fish. Sticklebacks quickly adapt to new environments, and thus we advocate precautions regarding their introduction into similar lakes as Lake Constance, as this could cause irreversible ecological changes. Bythotrephes longimanus Lake Constance overwintering strategy pelagic whitefish diet planktivory predator size seasonal prey selection stickleback invasion invazivne ribe velikost plenilcev sezonska izbira plena plenjenje planktona Bodensko jezero true false true Angleški jezik Slovenski jezik Neznano 2024-07-17 03:57:11 2024-07-18 10:20:50 2024-07-19 03:45:50 0000-00-00 00:00:00 2022 0 0 Nasl. z nasl. zaslona; Opis vira z dne 14. 12. 2022; str. 71-97 Vol. 78 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2022-11-23 574 1314-2488 10.3897/neobiota.78.86788 133759235 https://doi.org/10.3897/neobiota.78.86788 1 1d90ffb9-43cf-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=26766 RAZ_Ogorelec_Ziga_2022.pdf RAZ_Ogorelec_Ziga_2022.pdf 1 009FAA1C0A1B9E1805B0218E9555759B c7824efe965d585bb24645f1957e9ff0176dfd4509ccd79a03b0985ebf260953 9f759e65-44ce-11ef-b487-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=26905 Nacionalni inštitut za biologijo 0 0 0