Informace o publikaci
Stable isotope analysis reveals fish juveniles as a temporal dominant in the diet of invasive pumpkinseed (Lepomis gibbosus)
| Autoři | |
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| Rok publikování | 2024 |
| Druh | Další prezentace na konferencích |
| Fakulta / Pracoviště MU | |
| Citace | |
| Popis | The pumpkinseed Lepomis gibbosus (Linnaeus, 1758) is a small centrarchid fish species, originating from North America, that has invaded most European basins, with pronounced expected impacts. Analyses of pumpkinseed diet in its invasive range show macrozoobenthos as the most common dietary item, suggesting a competitive effect on native fish communities. All non-native dietary studies so far, however, have relied on gut content analysis (GCA), which can severely underestimate predatory effects. Our study 1) uses a combination of GCA and stable isotope analysis (SIA) to document pumpkinseed diet at two different sites (borrow pit, oxbow) in its invaded range, and 2) relates pumpkinseed diet preferences with parasitic load. SIA revealed juvenile fish as a major prey item at the oxbow, while macrozoobenthos domination at the borrow pit. On the other hand, GCA showed pumpkinseed preying mostly on macroinvertebrates (chironomids, gastropods, Ephemeroptera and Zygoptera larvae) at both sites. While infrequent infection by trophically-transmitted parasitic nematodes could be related to low consumption of zooplankton, substantial infection by metacercariae of Posthodiplostomum centrarchi Hoffman, 1958 appears to reflect relatively high consumption rates of its intermediate host, physid snails. The difference in results of two different approaches in fish diet analysis shown by our study emphasise the need for combining multiple methods when studying the impact of non-native species on food webs. Acknowledgement: This study was supported by CSF project No. 20-29111S |