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Isotopes suggest trophic differences between alien Radix auricularia (Linnaeus, 1758) (Lymnaeidae) and sympatric endemic gastropods in Lake Baikal

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Abstract

In recent decades, the Eurasian native and invasive gastropod Radix auricularia has been found widely dispersed in the endemic communities of Lake Baikal. A comparative analysis of stable carbon (δ13C) and nitrogen (δ15N) isotopes in the foot tissues of individuals of this species and endemics with similar shell sizes, filter-feeding Parabaikalia florii (Baicaliidae) and grazer-scraper Benedictia baicalensis (Benedictiidae), was carried out to identify possible competition for food resources between the three coexisting species. Despite the similarity of the δ15N values (P = 0.37), R. auricularia and P. florii have non-overlapping isotopic niches (P = 0.001), assimilating different components of phytonutrients. Radix auricularia and B. baicalensis differed in the δ15N values (P = 0.001) with a significant overlap of the isotopic niches (P = 0.66) due to the ability of the latter to consume food of animal origin. We additionally discuss the disparities and similarities of the basic components in the food boluses of the alien and endemic species.

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The data that support the findings of this study are available from the authors upon reasonable request.

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Acknowledgements

The authors thank the crews of the R/V “Titov” and “Papanin” for their help in collecting the material, family of the first author for the financial assistance in the analysis of stable isotopes. We are grateful to the reviewers, Dr. Maxim Vinarski and Dr. Ellinor Michel, for their comments and corrections of our mistakes, especially Dr. Ellinor Michel, who significantly improved the text with editorial input.

Funding

The study was carried out within the state-funded projects conducted by Limnological Institute SB RAS (Reg. Numbers 121032300180-7, 121032300224-8).

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Correspondence to Tatyana Sitnikova or Natalia Maximova.

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Sitnikova, T., Kiyashko, S., Khanaev, I. et al. Isotopes suggest trophic differences between alien Radix auricularia (Linnaeus, 1758) (Lymnaeidae) and sympatric endemic gastropods in Lake Baikal. Hydrobiologia (2024). https://doi.org/10.1007/s10750-024-05517-2

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  • DOI: https://doi.org/10.1007/s10750-024-05517-2

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