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Seasonal dietary shift to zooplankton influences stable isotope ratios and total mercury concentrations in Arctic charr (Salvelinus alpinus (L.))

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Abstract

Seasonal dietary shifts by Arctic charr (Salvelinus alpinus (L.)) are common in subarctic lakes, but less is known about how the shift to pelagic zooplankton feeding during the growing season affects stable isotope ratios and mercury concentrations. We sampled Arctic charr, zooplankton and benthic macroinvertebrates from oligotrophic Lake Galggojavri, northern Norway, in June, August and September. Stomach content, age, total length, weight, condition and sex were recorded for all individuals, and liver and muscle tissues were sampled for stable isotope (δ13C, δ15N) and total mercury analyses. We predicted that a dietary shift to zooplankton would lead to depleted 13C and increased mercury levels in charr. Arctic charr consumed benthic prey in June, but shifted to zooplankton feeding in August–September. Stable isotope mixing models revealed increased pelagic reliance towards September. Mercury content in liver increased from June to September, whereas muscle showed opposite trend. In stepwise multiple regression analyses, mercury content in muscle was explained by fish length, month and δ13C (R 2 = 0.46), whereas in liver month, δ13C and δ15N were the main explaining factors (R 2 = 0.69). Seasonal dietary shifts appeared to have an effect on total mercury content in charr, and thus sampling month should be considered when designing future monitoring programmes.

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Acknowledgments

We are grateful to T. Holopainen, O. Kalttopää, K. Leinonen, T. Lepistö, O. Saari and E. Tulisalo for their help in field and laboratory work. Kilpisjärvi Biological Station provided excellent facilities during the study. Financial support for the study was obtained from European Regional Developmental Fund (A30205) and Academy of Finland (1140903, 1268566). We thank Guest editors M. Power and M. Jobling as well as the anonymous referees for their constructive comments on previous versions of manuscript.

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Authors and Affiliations

  1. Kilpisjärvi Biological Station, University of Helsinki, Käsivarrentie 14622, 99490, Kilpisjärvi, Finland

    K. K. Kahilainen, B. Hayden, K. Tuohiluoto & A. Järvinen

  2. Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014, Helsinki, Finland

    K. K. Kahilainen, S. M. Thomas, O. Keva, B. Hayden & T. Malinen

  3. Biology Department, Canadian Rivers Institute, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada

    B. Hayden

  4. Department of Arctic and Marine Biology, UiT The Arctic University of Norway, 9037, Tromsø, Norway

    R. Knudsen & P.-A. Amundsen

  5. Aquatic Ecology Department, Norwegian Institute for Nature Research, P.O. Box 5685, Sluppen, 7485, Trondheim, Norway

    A. P. Eloranta

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  1. K. K. Kahilainen
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  2. S. M. Thomas
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  3. O. Keva
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  7. K. Tuohiluoto
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  8. P.-A. Amundsen
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  9. T. Malinen
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  10. A. Järvinen
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Correspondence to K. K. Kahilainen.

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Guest editors: M. Power, R. Knudsen, C. Adams, M. J. Hansen, J. B. Dempson, M. Jobling & M. Ferguson / Advances in Charr Ecology and Evolution

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Kahilainen, K.K., Thomas, S.M., Keva, O. et al. Seasonal dietary shift to zooplankton influences stable isotope ratios and total mercury concentrations in Arctic charr (Salvelinus alpinus (L.)). Hydrobiologia 783, 47–63 (2016). https://doi.org/10.1007/s10750-016-2685-y

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