What is the invasiveness of Hemimysis anomala (Crustacea, Mysidae) in the large deep Lake Bourget, France?
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Non-native species are a major threat to aquatic ecosystems and the assessment of their invasiveness may be limited by the diverse ecological features needed to be accounted for. In this study, we combined complementary features of the autoecology and trophic ecology of Hemimysis anomala in a large deep lake (Lake Bourget) to assess its invasiveness. It was present in more than 80% of the 23 sites explored, indicating an extensive colonization of the lake. The mysid exhibited at least two generations per year, and the median individual growth rate was ~ 0.04 mg dry mass day−1 and ~ 0.09 mg dry mass day−1 for juveniles and adults, respectively. Consequently, the daily production for a typical reproductive swarm could reach more than 250 mg dry mass day−1 m−2 representing an important hotspot of secondary production. Individual measurements of stable carbon (δ13C) and nitrogen (δ15N) isotopes highlighted a trophic ontogenetic shift and indicated that subpopulations of H. anomala could mainly rely either on benthic or pelagic resources depending on the slope of the site. Because of its extensive colonization, its high growth rate, and trophic plasticity, H. anomala exhibits a high invasiveness and may strongly alter the food web of Lake Bourget.
KeywordsHemimysis anomala Invasive species Stable isotopes Trophic ecology Ontogenetic shift
We are indebted to Katya Kovalenko, Luigi Naselli-Flores, as well as three anonymous reviewers for their valuable comments that greatly improved early versions of the manuscript. We also would like to thank the Université de Savoie Mont-Blanc for the financial support of this study through the “BIB” project. We are grateful to Dominique Picard and the Club de Plongée de Chambéry (GSRL) for assistance in the search for H. anomala during diving explorations, as well as to Marie Rosières and Jean-Noël Avrillier for their support in conditioning H. anomala for the analyses of stable isotopes and individual measurements.
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