Abstract
Although knowledge of Arctic benthic biodiversity has increased considerably in recent decades, some regions, such as Northeast Greenland, remain poorly studied. The aim of this study was to complement a previous macrofaunal inventory carried out in Young Sound, a High-Arctic fjord in this region (74°N). We sampled shallow benthic assemblages along a small inner/outer fjord gradient, including one station previously prospected two decades ago and three new stations. This sampling strategy revealed highly diversified benthic assemblages (166 species identified on a total sampling area of 1.32 m2), which considerably increases the number of species recorded for the fjord (i.e. 225 species vs 100 previously recorded). The outermost station was dominated in abundance by various assemblages of bivalves, while the middle stations showed greater species evenness, including numerous species of polychaetes, bivalves and crustaceans. The innermost station was dominated by ostracods, gammarid amphipods and tube-dwelling polychaetes. Overall, benthic assemblages varied little between the four stations and the transect as a whole exhibited characteristics typical of outer fjord habitats, reflecting the rather moderate impact of meltwater inputs in this part of the fjord. Finally, trophic plasticity and omnivory were observed in most of the recorded macrobenthic species, highlighting the adaptability of these species to low trophic availability in the ecosystem. Future biodiversity studies will need to explore the innermost and deepest areas to provide a more comprehensive inventory and understanding of the influence of environmental conditions on the structure and functioning of Young Sound benthic habitats.
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All data supporting the results and analyses in this article are available in the tables included in Online Resource 1.
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Acknowledgements
We are grateful to Erwan Amice for his valuable help on the field and for sharing his photos for Fig. 4. We are grateful to Egon Randa Frandsen, Mie Sichlau Winding and Carl Isaksen for their contribution in the field, collecting samples for sediment analyses. A big thank to Gabin Droual, Vincent Le Garrec, Carolin Uhlir, Anne-Helene Tandberg and Natalia Shunatova for their help on species identification. Friendly thanks to Adeline Tauran for calculation of Chao2 and Jackknife1 estimates. This work was conducted as a part of the PhD of Guillaume Bridier co-founded by the Université de Bretagne Occidentale/LIA BeBEST and the “Allocation de Recherche Doctorale” of the Brittany Regional Council. The authors are grateful to Christine Michel and Paul Renaud as well as the two anonymous reviewers and the editor Dr. Alexey Sukhotin for their comments which improved this manuscript. This study is an international collaboration between the BeBEST International Laboratory (UBO, UQAR, CNRS, and MNHN) and the Aarhus University.
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This work is funded by the Université de Bretagne Occidentale/LIA BeBEST, the Région Bretagne (Allocation de Recherche Doctorale), the Observatoire Marin de l’IUEM, the Institut Polaire Français Paul-Emile Victor (IPEV - PRIVARC project) and the Greenland Ecosystem Monitoring Program - MarineBasis. MKS was supported by Horizon Europe project POMP (Grant 101136875).
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FO, LC and MKS conducted the field sampling campaign. GB, LP, JJ, TB, MLD and JG conducted species identifications. GB carried out the statistical analyses, interpreted the results and wrote the original draft of the manuscript. FO, LP, JJ, LC, MKS, TB, MLD and JG helped to interpret the results and write the manuscript. FO, LC, MKS and JG obtained the necessary funding for the study. FO, LC and JG developed the sampling design. All authors read and approved the manuscript.
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Bridier, G., Olivier, F., Pinsivy, L. et al. Diversity and spatial variability of shallow benthic macrofaunal assemblages in a high-Arctic fjord (Young Sound, North-East Greenland). Polar Biol 47, 333–348 (2024). https://doi.org/10.1007/s00300-024-03235-y
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DOI: https://doi.org/10.1007/s00300-024-03235-y