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Recruitment dynamics of Hiatella arctica within a high Arctic site (Young Sound Fjord, NE Greenland)

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Abstract

Recruitment dynamics including what determines the success or failure of Arctic benthic invertebrates are poorly known despite their important role for population dynamics. The main objective of this study was to assess the potential influence of extreme physical constraints related to freshwater discharge on the recruitment of a dominant bivalve Hiatella arctica within a High Arctic fjord (Young Sound, NE Greenland). We collected young recruits over several sampling periods from 2016 to 2018 at two contrasting sites (inner vs. middle fjord) for 5-weeks to 12-months and measured their abundance, size at metamorphosis and lipid class composition. Young stages of H. arctica settled from June to the end of October, when trophic conditions are optimal. We hypothesize that growth stops during winter due to poor trophic conditions. Data suggest that abundance of recruits, their total lipid concentration and composition of lipid classes are similar at both sites. However, size classes were different with six separate cohorts detected at one station and one at the inner station, which may be attributed to discrete spawning events and possible secondary migration. Based on an assessment of their potential age, we hypothesize that spat batches recruiting earlier in the summer exhibit better growth performance probably related to better food quality and quantity.

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Acknowledgements

A big thanks to Egon Frandsen, E. Amice, J. Grall and J.-M. Warnet for their contributions in the field work. We are greatly indebted to the MarineBasis programme and the Zackenberg/Daneborg staff and the Sirius Patrol for their support in the field. Department of Ecoscience, Aarhus University, is acknowledged for providing logistics at the Zackenberg Research Station Northeast Greenland. Thanks to J.-B. Nadalini for his help on laboratory analyses. Friendly thanks to J. Jourde, M. Le Duff, V. Le Garrec, G. Droual, C. Uhlir, A.-H. Tandberg, and N. Shunatova for their teaching on species identification. This work was a Master 2 project of the first author funded by the Interdisciplinary School for the Blue Planet (ISblue) from the Brittany Regional Council and the Université de Bretagne Occidentale/LIA BeBEST. This research was supported by the Institut Polaire Français Paul-Emile Victor (IPEV—PRIVARC project), the European H2020 INTAROS program, the Observatoire Marin de l’IUEM (UMS3113) and by Natural Sciences and Engineering Research Council of Canada (NSERC-Discovery Grant no. 299100). Part of the data included in this manuscript was provided by the MarineBasis programme. This study is an international collaboration between the BeBEST International Laboratory (UBO, UQAR, CNRS, and MNHN) and the Aarhus University. Finally, we thank the reviewers Dr. Peter A. Lezin and J. Pineda and the editor Alexey Sukhotin for their constructive feedback, valuable suggestions, and timely handling of this manuscript.

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DV acquired shell length and fatty acid data, performed statistical analyses, and wrote the initial MS draft. RT supervised fatty acid and shell length analyses, contributed to interpretation and manuscript review. MKS helped in field operations and collecting biological and environmental data, contributed to interpretation and manuscript review. LC helped in field operations (scuba-diving) and collecting biological and environmental data, contributed to interpretation and manuscript review. EC supervised modal decomposition analysis of shell length data, contributed to interpretation and manuscript review. FO conceived and supervised the sampling survey, led the project administration and funding acquisition, contributed to interpretation and manuscript review.

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Correspondence to Delphine Veillard.

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Veillard, D., Tremblay, R., Sejr, M.K. et al. Recruitment dynamics of Hiatella arctica within a high Arctic site (Young Sound Fjord, NE Greenland). Polar Biol 46, 1275–1286 (2023). https://doi.org/10.1007/s00300-023-03201-0

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  • DOI: https://doi.org/10.1007/s00300-023-03201-0

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