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Seasonal detections of bearded seal (Erignathus barbatus) vocalizations in Baffin Bay and Davis Strait in relation to sea ice concentration

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Abstract

There is limited information about the biology and seasonal distribution of bearded seals (Erignathus barbatus) in Greenland. The species is highly ice-associated and depends on sea ice for hauling out and giving birth, making it vulnerable to climate change. We investigated the seasonality and distribution of bearded seal vocalizations at seven different locations across southern Baffin Bay and Davis Strait, West Greenland. Aural M2 and HARUphone recorders were deployed on the sea bottom during 2006–2007 and 2011–2013. Recordings were analyzed for presence/absence of bearded seal calls relative to location (including distance to shore and depth), mean sea ice concentration and diel patterns. Calling occurred between November and late June with most intense calling during the mating season at all sites. There was a clear effect of depth and distance to shore on the number of detections, and the Greenland shelf (< 300 m) appeared to be the preferred habitat for bearded seals during the mating season. These results suggest that bearded seals may retreat with the receding sea ice to Canada during summer or possibly spend the summer along the West Greenland coast. It is also possible that, due to seasonal changes in bearded seal vocal behavior, animals may have been present in our study area in summer, but silent. The number of detections was affected by the timing of sea ice formation but not sea ice concentration. Diel patterns were consistent with patterns found in other parts of the Arctic, with a peak during early morning (0400 local) and a minimum during late afternoon (1600 local). While vocalization studies have been conducted on bearded seals in Norwegian, Canadian, northwest Greenland, and Alaskan territories, this study fills the gap between these areas.

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Acknowledgements

Thanks to the Captain and the crew of R/V Sanna and R/V Knorr for assistance in the field. Thanks to Craig Lee, APL, UW and his team for assistance in deployments and recovery of some of the moorings. The study was funded through grants to MS from the Oticon Foundation, the Greenland Climate Research Grants from the Danish Ministry of Higher Education and Science and the Mineral License and Safety Authority, Greenland (former Bureau of Minerals and Petroleum). Davis Strait data were supported by grants to KS from the US National Science Foundation (ARC 0532611). We thank the two anonymous reviewers and Dr. Jack Terhune, whose input improved the paper.

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Authors and Affiliations

  1. Greenland Climate Research Centre, Greenland Institute of Natural Resources, P.O. Box 570, 3900, Nuuk, Greenland

    Tenna K. Boye & Malene J. Simon

  2. Greenland Institute of Natural Resources, P.O. Box 570, 3900, Nuuk, Greenland

    Kristin L. Laidre & Frank Rigét

  3. Applied Physics Laboratory, University of Washington, 1013 NE 40th St., Seattle, WA, 98105, USA

    Kristin L. Laidre & Kathleen M. Stafford

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  1. Tenna K. Boye
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Contributions

TB, KS and MS conceived and designed research. KL and FR undertook statistical analysis. TB, FR, KL and KS analyzed data. All authors wrote and approved the manuscript.

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Correspondence to Kathleen M. Stafford.

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Boye, T.K., Simon, M.J., Laidre, K.L. et al. Seasonal detections of bearded seal (Erignathus barbatus) vocalizations in Baffin Bay and Davis Strait in relation to sea ice concentration. Polar Biol 43, 1493–1502 (2020). https://doi.org/10.1007/s00300-020-02723-1

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