Abstract
The critically endangered Spitsbergen stock of bowhead whale (Balaena mysticetus) seems to be increasing. However, research effort has also been increasing confounding a firm conclusion. A systematic aerial survey for walrus (Odobaenus rosmarus), applying distance sampling methodology in part of the Northeast Water Polynya (NEW), revealed a ‘bycatch’ of several observations of bowhead whales, which resulted in an estimated abundance of 102 (95 % CI 32–329) individuals. This is the largest abundance of bowhead whales reported from the Greenland Sea since the days of whaling in the sixteenth to seventeenth centuries. The NEW was inaccessible to vessels during the whaling period because of heavy pack ice, and it is only recently that researchers have visited this area; thus only a few sightings of bowhead whales within the NEW exist prior to the survey in 2009. The NEW may nevertheless be one of the most important summering grounds for the Spitsbergen stock, and the whales may benefit from advection of calanoid copepods from the productive deep basins along the coast of Svalbard east of the NEW. This discovery provides renewed hope for the Spitsbergen stock of bowhead whales that until now has shown only inconclusive signs of recovery despite more than 100 years of protection from whaling.
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Acknowledgments
The walrus survey was financed by Dancea (Danish Cooperation for the Environment in the Arctic, Danish Ministry of the Environment), by the Greenland Institute of Natural Resources and was organized by Erik W. Born. Two anonymous reviewers kindly improved the manuscript.
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Boertmann, D., Kyhn, L.A., Witting, L. et al. A hidden getaway for bowhead whales in the Greenland Sea. Polar Biol 38, 1315–1319 (2015). https://doi.org/10.1007/s00300-015-1695-y
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DOI: https://doi.org/10.1007/s00300-015-1695-y