Beluga whales in the western Beaufort Sea : current state of knowledge on timing, distribution, habitat use and environmental drivers
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The seasonal and geographic patterns in the distribution, residency, and density of two populations (Chukchi and Beaufort) of beluga whales (Delphinapterus leucas) were examined using data from aerial surveys, passive acoustic recordings, and satellite telemetry to better understand this arctic species in the oceanographically complex and changing western Beaufort Sea. An aerial survey data-based model of beluga density highlights the Beaufort Sea slope as important habitat for belugas, with westerly regions becoming more important as summer progresses into fall. The Barrow Canyon region always had the highest relative densities of belugas from July-October. Passive acoustic data showed that beluga whales occupied the Beaufort slope and Beaufort Sea from early April until early November and passed each hydrophone location in three broad pulses during this time. These pulses likely represent the migrations of the two beluga populations: the first pulse in spring being from Beaufort animals, the second spring pulse Chukchi belugas, with the third, fall pulse a combination of both populations. Core-use and home range analyses of satellite-tagged belugas showed similar use of habitats as the aerial survey data, but also showed that it is predominantly the Chukchi population of belugas that uses the western Beaufort, with the exception of September when both populations overlap. Finally, an examination of these beluga datasets in the context of wind-driven changes in the local currents and water masses suggests that belugas are highly capable of adapting to oceanographic changes that may drive the distribution of their prey.
Stafford , K M , Ferguson , M C , Hauser , D D W , Okkonen , S R , Berchok , C L , Citta , J J , Clarke , J T , Garland , E C , Jones , J & Suydam , R S 2018 , ' Beluga whales in the western Beaufort Sea : current state of knowledge on timing, distribution, habitat use and environmental drivers ' , Deep Sea Research Part II: Topical Studies in Oceanography , vol. 152 , pp. 182-194 . https://doi.org/10.1016/j.dsr2.2016.11.017
Deep Sea Research Part II: Topical Studies in Oceanography
© 2016 Elsevier Ltd. All rights reserved. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.dsr2.2016.11.017
DescriptionECG was supported by a National Research Council-National Academy of Sciences Postdoctoral Fellowship.
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