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Increased sightings of subArctic cetaceans in the eastern Chukchi Sea, 2008-2016: population recovery, response to climate change, or increased survey effort?
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- Author(s): Brower, Amelia A.; Clarke, Janet T.; Ferguson, Megan C.
- Source:
Polar Biology; May2018, Vol. 41 Issue 5, p1033-1039, 7p, 2 Graphs, 1 Map- Subject Terms:
- Source:
- Additional Information
- Abstract: Cetacean occurrence in the Chukchi Sea is seasonal and primarily driven by annual sea ice retreat and prey occurrence in spring through fall. Humpback whales (
Megaptera novaeangliae ), fin whales (Balaenoptera physalus ), and minke whales (Balaenoptera acutorostrata ), although often found in polar waters elsewhere, are not common in the eastern Chukchi Sea, and here are referred to as “subArctic” species. Increasing numbers of these subArctic cetacean species were documented during aerial surveys in the eastern Chukchi Sea (67°-72°N, 157°-169°W) in July-October 2008-2016. The majority (78%) of these sightings occurred on the continental shelf in the south-central Chukchi Sea (67°-69°N, 166°-169°W) in August and September. During similar aerial surveys in 1982-1991, there was a complete lack of sightings of subArctic species. The disparity in sightings between the two time periods could be due to increased marine mammal survey effort in recent years during the months when subArctic cetacean species would be expected to occur, population recoveries from commercial whaling, climate change, or, most likely, a combination of all three. [ABSTRACT FROM AUTHOR] - Abstract: Copyright of Polar Biology is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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