Seasonality of blue and fin whale calls and the influence of sea ice in the Western Antarctic Peninsula

Sirovic, Ana, Hildebrand, John A., Wiggins, Sean M., McDonald, Mark A., Moore, Sue E. and Thiele, Deborah 2004, Seasonality of blue and fin whale calls and the influence of sea ice in the Western Antarctic Peninsula, Deep-sea research. Part II, Topical studies in oceanography, vol. 51, no. 17-19, pp. 2327-2344, doi: 10.1016/j.dsr2.2004.08.005.

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Title Seasonality of blue and fin whale calls and the influence of sea ice in the Western Antarctic Peninsula
Author(s) Sirovic, Ana
Hildebrand, John A.
Wiggins, Sean M.
McDonald, Mark A.
Moore, Sue E.
Thiele, Deborah
Journal name Deep-sea research. Part II, Topical studies in oceanography
Volume number 51
Issue number 17-19
Start page 2327
End page 2344
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2004-08
ISSN 0967-0645
Summary The calling seasonality of blue (Balaenoptera musculus) and fin (B. physalus) whales was assessed using acoustic data recorded on seven autonomous acoustic recording packages (ARPs) deployed from March 2001 to February 2003 in the Western Antarctic Peninsula. Automatic detection and acoustic power analysis methods were used for determining presence and absence of whale calls. Blue whale calls were detected year round, on average 177 days per year, with peak calling in March and April, and a secondary peak in October and November. Lowest calling rates occurred between June and September, and in December. Fin whale calling rates were seasonal with calls detected between February and June (on average 51 days/year), and peak calling in May. Sea ice formed a month later and retreated a month earlier in 2001 than in 2002 over all recording sites. During the entire deployment period, detected calls of both species of whales showed negative correlation with sea ice concentrations at all sites, suggesting an absence of blue and fin whales in areas covered with sea ice. A conservative density estimate of calling whales from the acoustic data yields 0.43 calling blue whales per 1000 n mi2 and 1.30 calling fin whales per 1000 n mi2, which is about one-third higher than the density of blue whales and approximately equal to the density of fin whales estimated from the visual surveys.

Notes Cover date : August-September 2004
Language eng
DOI 10.1016/j.dsr2.2004.08.005
Field of Research 050209 Natural Resource Management
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2004, Elsevier Ltd.
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