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new paper in deep-sea research II

Subject: new paper in deep-sea research II
From: Kate Stafford <>
Date: Wed, 01 Dec 2004 13:36:19 -0800
 Seasonality of blue and fin whale calls and the influence of sea ice in
 the Western Antarctic Peninsula.  2004. Ana Sirovic, John A. Hildebrand,
 Sean M. Wiggins, Mark A. McDonald, Sue E. Moore and Deborah Thiele.  
 Deep-Sea Research II, 51: 2327?2344.
     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 nmi2
 and 1.30 calling fin whales per 1000 nmi2, 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.

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