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recent paper in Deep-Sea Research I

Subject: recent paper in Deep-Sea Research I
From: Kate Stafford <>
Date: Wed, 10 Nov 2004 09:02:06 -0800
Deep-Sea Research I
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 W.A. Watkins, M.A. Daher, J.E. George and D. Rodriguez. 2004. Twelve
 years of tracking 52-Hz whale calls from a unique source in the North
 Pacific. Deep-Sea Research I.
     A unique whale call with 50-52 Hz emphasis from a single source
 has been tracked over 12 years in the central and eastern North
 Pacific.  These calls, referred to as 52-Hz calls, were monitored and
 analyzed from acoustic data recorded by hydrophones of the US Navy
 Sound Surveillance System (SOSUS) and other arrays.  The calls were
 noticed first in 1989, and have been detected and tracked since
 1992. No other calls with similar characteristics have been identified
 in the acoustic data from any hydrophone system in the North Pacific
 basin. Only one series of these 52-Hz calls has been recorded at a
 time, with no call overlap, suggesting that a single whale produced
 the calls. The calls were recorded from August to February with most
 in December and January. The species producing these calls is
 unknown. The tracks of the 52-Hz whale were different each year, and
 varied in length from 708 to 11,062 km with travel speeds ranging from
 0.7 to 3.8 km/h. Tracks included (A) meandering over short ranges, (B)
 predominantly west-to-east movement, and (C) mostly north-to-south
 travel. These tracks consistently appeared to be unrelated to the
 presence or movement of other whale species (blue, fin and humpback)
 monitored year-round with the same hydrophones.

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