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Marine Mammal Science article

Subject: Marine Mammal Science article
From: Jason Gedamke <>
Date: Wed, 04 Feb 2004 12:04:21 -0800
Volume 20, Number 1
 January 2004
 GULF OF ALASKA, 1999-2001. David K. Mellinger, Kathleen M. Stafford, and
 Christopher G. Fox, pages 48-62.
 An acoustic survey for sperm whales was conducted in the Gulf of Alaska.
 Six autonomous hydrophones continuously recorded sound signals below 500
 Hz from October 1999 to May 2001. After recovery, recordings were
 processed using an automatic process to detect usual clicks of sperm
 whales. The detection algorithm equalized background noise, summed the
 data in a frequency band, and then used autocorrelation to detect the
 whales' highly regular clicks. Detections were checked manually, revealing
 that 98% of detections did contain clicks. Results indicate that sperm
 whales are present in the Gulf of Alaska year-round; this result extends
 what is known from whaling data, which were gathered principally in
 summer. Sperm whales were more common in summer than winter by a factor of
 roughly two, and occurred less often at the westernmost site surveyed
 (52N, 157W) than elsewhere in the Gulf. This is the first study of sperm
 whales based exclusively on remote acoustic sensing. This methodology is
 feasible because sperm whale clicks extend to frequencies (100 Hz) low
 enough to be recorded by low-sample-rate instruments that operate
 continuously, and because the detection algorithm has a low
 false-detection rate. The methodology may be replicated to facilitate
 comparisons between different time periods and geographic regions.
 Reprints are available from [EMAIL PROTECTED]

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