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New article- Southern Ocean Whale & Seal acoustic survey [Sec=Unclassifi

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Subject: New article- Southern Ocean Whale & Seal acoustic survey [Sec=Unclassified]
From: Jason Gedamke <>
Date: Thu, 26 Aug 2010 10:57:35 +1000

This recently published article is available online.  Of particular interest 
were acoustic detections of pygmy blue whale sounds in the Southern Ocean; the 
first published descriptions of new Ross seal vocalizations; the far northerly 
distribution of leopard seal detections; and the regional 'dialect' associated 
with fin whale song.  The abstract follows with more details.

Gedamke, J. and Robinson, S.M. 2010. Acoustic survey for marine mammal 
occurrence and distribution off East Antarctica (30-80°E) in January-February 
2006.  Deep Sea Research Part II: Topical Studies in Oceanography  Volume 57, 
Issues 9-10, May 2010, Pages 968-981.

If interested, you can download it at
or request it by contacting me directly.


A large scale, systematic, acoustic survey for whales and seals in eastern 
Antarctic waters was conducted in January-February 2006. During the BROKE-West 
survey of Southern Ocean waters between 30 and 80° E longitude, an acoustic 
survey was conducted to complement a traditional visual survey for marine 
mammal occurrence and distribution. As part of the survey, 145 DIFAR sonobuoys 
were deployed every 30' of latitude on north-south transects, and prior to CTD 
stations on the initial east-west transect. Underwater sound was analyzed for 
70 minute samples from each sonobuoy. Blue whales were the most commonly 
recorded species, identified at 55 of the sonobuoy deployment sites. Other 
species recorded include: sperm (46 sites), fin (14), humpback (2), and sei (3) 
whales, and leopard (11) and Ross (17) seals. Large numbers of blue and sperm 
whales, and all Ross seals were detected on the westernmost two transects, 
which were the only transects of the survey with relatively extensive sea ice 
remaining off the continental shelf. Large numbers of blue whales were also 
detected in the more eastern waters of the survey off the Prydz Bay region, 
while two detections of pygmy blue whales represent the farthest south these 
whales have been recorded. Of the relatively few fin whale detections, most 
occurred in more northerly waters. Fin whale vocalizations from this region 
were distinctly different than those recorded elsewhere around Antarctica 
suggesting acoustic recordings may be useful to delineate regional or stock 
boundaries of this species. Previously undescribed sounds were attributed to 
Ross seals. Acoustic detections of these and leopard seal sounds indicate these 
animals venture further from their traditionally described distributions, with 
vocalizing leopard seals occurring much further north than might be expected. 
Overall, the results of the sonobuoy survey provide a measure of each species' 
relative spatial distribution over the survey area based on acoustic 
detections, and when combined with the results of the visual survey, will 
provide a comprehensive view of marine mammal distribution throughout the 
region during the BROKE-West survey.

Jason Gedamke, PhD
Australian Marine Mammal Centre
Australian Antarctic Division
203 Channel Highway
Kingston, TAS 7050

ph:  +61 (0)3 6232 3153
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