Behavioural Changes in Belugas (Delphinapterus leucas) During a Killer Whale (Orcinus orca) Attack in Southwest Hudson Bay

The Canadian Field-Naturalist

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Title Behavioural Changes in Belugas (Delphinapterus leucas) During a Killer Whale (Orcinus orca) Attack in Southwest Hudson Bay
 
Creator Westdal, Kristin H
Davies, Jeremy
McPherson, Andy
Orr, Jack
Ferguson, Steven H
 
Subject Beluga Whale; Delphinapterus leucas; home range; Hudson Bay; Killer Whale; Orcinus orca; Orca; predation; sea ice
 
Description Killer Whales (Orcinus orca) were observed on 4 August 2012 attacking Belugas (Delphinapterus leucas) at high tide near the mouth of the Seal River (59°9'19"N, 94°45'28"W) in southwest Hudson Bay, near the location where six Belugas had been fitted with satellite transmitters three weeks earlier. The distribution of Belugas was analyzed before, during, and after the attack. In the presence of Killer Whales, the six Belugas altered their behaviour by reducing their combined range size from 285 km2 four days before the attack to 172 km2 on the day of the attack. Their range more than tripled, to 655 km2, in the days immediately following the attack before returning to the pre-attack size. Following the attack, the tagged Belugas expanded their range northward, going from a mean pre-attack distance of 9.4 km from the attack site to a maximum of 23.5 km. Visual observations of Belugas clumping together and moving toward shore corroborated satellite data. This evasive behaviour by Belugas was different from that reported for Narwhals (Monodon monoceros) suggesting that the two monodontid species may have evolved different survival strategies related to the risk of Killer Whale predation. With predicted changes to Arctic sea ice, the summeringhabitat of Belugas will be available to their main predator for longer periods. A better understanding of Beluga behaviour and risk of predation is required for Beluga conservation and stock management.
 
Publisher The Ottawa Field-Naturalists' Club
 
Contributor
 
Date 2017-03-29
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

 
Format application/pdf
 
Identifier http://journals.sfu.ca/cfn/index.php/cfn/article/view/1925
10.22621/cfn.v130i4.1925
 
Source The Canadian Field-Naturalist; Vol 130, No 4 (2016); 315-319
0008-3550
 
Language eng
 
Relation http://journals.sfu.ca/cfn/index.php/cfn/article/view/1925/1849
 
Rights Copyright (c) 2017 The Canadian Field-Naturalist
 

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