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Ecology of Weddell seals during winter: Influence of environmental parameters on their foraging behaviour

Citation

Heerah, K and Andrews-Goff, V and Williams, GD and Sultan, E and Hindell, MA and Patterson, T and Charrassin, J-B, Ecology of Weddell seals during winter: Influence of environmental parameters on their foraging behaviour, Deep-Sea Research Part II: Topical Studies in Oceanography, 88-89 pp. 23-33. ISSN 0967-0645 (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Elsevier

DOI: doi:10.1016/j.dsr2.2012.08.025

Abstract

Studying the foraging strategies of top predators can provide information on both how animals interact with their environment and the distribution of their prey. We studied the winter foraging behaviour of Weddell seals in Adélie Land, East Antarctica, and the influence of abiotic parameters (bathymetry, hydrology, sea ice, light intensity) on their foraging behaviour. A total of six seals were fitted with Conductivity Temperature Depth Satellite Relayed Data Loggers (CTD-SRDL) at Dumont D'Urville (∼67°S, 140°E) during the austral winters in 2007 and 2008. The tags transmitted positions and dive information over 169±31 day, providing a total of 20,400 dive profiles and 2350 CTD profiles. Significant environmental influences on seal diving behaviour and habitat use were detected. Seals dived deeper, longer and increased their foraging effort during the day than at night with intermediate values for twilight. During the winter season the maximum dive depth decreased in association with an increase in dive duration, but foraging effort was unchanged. Seals spent more time at the bottom of their dives in shallow waters associated with relatively smooth bathymetry and dominated by Antarctic Surface Water. Considering the whole winter, Weddell seals tended to favour enriched, warmer and less dense water masses following their seasonal appearance on the shelf (Antarctic Surface Water and Modified Circumpolar Deep Water). Our results are consistent with seals feeding primarily on Pleuragramma antarcticum during winter, tracking their vertical diel migrations and foraging in areas associated with bathymetric and hydrographic features likely to concentrate prey patches.

Item Details

Item Type:Refereed Article
Keywords:Weddell seals; Foraging behaviour; Austral winter; Telemetry; Oceanography; Marine ecology
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
Author:Andrews-Goff, V (Ms Virginia Andrews-Goff)
Author:Williams, GD (Associate Professor Guy Williams)
Author:Hindell, MA (Professor Mark Hindell)
ID Code:86833
Year Published:2013
Web of Science® Times Cited:17
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-10-27
Last Modified:2014-05-14
Downloads:0

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