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Circumpolar habitat use in the southern elephant seal: implications for foraging success and population trajectories


Hindell, MA and McMahon, CR and Bester, MN and Boehme, L and Costa, D and Fedak, MA and Guinet, C and Herraiz-Borreguero, L and Harcourt, RG and Huckstadt, L and Kovacs, KM and Lydersen, C and McIntyre, T and Muelbert, M and Patterson, T and Roquet, F and Williams, G and Charrassin, J-B, Circumpolar habitat use in the southern elephant seal: implications for foraging success and population trajectories, Ecosphere, 7, (5) Article e01213. ISSN 2150-8925 (2016) [Refereed Article]


Copyright Statement

2016 Hindell et al. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.1002/ecs2.1213


In the Southern Ocean, wide-ranging predators offer the opportunity to quantify how animals respond to differences in the environment because their behavior and population trends are an integrated signal of prevailing conditions within multiple marine habitats. Southern elephant seals in particular, can provide useful insights due to their circumpolar distribution, their long and distant migrations and their performance of extended bouts of deep diving. Furthermore, across their range, elephant seal populations have very different population trends. In this study, we present a data set from the International Polar Year project; Marine Mammals Exploring the Oceans Pole to Pole for southern elephant seals, in which a large number of instruments (N=287) deployed on animals, encompassing a broad circum-Antarctic geographic extent, collected in situ ocean data and at-sea foraging metrics that explicitly link foraging behavior and habitat structure in time and space. Broadly speaking, the seals foraged in two habitats, the relatively shallow waters of the Antarctic continental shelf and the Kerguelen Plateau and deep open water regions. Animals of both sexes were more likely to exhibit area-restricted search (ARS) behavior rather than transit in shelf habitats. While Antarctic shelf waters can be regarded as prime habitat for both sexes, female seals tend to move northwards with the advance of sea ice in the late autumn or early winter. The water masses used by the seals also influenced their behavioral mode, with female ARS behavior being most likely in modified Circumpolar Deepwater or northerly Modified Shelf Water, both of which tend to be associated with the outer reaches of the Antarctic Continental Shelf. The combined effects of (1) the differing habitat quality, (2) differing responses to encroaching ice as the winter progresses among colonies, (3) differing distances between breeding and haul-out sites and high quality habitats, and (4) differing long-term regional trends in sea ice extent can explain the differing population trends observed among elephant seal colonies.

Item Details

Item Type:Refereed Article
Keywords:habitat, telemetry
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and estuarine ecology (incl. marine ichthyology)
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Hindell, MA (Professor Mark Hindell)
UTAS Author:McMahon, CR (Dr Clive McMahon)
UTAS Author:Herraiz-Borreguero, L (Dr Laura Herraiz-Borreguero)
UTAS Author:Williams, G (Mr Guy Williams)
ID Code:110534
Year Published:2016
Web of Science® Times Cited:95
Deposited By:Ecology and Biodiversity
Deposited On:2016-08-01
Last Modified:2018-04-13
Downloads:169 View Download Statistics

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