eCite Digital Repository

Contrasting behavior between two populations of an ice-obligate predator in East Antarctica


Heerah, K and Hindell, M and Andrew-Goff, V and Field, I and McMahon, CR and Charrassin, J-B, Contrasting behavior between two populations of an ice-obligate predator in East Antarctica, Ecology and Evolution, 7, (2) pp. 606-618. ISSN 2045-7758 (2017) [Refereed Article]


Copyright Statement

Copyright 2016 The Authors Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1002/ece3.2652


The Austral autumn–winter is a critical period for capital breeders such as Weddell seals that must optimize resource acquisition and storage to provision breeding in the subsequent spring. However, how Weddell seals find food in the winter months remains poorly documented. We equipped adult Weddell seals after their annual molt with satellite-relayed data loggers at two sites in East Antarctica: Dumont D'Urville (n = 12, DDU) and Davis (n = 20). We used binomial generalized mixed-effect models to investigate Weddell seals’ behavioral response (i.e., "hunting" vs. "transit") to physical aspects of their environment (e.g., ice concentration). Weddell seal foraging was concentrated to within 5 km of a breathing hole, and they appear to move between holes as local food is depleted. There were regional differences in behavior so that seals at Davis traveled greater distances (three times more) and spent less time in hunting mode (half the time) than seals at DDU. Despite these differences, hunting dives at both locations were pelagic, concentrated in areas of high ice concentration, and over areas of complex bathymetry. There was also a seasonal change in diving behavior from transiting early in the season to more hunting during winter. Our observations suggest that Weddell seal foraging behavior is plastic and that they respond behaviorally to changes in their environment to maximize food acquisition and storage. Such plasticity is a hallmark of animals that live in very dynamic environments such as the high Antarctic where resources are unpredictable.

Item Details

Item Type:Refereed Article
Keywords:Foraging ecology, predator, Antarctica, Weddell seal, capital breeder, first-passage time, habitat use, movement patterns, pinnipeds, polar regions, winter
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:Heerah, K (Ms Karine Heerah)
UTAS Author:Hindell, M (Professor Mark Hindell)
UTAS Author:Andrew-Goff, V (Ms Virginia Andrews-Goff)
ID Code:115542
Year Published:2017
Funding Support:Australian Research Council (DP0342714)
Web of Science® Times Cited:13
Deposited By:Ecology and Biodiversity
Deposited On:2017-03-30
Last Modified:2018-04-24
Downloads:344 View Download Statistics

Repository Staff Only: item control page