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Environmental drivers of foraging behaviour during long-distance foraging trips of male Antarctic fur seals

Citation

Salton, M and Bestley, S and Gales, N and Harcourt, R, Environmental drivers of foraging behaviour during long-distance foraging trips of male Antarctic fur seals, Animal Behaviour, 183 pp. 103-116. ISSN 0003-3472 (2022) [Refereed Article]


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Copyright Statement

2021 The Association for the Study of Animal Behaviour. Published by Elsevier.

DOI: doi:10.1016/j.anbehav.2021.11.006

Abstract

Animals may use long-distance foraging trips to capitalize on spatiotemporal variation in food availability, allowing individuals to maximize resource gain from foraging effort. This is particularly important for dimorphic species with polygynous mating where males face strong selection pressures to attain large size and access to reproductive females. We tracked 17 male Antarctic fur seals, Arctocephalus gazella, during their prolonged postbreeding trips and assessed links between their movements and environmental predictors of profitable feeding areas. Males made one of two types of trips: a long trip to the Antarctic ice edge or shorter trips to areas where the southern Antarctic Circumpolar Current fronts generate high biological activity. The trip type was not determined by body size but was related to departure date from the breeding area, suggesting that males must trade off opportunities at the breeding area (reproductive, social interactions) and foraging opportunities between breeding seasons. Regardless of trip structure, males focused search effort far from foraging areas of central-place foraging seabirds and seals including female Antarctic fur seals provisioning offspring. Males showed clear spatiotemporal patterns in dive behaviour, with deep dives in shelf waters during the day and predominantly shallower dives in pelagic waters at night. Diel dive patterns showed monthly changes in photoperiod and lunar phase, consistent with feeding on vertically migrating prey. However, males did not use area-restricted search to focus dive effort, instead performing a mix of foraging and nonforaging behaviour within and between restricted search areas. We discuss the scale and type of inference that can be made from movement models, given the behavioural constraints that govern long-distance trips in vast, heterogeneous environments like the Southern Ocean.

Item Details

Item Type:Refereed Article
Keywords:Antarctic Circumpolar Current, area-restricted search, biologging, competition, dive behaviour, sea ice, spatial heterogeneity
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Behavioural ecology
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Assessment and management of Antarctic and Southern Ocean ecosystems
UTAS Author:Bestley, S (Dr Sophie Bestley)
ID Code:148507
Year Published:2022
Deposited By:Ecology and Biodiversity
Deposited On:2022-01-17
Last Modified:2022-02-24
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