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Return customers: foraging site fidelity and the effect of environmental variability in wide-ranging Antarctic fur seals

Citation

Arthur, B and Hindell, M and Bester, M and Trathan, P and Jonsen, I and Staniland, I and Oosthuizen, WC and Wege, M and Lea, M-A, Return customers: foraging site fidelity and the effect of environmental variability in wide-ranging Antarctic fur seals, PLoS ONE, 10, (3) Article e0120888. ISSN 1932-6203 (2015) [Refereed Article]


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Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) http://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1371/journal.pone.0120888

Abstract

Strategies employed by wide-ranging foraging animals involve consideration of habitat quality and predictability and should maximise net energy gain. Fidelity to foraging sites is common in areas of high resource availability or where predictable changes in resource availability occur. However, if resource availability is heterogeneous or unpredictable, as it often is in marine environments, then habitat familiarity may also present ecological benefits to individuals. We examined the winter foraging distribution of female Antarctic fur seals, Arctocephalus gazelle, over four years to assess the degree of foraging site fidelity at two scales; within and between years. On average, between-year fidelity was strong, with most individuals utilising more than half of their annual foraging home range over multiple years. However, fidelity was a bimodal strategy among individuals, with five out of eight animals recording between-year overlap values of greater than 50%, while three animals recorded values of less than 5%. High long-term variance in sea surface temperature, a potential proxy for elevated long-term productivity and prey availability, typified areas of overlap. Withinyear foraging site fidelity was weak, indicating that successive trips over the winter target different geographic areas. We suggest that over a season, changes in prey availability are predictable enough for individuals to shift foraging area in response, with limited associated energetic costs. Conversely, over multiple years, the availability of prey resources is less spatially and temporally predictable, increasing the potential costs of shifting foraging area and favouring long-term site fidelity. In a dynamic and patchy environment, multi-year foraging site fidelity may confer a long-term energetic advantage to the individual. Such behaviours that operate at the individual level have evolutionary and ecological implications and are potential drivers of niche specialization and modifiers of intra-specific competition.

Item Details

Item Type:Refereed Article
Keywords:foraging, habitat, seals, winter, Antarctica, evolutionary 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:Marine Flora, Fauna and Biodiversity
UTAS Author:Arthur, B (Dr Benjamin Arthur)
UTAS Author:Hindell, M (Professor Mark Hindell)
UTAS Author:Lea, M-A (Associate Professor Mary-Anne Lea)
ID Code:99614
Year Published:2015
Web of Science® Times Cited:39
Deposited By:IMAS Research and Education Centre
Deposited On:2015-03-30
Last Modified:2017-11-01
Downloads:315 View Download Statistics

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