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Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals

Citation

Hoskins, AJ and Costa, DP and Wheatley, KE and Gibbens, JR and Arnould, JPY, Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals, Marine Ecology - Progress Series, 526 pp. 227-239. ISSN 0171-8630 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Inter-Research

DOI: doi:10.3354/meps11200

Abstract

Phenotypic variation and individual experience can create behavioural and/or dietary variation within a population. This may reduce intra-specific competition, creating a buffer to environmental change. This study examined how intrinsic variation affects foraging behaviour of Australian fur seals. Foraging movements of 29 female Australian fur seals were recorded using FastLoc GPS and dive behaviour recorders. For each individual, body mass, flipper length and axis length were recorded, a tooth was sampled to determine age, and milk was collected for diet analysis. Clustering of fatty acid dietary analysis revealed 5 distinct groups in the population. Behaviour was described using 19 indices, which were then reduced to 7 principal components (>80% of the behavioural variation). Bayesian mixed effect models were developed to describe the relationship between these components and intrinsic variation. No association was found between diet and age or body shape; however, age had a negative relationship with component 1 (27% of variation). Older females spent less time at-sea and foraged nearer to the colony. Age had an effect on component 5 (7% of variation), which represented haul-outs and dive depth; older females made fewer visits to haul-out sites and dived deeper to the benthos. This suggests that as animals age they are able to utilise prior knowledge to exploit nearby foraging sites that younger animals are either unaware of, or have yet to gain the experience required to efficiently utilise. Mass had a negative effect on components representing the directedness of a foraging trip, suggesting heavier individuals were more likely to travel directly to a foraging site.

Item Details

Item Type:Refereed Article
Keywords:intrinsic variation, foraging behaviour, age effects, phenotypic variation
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Behaviour
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Marine Flora, Fauna and Biodiversity
Author:Wheatley, KE (Dr Kathryn Wheatley)
ID Code:105899
Year Published:2015
Web of Science® Times Cited:3
Deposited By:Zoology
Deposited On:2016-01-20
Last Modified:2016-05-30
Downloads:0

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