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

Hoskins, Andrew J., Costa, D.P., Wheatley, K.E., Gibbens, J.R. and Arnould, John P.Y. 2015, Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals, Marine ecology progress series, vol. 526, pp. 227-239, doi: 10.3354/meps11200.

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Title Influence of intrinsic variation on foraging behaviour of adult female Australian fur seals
Author(s) Hoskins, Andrew J.
Costa, D.P.
Wheatley, K.E.
Gibbens, J.R.
Arnould, John P.Y.ORCID iD for Arnould, John P.Y.
Journal name Marine ecology progress series
Volume number 526
Start page 227
End page 239
Total pages 13
Publisher Inter-Research
Place of publication Amelinghausen, Germany
Publication date 2015-04-22
ISSN 0171-8630
Keyword(s) Age effects
Foraging behaviour
Intrinsic variation
Phenotypic variation
Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Marine & Freshwater Biology
Environmental Sciences & Ecology
Summary 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.
Language eng
DOI 10.3354/meps11200
Field of Research 060201 Behavioural Ecology
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Inter-Research
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