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Sexual segregation in habitat use is smaller than expected in a highly dimorphic marine predator, the southern sea lion

Baylis, AMM, Orben, RA, Costa, DP, Arnould, John and Staniland, IJ 2016, Sexual segregation in habitat use is smaller than expected in a highly dimorphic marine predator, the southern sea lion, Marine ecology progress series, vol. 554, pp. 201-211, doi: 10.3354/meps11759.

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Title Sexual segregation in habitat use is smaller than expected in a highly dimorphic marine predator, the southern sea lion
Author(s) Baylis, AMM
Orben, RA
Costa, DP
Arnould, JohnORCID iD for Arnould, John orcid.org/0000-0003-1124-9330
Staniland, IJ
Journal name Marine ecology progress series
Volume number 554
Start page 201
End page 211
Total pages 11
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2016-07
ISSN 1616-1599
Keyword(s) Habitat selection
Science & Technology
Life Sciences & Biomedicine
Physical Sciences
Ecology
Marine & Freshwater Biology
Oceanography
Environmental Sciences & Ecology
Habitat selection
Dietary segregation
Niche variation
Otaria byronia
South American sea lions
NEW-ZEALAND
FUR SEALS
FORAGING BEHAVIOR
OTARIA-FLAVESCENS
HOME-RANGE
POPULATION
PATTERNS
OVERLAP
Summary Sexual segregation in habitat use is widely reported in many taxa and can profoundly influence the distribution and behaviour of animals. However, our knowledge of the mechanisms driving sexual segregation is still in its infancy (particularly in marine taxa) and the influence of extrinsic factors in mediating the expression of sex differences in foraging behaviour is underdeveloped. Here, we combine data from biologging tags, with stable isotope analysis of vibrissae, to assess sexual segregation in southern sea lions (SSL) (Otaria flavescens) breeding at the Falkland Islands in the South Atlantic. We found evidence to support segregation, most notably in δ13C and δ15N values. However, in spite of extreme sexual size dimorphism and differing constraints related to female-only parental care, adult male and adult female SSL overlapped considerably in isotopic niches and foraging area, and shared similar foraging trip characteristics (such as distance and duration). This is in contrast to SSL breeding in Argentina, where prior studies report sexual differences in foraging locations and foraging trip characteristics. We posit that sexual segregation in SSL is influenced by habitat availability (defined here as the width of the Patagonian Shelf) and individual foraging preferences, rather than commonly invoked individual-based limiting factors per se.
Language eng
DOI 10.3354/meps11759
Field of Research 060201 Behavioural Ecology
060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
0602 Ecology
0608 Zoology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Inter-Research
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085548

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Created: Mon, 14 Nov 2016, 14:44:41 EST

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