Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals

Luque, Sebastián P., Arnould, John P. Y. and Guinet, Christophe 2008, Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals, Marine ecology - progress series, vol. 372, pp. 277-287.

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Title Temporal structure of diving behaviour in sympatric Antarctic and Subantarctic fur seals
Author(s) Luque, Sebastián P.
Arnould, John P. Y.
Guinet, Christophe
Journal name Marine ecology - progress series
Volume number 372
Start page 277
End page 287
Total pages 11
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2008
ISSN 0171-8630
1616-1599
Keyword(s) optimal foraging
foraging niche segregation
foraging behaviour
diel trends
diurnal activity
myctophidae
syntopy
archival tags
Summary Lactation is considerably briefer (4 vs. 10 mo) and daily pup energy expenditure higher in Antarctic (AFS) than in subantarctic fur seals (SFS), even in sympatric populations of both species, where their foraging locations and diets are similar. Therefore, lactational demands may be higher for AFS females. We investigated whether sympatric lactating AFS and SFS females differ in their physiological or behavioural diving capacities, and in the temporal structure of foraging behaviour. Mean dive depth and duration were greater in SFS, but dives below 140 m were performed only by AFS. An index of activity level during the bottom phase of dives, when fur seals are thought to capture prey, was higher in SFS. Despite these differences, SFS females showed a steady increase in the minimum postdive interval following dives lasting longer than 250 s, compared to the steady increase following dives lasting longer than only 150 s in AFS. These results suggest that physiological constraints on diving behaviour are stronger on AFS females, and that the behavioural aerobic dive limit is greater for SFS. Assuming that dive bouts reflect foraging in prey patches, AFS females exploited more patches per unit time, and remained in them for briefer periods of time, compared to SFS females. Dive bout structure did not differ between overnight and long foraging trips. Our data suggest that AFS females spend greater foraging effort, but may gain access to prey patches of better quality, which may help them cope with higher lactational demands.
Language eng
Field of Research 060201 Behavioural Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2008
Copyright notice ©2008, Inter-Research.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017841

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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