Ontogeny of movements and foraging ranges in the Australian sea lion

Fowler, Shannon, Costa, Daniel and Arnould, John 2007, Ontogeny of movements and foraging ranges in the Australian sea lion, Marine mammal science, vol. 23, no. 3, pp. 598-614.


Title Ontogeny of movements and foraging ranges in the Australian sea lion
Author(s) Fowler, Shannon
Costa, Daniel
Arnould, John
Journal name Marine mammal science
Volume number 23
Issue number 3
Start page 598
End page 614
Publisher Blackwell Publishing Inc
Place of publication Malden, Mass.
Publication date 2007-07
ISSN 0824-0469
1748-7692
Keyword(s) development
foraging ecology
home ranges
learning
Neophoca cinerea
Australian sea lion
PTT
satellite telemetry
Summary This study tracked the movements of Australian sea lion (Neophoca cinerea) pups, juveniles, and adult females to identify home ranges and determine if young sea lions accompanied their mothers at sea. Satellite tags were deployed on nine 15- mo-old pups, nine 23-mo-old juveniles, and twenty-nine adult female Australian sea lions at Seal Bay Conservation Park, Kangaroo Island, South Australia. Females did not travel with their offspring at sea, suggesting young Australian sea lions learn foraging behaviors independently. Although home ranges increased with age,  23-mo-old juveniles had not developed adult movement capacity and their range was only 40.6% of the adult range. Juveniles traveled shorter distances (34.8 ± 5.5 km) at slower speeds (2.0 ± 0.3 km/h) than adults (67.9 ± 3.5 km and 3.9 ± 0.3 km/h). Young sea lions also stayed in shallower waters; sea floor depths of mean locations were 48±7m for juveniles and 74±2m for females. Restricted to shallow coastal waters, pups and juveniles are more likely to be disproportionately impacted by human activities. With limited available foraging habitat, young Australian sea lions appear particularly vulnerable to environmental alterations resulting from fisheries or climate change.
Language eng
Field of Research 060801 Animal Behaviour
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Society for Marine Mammalogy
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007305

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