Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island

de Bruyn, P.J.Nico., Tosh, Cheryl A., Oosthuizen, W. Chris., Bester, Marthán N. and Arnould, John P.Y 2009, Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island, Marine ecology progress series, vol. 394, pp. 263-276.

Attached Files
Name Description MIMEType Size Downloads

Title Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island
Author(s) de Bruyn, P.J.Nico.
Tosh, Cheryl A.
Oosthuizen, W. Chris.
Bester, Marthán N.
Arnould, John P.Y
Journal name Marine ecology progress series
Volume number 394
Start page 263
End page 276
Total pages 14
Publisher Inter-Research
Place of publication Oldendorf, Germany
Publication date 2009-11-18
ISSN 0171-8630
1616-1599
Keyword(s) Otariid
Arctocephalus tropicalis
Foraging ecology
Satellite telemetry
Oceanography
Area-restricted movement
Diet
Del Caño Rise
Summary Sixteen lactating subantarctic fur seals Arctocephalus tropicalis were satellite-tracked during the winter of 2006 (n = 6), summer of 2006/07 (n = 6) and autumn/winter (n = 4) of 2007, from Marion Island, Southern Ocean. Despite varied individual movement patterns, a favoured foraging area lay to the northeast of the island. In contrast to findings for populations at similar latitudes, seals from Marion Island did not undertake short overnight foraging trips, but trips consistently went beyond 300 km from the island. This aligns with the at-sea duration of lactating seals’ foraging trips from temperate Amsterdam Island, but differs from subantarctic Crozet and Macquarie islands. Time spent at sea, maximum distances travelled and movement variation of tracks from the island varied seasonally. Faecal analysis suggests the diet comprised primarily myctophid fish with limited seasonal variation. Well-defined areas of restricted movement coincided with significant bathymetric features to the west/northwest of the Crozet Plateau, with the Del Caño Rise clearly being important. Positive and negative sea-surface height anomalies (compared to the mean) appeared to be preferred by most seals across seasons. Higher summer sea-surface temperatures correlated with the movements of some seals. Higher chlorophyll a concentrations dictated transit and foraging areas during summer. Bathymetrically influenced oceanographic variables likely explain these preferred long-distance eastward movements. The Îles Crozet and Marion island subantarctic fur seals differ in their foraging ecology despite being neighbours. Conversely, the subantarctic fur seal populations from the distant Amsterdam and Marion islands appear to be similarly influenced by such environmental factors.
Language eng
Field of Research 060207 Population Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2009, Inter-Research
Persistent URL http://hdl.handle.net/10536/DRO/DU:30028501

Document type: Journal Article
Collection: School of Life and Environmental Sciences
Connect to link resolver
 
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 14 times in TR Web of Science
Scopus Citation Count Cited 14 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 353 Abstract Views, 3 File Downloads  -  Detailed Statistics
Created: Wed, 05 May 2010, 11:40:10 EST by Teresa Treffry

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.