Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island
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 th...
Main Authors: | , , , , |
---|---|
Format: | Other Non-Article Part of Journal/Newspaper |
Language: | unknown |
Published: |
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/10536/DRO/DU:30028501 https://figshare.com/articles/journal_contribution/Bathymetry_and_frontal_system_interactions_influence_seasonal_foraging_movements_of_lactating_subantarctic_fur_seals_from_Marion_Island/21032326 |
id |
ftdeakinunifig:oai:figshare.com:article/21032326 |
---|---|
record_format |
openpolar |
spelling |
ftdeakinunifig:oai:figshare.com:article/21032326 2023-05-15T13:22:34+02:00 Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island P de Bruyn C Tosh W Oosthuizen M Bester John Arnould 2009-11-18T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30028501 https://figshare.com/articles/journal_contribution/Bathymetry_and_frontal_system_interactions_influence_seasonal_foraging_movements_of_lactating_subantarctic_fur_seals_from_Marion_Island/21032326 unknown http://hdl.handle.net/10536/DRO/DU:30028501 https://figshare.com/articles/journal_contribution/Bathymetry_and_frontal_system_interactions_influence_seasonal_foraging_movements_of_lactating_subantarctic_fur_seals_from_Marion_Island/21032326 All Rights Reserved Oceanography Ecology Zoology Otariid Arctocephalus tropicalis Foraging ecology Satellite telemetry Area-restricted movement Diet Del Caño Rise Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology Del Cano Rise PRINCE-EDWARD ISLANDS SOUTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA OCEANOGRAPHIC FEATURES PHYTOPLANKTON BLOOM ATTENDANCE PATTERNS DIVING BEHAVIOR CROZET PLATEAU KILLER WHALES ORCINUS-ORCA Text Journal contribution 2009 ftdeakinunifig 2022-11-17T22:37:30Z 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. Other Non-Article Part of Journal/Newspaper Amsterdam Island Arctocephalus gazella Elephant Seals Îles Crozet Marion Island Orca Orcinus orca Prince Edward Islands Southern Elephant Seals Southern Ocean DRO - Deakin Research Online Southern Ocean |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Oceanography Ecology Zoology Otariid Arctocephalus tropicalis Foraging ecology Satellite telemetry Area-restricted movement Diet Del Caño Rise Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology Del Cano Rise PRINCE-EDWARD ISLANDS SOUTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA OCEANOGRAPHIC FEATURES PHYTOPLANKTON BLOOM ATTENDANCE PATTERNS DIVING BEHAVIOR CROZET PLATEAU KILLER WHALES ORCINUS-ORCA |
spellingShingle |
Oceanography Ecology Zoology Otariid Arctocephalus tropicalis Foraging ecology Satellite telemetry Area-restricted movement Diet Del Caño Rise Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology Del Cano Rise PRINCE-EDWARD ISLANDS SOUTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA OCEANOGRAPHIC FEATURES PHYTOPLANKTON BLOOM ATTENDANCE PATTERNS DIVING BEHAVIOR CROZET PLATEAU KILLER WHALES ORCINUS-ORCA P de Bruyn C Tosh W Oosthuizen M Bester John Arnould Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
topic_facet |
Oceanography Ecology Zoology Otariid Arctocephalus tropicalis Foraging ecology Satellite telemetry Area-restricted movement Diet Del Caño Rise Science & Technology Life Sciences & Biomedicine Physical Sciences Marine & Freshwater Biology Environmental Sciences & Ecology Del Cano Rise PRINCE-EDWARD ISLANDS SOUTHERN ELEPHANT SEALS ARCTOCEPHALUS-GAZELLA OCEANOGRAPHIC FEATURES PHYTOPLANKTON BLOOM ATTENDANCE PATTERNS DIVING BEHAVIOR CROZET PLATEAU KILLER WHALES ORCINUS-ORCA |
description |
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. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
P de Bruyn C Tosh W Oosthuizen M Bester John Arnould |
author_facet |
P de Bruyn C Tosh W Oosthuizen M Bester John Arnould |
author_sort |
P de Bruyn |
title |
Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
title_short |
Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
title_full |
Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
title_fullStr |
Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
title_full_unstemmed |
Bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from Marion Island |
title_sort |
bathymetry and frontal system interactions influence seasonal foraging movements of lactating subantarctic fur seals from marion island |
publishDate |
2009 |
url |
http://hdl.handle.net/10536/DRO/DU:30028501 https://figshare.com/articles/journal_contribution/Bathymetry_and_frontal_system_interactions_influence_seasonal_foraging_movements_of_lactating_subantarctic_fur_seals_from_Marion_Island/21032326 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Amsterdam Island Arctocephalus gazella Elephant Seals Îles Crozet Marion Island Orca Orcinus orca Prince Edward Islands Southern Elephant Seals Southern Ocean |
genre_facet |
Amsterdam Island Arctocephalus gazella Elephant Seals Îles Crozet Marion Island Orca Orcinus orca Prince Edward Islands Southern Elephant Seals Southern Ocean |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30028501 https://figshare.com/articles/journal_contribution/Bathymetry_and_frontal_system_interactions_influence_seasonal_foraging_movements_of_lactating_subantarctic_fur_seals_from_Marion_Island/21032326 |
op_rights |
All Rights Reserved |
_version_ |
1766365526366355456 |