Seasonal variability in whale encounters in the Western Antarctic Peninsula
Cetacean sighting surveys were conducted as part of nine multidisciplinary research cruises over late summer, autumn and winter of 2 years (2001–2003) during the Southern Ocean Global Ocean Ecosystems (SO GLOBEC) program. Sea-ice cover differed markedly between years, with apparent effects on cetace...
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ftdeakinunifig:oai:figshare.com:article/20537289 2023-05-15T14:05:22+02:00 Seasonal variability in whale encounters in the Western Antarctic Peninsula Deborah Thiele Ed Chester S Moore A Sirovic J Hildebrand A Friedlaendar 2004-08-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30002711 https://figshare.com/articles/journal_contribution/Seasonal_variability_in_whale_encounters_in_the_Western_Antarctic_Peninsula/20537289 unknown http://hdl.handle.net/10536/DRO/DU:30002711 https://figshare.com/articles/journal_contribution/Seasonal_variability_in_whale_encounters_in_the_Western_Antarctic_Peninsula/20537289 All Rights Reserved Geochemistry Oceanography Ecology Science & Technology Physical Sciences SEA-ICE EXTENT EUPHAUSIA-SUPERBA MARINE MAMMALS HABITAT SELECTION WEDDELL SEA BELLINGSHAUSEN PREDATORS AMUNDSEN DYNAMICS KRILL Text Journal contribution 2004 ftdeakinunifig 2022-11-17T23:23:06Z Cetacean sighting surveys were conducted as part of nine multidisciplinary research cruises over late summer, autumn and winter of 2 years (2001–2003) during the Southern Ocean Global Ocean Ecosystems (SO GLOBEC) program. Sea-ice cover differed markedly between years, with apparent effects on cetacean distribution. No ice was present until late June in 2001, while the previous winter sea ice never fully retreated (>30% cover) during the 2002 or 2003 summer, thus increasing the proportion of thicker and more complex ice, including multi-year floes. Humpback (237 sightings; 537 individuals) and minke (103 sightings: 267 individuals) whales were the most commonly detected species. Data from seven comparable cruises were used to identify habitat for minke and humpback whales over five geographically distinct spatial divisions in the study area. In all years, both species were predominantly found in near coastal habitat, particularly in the fjords where complex habitat likely concentrated prey. In 2002 and 2003 the presence of sea ice provided additional feeding habitat, and the numbers of minkes (in winter) and humpbacks (late summer and autumn) in the area doubled compared with 2001. Humpbacks in particular were concentrated at the ice boundaries during late summer and autumn, while minke numbers increased in the winter that followed and occupied ice-covered areas along the entire shelf edge. Important resource sites for these species are mainly located in near-coastal areas and are used in all years, but when ice margins exist and intersect with resource sites they attract much larger numbers of animals due to the dynamics between sea ice and prey. Other Non-Article Part of Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea ice covered areas DRO - Deakin Research Online Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Geochemistry Oceanography Ecology Science & Technology Physical Sciences SEA-ICE EXTENT EUPHAUSIA-SUPERBA MARINE MAMMALS HABITAT SELECTION WEDDELL SEA BELLINGSHAUSEN PREDATORS AMUNDSEN DYNAMICS KRILL |
spellingShingle |
Geochemistry Oceanography Ecology Science & Technology Physical Sciences SEA-ICE EXTENT EUPHAUSIA-SUPERBA MARINE MAMMALS HABITAT SELECTION WEDDELL SEA BELLINGSHAUSEN PREDATORS AMUNDSEN DYNAMICS KRILL Deborah Thiele Ed Chester S Moore A Sirovic J Hildebrand A Friedlaendar Seasonal variability in whale encounters in the Western Antarctic Peninsula |
topic_facet |
Geochemistry Oceanography Ecology Science & Technology Physical Sciences SEA-ICE EXTENT EUPHAUSIA-SUPERBA MARINE MAMMALS HABITAT SELECTION WEDDELL SEA BELLINGSHAUSEN PREDATORS AMUNDSEN DYNAMICS KRILL |
description |
Cetacean sighting surveys were conducted as part of nine multidisciplinary research cruises over late summer, autumn and winter of 2 years (2001–2003) during the Southern Ocean Global Ocean Ecosystems (SO GLOBEC) program. Sea-ice cover differed markedly between years, with apparent effects on cetacean distribution. No ice was present until late June in 2001, while the previous winter sea ice never fully retreated (>30% cover) during the 2002 or 2003 summer, thus increasing the proportion of thicker and more complex ice, including multi-year floes. Humpback (237 sightings; 537 individuals) and minke (103 sightings: 267 individuals) whales were the most commonly detected species. Data from seven comparable cruises were used to identify habitat for minke and humpback whales over five geographically distinct spatial divisions in the study area. In all years, both species were predominantly found in near coastal habitat, particularly in the fjords where complex habitat likely concentrated prey. In 2002 and 2003 the presence of sea ice provided additional feeding habitat, and the numbers of minkes (in winter) and humpbacks (late summer and autumn) in the area doubled compared with 2001. Humpbacks in particular were concentrated at the ice boundaries during late summer and autumn, while minke numbers increased in the winter that followed and occupied ice-covered areas along the entire shelf edge. Important resource sites for these species are mainly located in near-coastal areas and are used in all years, but when ice margins exist and intersect with resource sites they attract much larger numbers of animals due to the dynamics between sea ice and prey. |
format |
Other Non-Article Part of Journal/Newspaper |
author |
Deborah Thiele Ed Chester S Moore A Sirovic J Hildebrand A Friedlaendar |
author_facet |
Deborah Thiele Ed Chester S Moore A Sirovic J Hildebrand A Friedlaendar |
author_sort |
Deborah Thiele |
title |
Seasonal variability in whale encounters in the Western Antarctic Peninsula |
title_short |
Seasonal variability in whale encounters in the Western Antarctic Peninsula |
title_full |
Seasonal variability in whale encounters in the Western Antarctic Peninsula |
title_fullStr |
Seasonal variability in whale encounters in the Western Antarctic Peninsula |
title_full_unstemmed |
Seasonal variability in whale encounters in the Western Antarctic Peninsula |
title_sort |
seasonal variability in whale encounters in the western antarctic peninsula |
publishDate |
2004 |
url |
http://hdl.handle.net/10536/DRO/DU:30002711 https://figshare.com/articles/journal_contribution/Seasonal_variability_in_whale_encounters_in_the_Western_Antarctic_Peninsula/20537289 |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea ice covered areas |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Euphausia superba Sea ice Southern Ocean Weddell Sea ice covered areas |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30002711 https://figshare.com/articles/journal_contribution/Seasonal_variability_in_whale_encounters_in_the_Western_Antarctic_Peninsula/20537289 |
op_rights |
All Rights Reserved |
_version_ |
1766277183033049088 |