Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica
The hourglass dolphin Lagenorhynchus cruciger is the only regularly occurring small delphinid found south of the Antarctic Polar Front, yet little is known about its ecology and habitat use. This study uses 8 years (14 cruises) of standardized shipboard surveys during January–March (2003–2011) in so...
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ftzenodo:oai:zenodo.org:1232673 2023-05-15T13:38:08+02:00 Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica Santora, Jarrod A. 2011-12-03 https://zenodo.org/record/1232673 https://doi.org/10.1007/s00300-011-1133-8 unknown https://zenodo.org/record/1232673 https://doi.org/10.1007/s00300-011-1133-8 oai:zenodo.org:1232673 info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/article publication-article 2011 ftzenodo https://doi.org/10.1007/s00300-011-1133-8 2023-03-11T00:55:07Z The hourglass dolphin Lagenorhynchus cruciger is the only regularly occurring small delphinid found south of the Antarctic Polar Front, yet little is known about its ecology and habitat use. This study uses 8 years (14 cruises) of standardized shipboard surveys during January–March (2003–2011) in southern Drake Passage near the South Shetland Islands to summarize the spatial distribution of hourglass dolphin sightings and quantify habitat use. Sighting data are linked to bathymetry (depth, slope) and distance to the average location of oceanographic features. A generalized linear model is used to examine the relationships between sightings and habitat features. Hourglass dolphins were sighted on 50% of surveys (n = 29); sightings were concentrated in February. Group size tended to be 2–6 individuals; there were only 2 sightings of larger groups, of 15 and 25 individuals. Sightings were distributed entirely within the deep pelagic waters north of the South Shetland Islands in southern Drake Passage and were closely associated with the southern boundary of the Antarctic Circumpolar Current. Information on occurrence and distribution reported in this study may be useful for refining habitat associations for hourglass dolphins at regional scales in the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctica Drake Passage Hourglass dolphin Lagenorhynchus cruciger South Shetland Islands Southern Ocean Zenodo Antarctic Drake Passage South Shetland Islands Southern Ocean The Antarctic Polar Biology 35 5 801 806 |
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The hourglass dolphin Lagenorhynchus cruciger is the only regularly occurring small delphinid found south of the Antarctic Polar Front, yet little is known about its ecology and habitat use. This study uses 8 years (14 cruises) of standardized shipboard surveys during January–March (2003–2011) in southern Drake Passage near the South Shetland Islands to summarize the spatial distribution of hourglass dolphin sightings and quantify habitat use. Sighting data are linked to bathymetry (depth, slope) and distance to the average location of oceanographic features. A generalized linear model is used to examine the relationships between sightings and habitat features. Hourglass dolphins were sighted on 50% of surveys (n = 29); sightings were concentrated in February. Group size tended to be 2–6 individuals; there were only 2 sightings of larger groups, of 15 and 25 individuals. Sightings were distributed entirely within the deep pelagic waters north of the South Shetland Islands in southern Drake Passage and were closely associated with the southern boundary of the Antarctic Circumpolar Current. Information on occurrence and distribution reported in this study may be useful for refining habitat associations for hourglass dolphins at regional scales in the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Santora, Jarrod A. |
spellingShingle |
Santora, Jarrod A. Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
author_facet |
Santora, Jarrod A. |
author_sort |
Santora, Jarrod A. |
title |
Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
title_short |
Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
title_full |
Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
title_fullStr |
Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
title_full_unstemmed |
Habitat use of hourglass dolphins near the South Shetland Islands, Antarctica |
title_sort |
habitat use of hourglass dolphins near the south shetland islands, antarctica |
publishDate |
2011 |
url |
https://zenodo.org/record/1232673 https://doi.org/10.1007/s00300-011-1133-8 |
geographic |
Antarctic Drake Passage South Shetland Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Drake Passage South Shetland Islands Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Drake Passage Hourglass dolphin Lagenorhynchus cruciger South Shetland Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Drake Passage Hourglass dolphin Lagenorhynchus cruciger South Shetland Islands Southern Ocean |
op_relation |
https://zenodo.org/record/1232673 https://doi.org/10.1007/s00300-011-1133-8 oai:zenodo.org:1232673 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.1007/s00300-011-1133-8 |
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Polar Biology |
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35 |
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5 |
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801 |
op_container_end_page |
806 |
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1766101843092439040 |