Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands
Groups of sperm whales, composed mostly of females and their offspring, which were tracked in the waters off the Galápagos Islands during 1985 and 1987, generally foraged in ranks about 550 m long aligned perpendicular to the direction of travel. While at the surface, they swam in clusters containin...
Published in: | Canadian Journal of Zoology |
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Language: | English |
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Canadian Science Publishing
1989
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Online Access: | http://dx.doi.org/10.1139/z89-303 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-303 |
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crcansciencepubl:10.1139/z89-303 2024-06-23T07:56:12+00:00 Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands Whitehead, Hal 1989 http://dx.doi.org/10.1139/z89-303 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-303 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 67, issue 9, page 2131-2139 ISSN 0008-4301 1480-3283 journal-article 1989 crcansciencepubl https://doi.org/10.1139/z89-303 2024-05-30T08:13:50Z Groups of sperm whales, composed mostly of females and their offspring, which were tracked in the waters off the Galápagos Islands during 1985 and 1987, generally foraged in ranks about 550 m long aligned perpendicular to the direction of travel. While at the surface, they swam in clusters containing a mean of 1.7 whales, and these clusters were spaced out along the rank. When feeding at depth the whales were estimated to be about 40 m apart. The ranks travelled at approximately 2 kn (3.7 km/h) and maintained their headings for periods of several hours. Individuals showed some coordination in the timing of their dives. There were no indications that individual whales, mature males, or first-year calves were more likely to be found in particular positions along the rank. The major benefits for individuals of foraging in a rank are probably gathering information about prey densities, avoiding mutual interference, and possibly catching prey that elude other members of the formation. Article in Journal/Newspaper Physeter macrocephalus Canadian Science Publishing Canadian Journal of Zoology 67 9 2131 2139 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Groups of sperm whales, composed mostly of females and their offspring, which were tracked in the waters off the Galápagos Islands during 1985 and 1987, generally foraged in ranks about 550 m long aligned perpendicular to the direction of travel. While at the surface, they swam in clusters containing a mean of 1.7 whales, and these clusters were spaced out along the rank. When feeding at depth the whales were estimated to be about 40 m apart. The ranks travelled at approximately 2 kn (3.7 km/h) and maintained their headings for periods of several hours. Individuals showed some coordination in the timing of their dives. There were no indications that individual whales, mature males, or first-year calves were more likely to be found in particular positions along the rank. The major benefits for individuals of foraging in a rank are probably gathering information about prey densities, avoiding mutual interference, and possibly catching prey that elude other members of the formation. |
format |
Article in Journal/Newspaper |
author |
Whitehead, Hal |
spellingShingle |
Whitehead, Hal Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
author_facet |
Whitehead, Hal |
author_sort |
Whitehead, Hal |
title |
Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
title_short |
Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
title_full |
Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
title_fullStr |
Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
title_full_unstemmed |
Formations of foraging sperm whales, Physeter macrocephalus, off the Galápagos Islands |
title_sort |
formations of foraging sperm whales, physeter macrocephalus, off the galápagos islands |
publisher |
Canadian Science Publishing |
publishDate |
1989 |
url |
http://dx.doi.org/10.1139/z89-303 http://www.nrcresearchpress.com/doi/pdf/10.1139/z89-303 |
genre |
Physeter macrocephalus |
genre_facet |
Physeter macrocephalus |
op_source |
Canadian Journal of Zoology volume 67, issue 9, page 2131-2139 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z89-303 |
container_title |
Canadian Journal of Zoology |
container_volume |
67 |
container_issue |
9 |
container_start_page |
2131 |
op_container_end_page |
2139 |
_version_ |
1802649158126927872 |