Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast
We examined the summer distribution of marine mammals off the northern Washington coast based on six ship transect surveys conducted between 1995 and 2002, primarily from the NOAA ship McArthur. Additionally, small boat surveys were conducted in the same region between 1989 and 2002 to gather photog...
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ftaquaticcommons:oai:generic.eprints.org:15084 2023-05-15T16:05:45+02:00 Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast Calambokidis, John Steiger, Gretchen H. Ellifrit, David K. Troutman, Barry L. Bowlby, C. Edward 2004 application/pdf http://aquaticcommons.org/15084/ http://fishbull.noaa.gov/1024/calam.pdf http://aquaticcommons.org/15084/1/calam.pdf en eng http://aquaticcommons.org/15084/1/calam.pdf Calambokidis, John and Steiger, Gretchen H. and Ellifrit, David K. and Troutman, Barry L. and Bowlby, C. Edward (2004) Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast. Fishery Bulletin, 102(4), pp. 563-580. Ecology Fisheries Management Article PeerReviewed 2004 ftaquaticcommons 2020-02-27T09:26:46Z We examined the summer distribution of marine mammals off the northern Washington coast based on six ship transect surveys conducted between 1995 and 2002, primarily from the NOAA ship McArthur. Additionally, small boat surveys were conducted in the same region between 1989 and 2002 to gather photographic identification data on humpback whales (Megaptera novaeangliae) and killer whales (Orcinus orca) to examine movements and population structure. In the six years of ship survey effort, 706 sightings of 15 marine mammal species were made. Humpback whales were the most common large cetacean species and were seen every year and a total of 232 sightings of 402 animals were recorded during ship surveys. Highest numbers were observed in 2002, when there were 79 sightings of 139 whales. Line-transect estimates for humpback whales indicated that about 100 humpback whales inhabited these waters each year between 1995 and 2000; in 2002, however, the estimate was 562 (CV= 0.21) whales. A total of 191 unique individuals were identified photographically and mark recapture estimates also indicated that the number of animals increased from under 100 to over 200 from 1995 to 2002. There was only limited interchange of humpback whales between this area and feeding areas off Oregon and California. Killer whales were also seen on every ship survey and represented all known ecotypes of the Pacific Northwest, including southern and northern residents, transients, and offshore-type killer whales. Dall’s porpoise (Phocoenoides dalli) were the most frequently sighted small cetacean; abundance was estimated at 181−291 individuals, except for 2002 when we observed dramatically higher numbers (876, CV= 0.30). Northern fur seals (Callorhinus ursinus) and elephant seals (Mirounga angustirostris) were the most common pinnipeds observed. There were clear habitat differences related to distance offshore and water depth for different species. Article in Journal/Newspaper Elephant Seals Megaptera novaeangliae Orca Orcinus orca Callorhinus ursinus International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons McArthur ENVELOPE(-70.337,-70.337,-71.166,-71.166) Pacific |
institution |
Open Polar |
collection |
International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
op_collection_id |
ftaquaticcommons |
language |
English |
topic |
Ecology Fisheries Management |
spellingShingle |
Ecology Fisheries Management Calambokidis, John Steiger, Gretchen H. Ellifrit, David K. Troutman, Barry L. Bowlby, C. Edward Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
topic_facet |
Ecology Fisheries Management |
description |
We examined the summer distribution of marine mammals off the northern Washington coast based on six ship transect surveys conducted between 1995 and 2002, primarily from the NOAA ship McArthur. Additionally, small boat surveys were conducted in the same region between 1989 and 2002 to gather photographic identification data on humpback whales (Megaptera novaeangliae) and killer whales (Orcinus orca) to examine movements and population structure. In the six years of ship survey effort, 706 sightings of 15 marine mammal species were made. Humpback whales were the most common large cetacean species and were seen every year and a total of 232 sightings of 402 animals were recorded during ship surveys. Highest numbers were observed in 2002, when there were 79 sightings of 139 whales. Line-transect estimates for humpback whales indicated that about 100 humpback whales inhabited these waters each year between 1995 and 2000; in 2002, however, the estimate was 562 (CV= 0.21) whales. A total of 191 unique individuals were identified photographically and mark recapture estimates also indicated that the number of animals increased from under 100 to over 200 from 1995 to 2002. There was only limited interchange of humpback whales between this area and feeding areas off Oregon and California. Killer whales were also seen on every ship survey and represented all known ecotypes of the Pacific Northwest, including southern and northern residents, transients, and offshore-type killer whales. Dall’s porpoise (Phocoenoides dalli) were the most frequently sighted small cetacean; abundance was estimated at 181−291 individuals, except for 2002 when we observed dramatically higher numbers (876, CV= 0.30). Northern fur seals (Callorhinus ursinus) and elephant seals (Mirounga angustirostris) were the most common pinnipeds observed. There were clear habitat differences related to distance offshore and water depth for different species. |
format |
Article in Journal/Newspaper |
author |
Calambokidis, John Steiger, Gretchen H. Ellifrit, David K. Troutman, Barry L. Bowlby, C. Edward |
author_facet |
Calambokidis, John Steiger, Gretchen H. Ellifrit, David K. Troutman, Barry L. Bowlby, C. Edward |
author_sort |
Calambokidis, John |
title |
Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
title_short |
Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
title_full |
Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
title_fullStr |
Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
title_full_unstemmed |
Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast |
title_sort |
distribution and abundance of humpback whales (megaptera novaeangliae) and other marine mammals off the northern washington coast |
publishDate |
2004 |
url |
http://aquaticcommons.org/15084/ http://fishbull.noaa.gov/1024/calam.pdf http://aquaticcommons.org/15084/1/calam.pdf |
long_lat |
ENVELOPE(-70.337,-70.337,-71.166,-71.166) |
geographic |
McArthur Pacific |
geographic_facet |
McArthur Pacific |
genre |
Elephant Seals Megaptera novaeangliae Orca Orcinus orca Callorhinus ursinus |
genre_facet |
Elephant Seals Megaptera novaeangliae Orca Orcinus orca Callorhinus ursinus |
op_relation |
http://aquaticcommons.org/15084/1/calam.pdf Calambokidis, John and Steiger, Gretchen H. and Ellifrit, David K. and Troutman, Barry L. and Bowlby, C. Edward (2004) Distribution and abundance of humpback whales (Megaptera novaeangliae) and other marine mammals off the northern Washington coast. Fishery Bulletin, 102(4), pp. 563-580. |
_version_ |
1766401646242299904 |