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 togather photogr...
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ftoceandocs:oai:aquadocs.org:1834/30937 2023-05-15T16:05:44+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 563-580 http://hdl.handle.net/1834/30937 en eng http://fishbull.noaa.gov/1024/calam.pdf 0090-0656 http://hdl.handle.net/1834/30937 http://aquaticcommons.org/id/eprint/15084 403 2014-05-27 14:45:15 15084 United States National Marine Fisheries Service Ecology Fisheries Management article TRUE 2004 ftoceandocs 2023-04-06T17:04:18Z 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 togather photographic identification data on humpback whales (Megaptera novaeangliae) and killer whales (Orcinus orca) to examine movements and population structure. In the sixyears 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 atotal 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 between1995 and 2000; in 2002, however, the estimate was 562 (CV= 0.21) whales. A total of 191 unique individuals wereidentified 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 southernand northern residents, transients, and offshore-type killer whales. Dall’s porpoise (Phocoenoides dalli) were themost 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 pinnipedsobserved. 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 IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Pacific McArthur ENVELOPE(-70.337,-70.337,-71.166,-71.166) |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
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 togather photographic identification data on humpback whales (Megaptera novaeangliae) and killer whales (Orcinus orca) to examine movements and population structure. In the sixyears 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 atotal 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 between1995 and 2000; in 2002, however, the estimate was 562 (CV= 0.21) whales. A total of 191 unique individuals wereidentified 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 southernand northern residents, transients, and offshore-type killer whales. Dall’s porpoise (Phocoenoides dalli) were themost 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 pinnipedsobserved. 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://hdl.handle.net/1834/30937 |
long_lat |
ENVELOPE(-70.337,-70.337,-71.166,-71.166) |
geographic |
Pacific McArthur |
geographic_facet |
Pacific McArthur |
genre |
Elephant Seals Megaptera novaeangliae Orca Orcinus orca Callorhinus ursinus |
genre_facet |
Elephant Seals Megaptera novaeangliae Orca Orcinus orca Callorhinus ursinus |
op_source |
http://aquaticcommons.org/id/eprint/15084 403 2014-05-27 14:45:15 15084 United States National Marine Fisheries Service |
op_relation |
http://fishbull.noaa.gov/1024/calam.pdf 0090-0656 http://hdl.handle.net/1834/30937 |
_version_ |
1766401630840815616 |