Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California
From December to February in most years from 1967 to 2007,observers counted gray whales, Eschrichtius robustus, from shore sites south of Carmel in central California. In addition to gray whales, other cetacean species were also recorded. These observations were summarized and compared among survey...
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ftoceandocs:oai:aquadocs.org:1834/26276 2023-05-15T15:36:09+02:00 Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California Shelden, Kim E. W. Rugh, David J. 2010 application/pdf 1-19 http://hdl.handle.net/1834/26276 en eng http://spo.nmfs.noaa.gov/mfr724/mfr7241.pdf 0090-1830 http://hdl.handle.net/1834/26276 http://aquaticcommons.org/id/eprint/9668 403 2012-08-14 16:32:20 9668 United States National Marine Fisheries Service Conservation Fisheries Management article TRUE 2010 ftoceandocs 2023-04-06T17:03:09Z From December to February in most years from 1967 to 2007,observers counted gray whales, Eschrichtius robustus, from shore sites south of Carmel in central California. In addition to gray whales, other cetacean species were also recorded. These observations were summarized and compared among survey platforms and to ocean conditions. Eleven cetacean species were identified including eight odontocete species (killer whale, Orcinus orca; Pacific white-sideddolphin, Lagenorhynchus obliquidens; common dolphin, Delphinus spp.; bottlenose dolphin, Tursiops truncatus, northern right whale dolphin, Lissodelphis borealis; Risso’s dolphin, Grampus griseus; Dall’s porpoise, Phocoenoides dalli; and harbor porpoise, Phocoena phocoena)and three mysticete species (humpback whale, Megaptera novaeangliae; minke whale, Balaenoptera acutorostrata; andblue whale, Balaenoptera musculus). As expected, the detection of certain species among survey platforms (shore-based census watches, 25-power “Big Eye” binocular watches, and aerial surveys) was limited by species surfacing behavior and/or bathymetric preference. Comparisons among the shore-based census efforts showed a significant difference in sightings rates from 1967–84 (n = 14, mean= 0.11, SD = 0.11) to 1985–2007 (n = 11, mean = 1.48, SD = 0.47; t-Test: p < 0.001, df = 23). The warm period observedduring the 1990’s may partially explain the increase in sighting rates and diversity of species observed at the census site compared to the much cooler temperatures ofthe 1970’s. Article in Journal/Newspaper Balaenoptera acutorostrata Balaenoptera musculus Humpback Whale Killer Whale Megaptera novaeangliae minke whale Orca Orcinus orca Phocoena phocoena Killer whale IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications Granite Canyon ENVELOPE(-136.212,-136.212,62.850,62.850) Pacific |
institution |
Open Polar |
collection |
IODE-UNESCO: OceanDocs - E-Repository of Ocean Publications |
op_collection_id |
ftoceandocs |
language |
English |
topic |
Conservation Fisheries Management |
spellingShingle |
Conservation Fisheries Management Shelden, Kim E. W. Rugh, David J. Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
topic_facet |
Conservation Fisheries Management |
description |
From December to February in most years from 1967 to 2007,observers counted gray whales, Eschrichtius robustus, from shore sites south of Carmel in central California. In addition to gray whales, other cetacean species were also recorded. These observations were summarized and compared among survey platforms and to ocean conditions. Eleven cetacean species were identified including eight odontocete species (killer whale, Orcinus orca; Pacific white-sideddolphin, Lagenorhynchus obliquidens; common dolphin, Delphinus spp.; bottlenose dolphin, Tursiops truncatus, northern right whale dolphin, Lissodelphis borealis; Risso’s dolphin, Grampus griseus; Dall’s porpoise, Phocoenoides dalli; and harbor porpoise, Phocoena phocoena)and three mysticete species (humpback whale, Megaptera novaeangliae; minke whale, Balaenoptera acutorostrata; andblue whale, Balaenoptera musculus). As expected, the detection of certain species among survey platforms (shore-based census watches, 25-power “Big Eye” binocular watches, and aerial surveys) was limited by species surfacing behavior and/or bathymetric preference. Comparisons among the shore-based census efforts showed a significant difference in sightings rates from 1967–84 (n = 14, mean= 0.11, SD = 0.11) to 1985–2007 (n = 11, mean = 1.48, SD = 0.47; t-Test: p < 0.001, df = 23). The warm period observedduring the 1990’s may partially explain the increase in sighting rates and diversity of species observed at the census site compared to the much cooler temperatures ofthe 1970’s. |
format |
Article in Journal/Newspaper |
author |
Shelden, Kim E. W. Rugh, David J. |
author_facet |
Shelden, Kim E. W. Rugh, David J. |
author_sort |
Shelden, Kim E. W. |
title |
Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
title_short |
Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
title_full |
Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
title_fullStr |
Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
title_full_unstemmed |
Forty Years of Winter: Cetaceans Observed During the Southbound Migration of Gray Whales, Eschrichtius robustus, Near Granite Canyon, Central California |
title_sort |
forty years of winter: cetaceans observed during the southbound migration of gray whales, eschrichtius robustus, near granite canyon, central california |
publishDate |
2010 |
url |
http://hdl.handle.net/1834/26276 |
long_lat |
ENVELOPE(-136.212,-136.212,62.850,62.850) |
geographic |
Granite Canyon Pacific |
geographic_facet |
Granite Canyon Pacific |
genre |
Balaenoptera acutorostrata Balaenoptera musculus Humpback Whale Killer Whale Megaptera novaeangliae minke whale Orca Orcinus orca Phocoena phocoena Killer whale |
genre_facet |
Balaenoptera acutorostrata Balaenoptera musculus Humpback Whale Killer Whale Megaptera novaeangliae minke whale Orca Orcinus orca Phocoena phocoena Killer whale |
op_source |
http://aquaticcommons.org/id/eprint/9668 403 2012-08-14 16:32:20 9668 United States National Marine Fisheries Service |
op_relation |
http://spo.nmfs.noaa.gov/mfr724/mfr7241.pdf 0090-1830 http://hdl.handle.net/1834/26276 |
_version_ |
1766366480778133504 |