Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies
We estimated the abundance of humpback whales in the North Pacific by capture recapture methods using over 18,000 fluke identification photographs collected in 2004–2006. Our best estimate of abundance was 21,808 (CV=0.04). We estimated the biases in this value using a simulation model. Births and d...
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2011
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ftunivnebraskali:oai:digitalcommons.unl.edu:usdeptcommercepub-1238 2023-11-12T04:18:19+01:00 Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies Barlow, Jay Calambokidis, John Falcone, Erin A. Baker, C. Scott Burdin, Alexander M. Clapham, Phillip J. Ford, John K. B. Gabriele, Christine M. LeDuc, Richard Mattila, David K. Quinn, Terrance J., II Rojas-Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. R., Jorge Urbán Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami 2011-01-01T08:00:00Z application/pdf https://digitalcommons.unl.edu/usdeptcommercepub/239 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1238/viewcontent/Barlow_MMS_2011_Humpback_whale_abundance.pdf unknown DigitalCommons@University of Nebraska - Lincoln https://digitalcommons.unl.edu/usdeptcommercepub/239 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1238/viewcontent/Barlow_MMS_2011_Humpback_whale_abundance.pdf Publications, Agencies and Staff of the U.S. Department of Commerce humpback whale Megaptera novaeangliae North Pacific abundance photo-identification capture-recapture bias simulation model Environmental Sciences text 2011 ftunivnebraskali 2023-10-30T10:51:17Z We estimated the abundance of humpback whales in the North Pacific by capture recapture methods using over 18,000 fluke identification photographs collected in 2004–2006. Our best estimate of abundance was 21,808 (CV=0.04). We estimated the biases in this value using a simulation model. Births and deaths, which violate the assumption of a closed population, resulted in a bias of +5.2%, exclusion of calves in samples resulted in a bias of−10.5%, failure to achieve random geographic sampling resulted in a bias of −0.4%, and missed matches resulted in a bias of +9.3%. Known sex-biased sampling favoring males in breeding areas did not add significant bias if both sexes are proportionately sampled in the feeding areas. Our best estimate of abundance was 21,063 after accounting for a net bias of +3.5%. This estimate is likely to be lower than the true abundance due to two additional sources of bias: individual heterogeneity in the probability of being sampled (unquantified) and the likely existence of an unknown and unsampled breeding area (−8.7%). Results confirm that the overall humpback whale population in the North Pacific has continued to increase and is now greater than some prior estimates of prewhaling abundance. Text Humpback Whale Megaptera novaeangliae University of Nebraska-Lincoln: DigitalCommons@UNL Pacific |
institution |
Open Polar |
collection |
University of Nebraska-Lincoln: DigitalCommons@UNL |
op_collection_id |
ftunivnebraskali |
language |
unknown |
topic |
humpback whale Megaptera novaeangliae North Pacific abundance photo-identification capture-recapture bias simulation model Environmental Sciences |
spellingShingle |
humpback whale Megaptera novaeangliae North Pacific abundance photo-identification capture-recapture bias simulation model Environmental Sciences Barlow, Jay Calambokidis, John Falcone, Erin A. Baker, C. Scott Burdin, Alexander M. Clapham, Phillip J. Ford, John K. B. Gabriele, Christine M. LeDuc, Richard Mattila, David K. Quinn, Terrance J., II Rojas-Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. R., Jorge Urbán Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
topic_facet |
humpback whale Megaptera novaeangliae North Pacific abundance photo-identification capture-recapture bias simulation model Environmental Sciences |
description |
We estimated the abundance of humpback whales in the North Pacific by capture recapture methods using over 18,000 fluke identification photographs collected in 2004–2006. Our best estimate of abundance was 21,808 (CV=0.04). We estimated the biases in this value using a simulation model. Births and deaths, which violate the assumption of a closed population, resulted in a bias of +5.2%, exclusion of calves in samples resulted in a bias of−10.5%, failure to achieve random geographic sampling resulted in a bias of −0.4%, and missed matches resulted in a bias of +9.3%. Known sex-biased sampling favoring males in breeding areas did not add significant bias if both sexes are proportionately sampled in the feeding areas. Our best estimate of abundance was 21,063 after accounting for a net bias of +3.5%. This estimate is likely to be lower than the true abundance due to two additional sources of bias: individual heterogeneity in the probability of being sampled (unquantified) and the likely existence of an unknown and unsampled breeding area (−8.7%). Results confirm that the overall humpback whale population in the North Pacific has continued to increase and is now greater than some prior estimates of prewhaling abundance. |
format |
Text |
author |
Barlow, Jay Calambokidis, John Falcone, Erin A. Baker, C. Scott Burdin, Alexander M. Clapham, Phillip J. Ford, John K. B. Gabriele, Christine M. LeDuc, Richard Mattila, David K. Quinn, Terrance J., II Rojas-Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. R., Jorge Urbán Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami |
author_facet |
Barlow, Jay Calambokidis, John Falcone, Erin A. Baker, C. Scott Burdin, Alexander M. Clapham, Phillip J. Ford, John K. B. Gabriele, Christine M. LeDuc, Richard Mattila, David K. Quinn, Terrance J., II Rojas-Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. R., Jorge Urbán Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami |
author_sort |
Barlow, Jay |
title |
Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
title_short |
Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
title_full |
Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
title_fullStr |
Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
title_full_unstemmed |
Humpback whale abundance in the North Pacific estimated by photographic capture-recapture with bias correction from simulation studies |
title_sort |
humpback whale abundance in the north pacific estimated by photographic capture-recapture with bias correction from simulation studies |
publisher |
DigitalCommons@University of Nebraska - Lincoln |
publishDate |
2011 |
url |
https://digitalcommons.unl.edu/usdeptcommercepub/239 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1238/viewcontent/Barlow_MMS_2011_Humpback_whale_abundance.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Humpback Whale Megaptera novaeangliae |
genre_facet |
Humpback Whale Megaptera novaeangliae |
op_source |
Publications, Agencies and Staff of the U.S. Department of Commerce |
op_relation |
https://digitalcommons.unl.edu/usdeptcommercepub/239 https://digitalcommons.unl.edu/context/usdeptcommercepub/article/1238/viewcontent/Barlow_MMS_2011_Humpback_whale_abundance.pdf |
_version_ |
1782334961099997184 |