Humpback whale abundance in the North Pacific estimated by photographic capture‐recapture with bias correction from simulation studies
Abstract 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. B...
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crwiley:10.1111/j.1748-7692.2010.00444.x 2024-09-30T14:36:19+00:00 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. Rojas‐Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. Urbán R., Jorge Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami 2011 http://dx.doi.org/10.1111/j.1748-7692.2010.00444.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2010.00444.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2010.00444.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 27, issue 4, page 793-818 ISSN 0824-0469 1748-7692 journal-article 2011 crwiley https://doi.org/10.1111/j.1748-7692.2010.00444.x 2024-09-05T05:05:52Z Abstract 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. Article in Journal/Newspaper Humpback Whale Wiley Online Library Pacific Marine Mammal Science 27 4 793 818 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract 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 |
Article in Journal/Newspaper |
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. Rojas‐Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. Urbán R., Jorge Wade, Paul Weller, David Witteveen, Briana H. Yamaguchi, Manami |
spellingShingle |
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. Rojas‐Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. Urbán R., Jorge 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 |
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. Rojas‐Bracho, Lorenzo Straley, Janice M. Taylor, Barbara L. Urbán R., Jorge 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 |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2010.00444.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2010.00444.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2010.00444.x |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Humpback Whale |
genre_facet |
Humpback Whale |
op_source |
Marine Mammal Science volume 27, issue 4, page 793-818 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2010.00444.x |
container_title |
Marine Mammal Science |
container_volume |
27 |
container_issue |
4 |
container_start_page |
793 |
op_container_end_page |
818 |
_version_ |
1811639402866147328 |