Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance
The results of a double-marking experiment using natural markings and microsatellite genetic markers to identify humpback whales (Megaptera novaeangliae) confirm that natural markings are a reliable means of identifying individuals on a large scale. Of 1410 instances of double tagging, there were 41...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f01-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-131 |
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crcansciencepubl:10.1139/f01-131 2024-09-15T18:18:27+00:00 Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance Stevick, Peter T Palsbøll, Per J Smith, Tim D Bravington, Mark V Hammond, Philip S 2001 http://dx.doi.org/10.1139/f01-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-131 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 9, page 1861-1870 ISSN 0706-652X 1205-7533 journal-article 2001 crcansciencepubl https://doi.org/10.1139/f01-131 2024-06-27T04:11:01Z The results of a double-marking experiment using natural markings and microsatellite genetic markers to identify humpback whales (Megaptera novaeangliae) confirm that natural markings are a reliable means of identifying individuals on a large scale. Of 1410 instances of double tagging, there were 414 resightings. No false positive and 14 false negative errors were identified. The rate of error increased with decreasing photographic quality; no errors were observed among photographs of the highest quality rating, whereas an error rate of 0.125 was identified in sightings for which only part of the area used for identification was visible. There was also a weaker relationship between error rate and the distinctiveness of markings, which may result from non-independence in coding for image quality and distinctiveness. A correction is developed for the Petersen two-sample abundance estimator to account for false negative errors in identification, and a parametric bootstrap procedure for estimation of variance is also developed. In application to abundance estimates from the North Atlantic, the correction reduces the bias in estimates made using poorer quality photographs to a negligible level while maintaining comparable precision. Article in Journal/Newspaper Megaptera novaeangliae North Atlantic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 58 9 1861 1870 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The results of a double-marking experiment using natural markings and microsatellite genetic markers to identify humpback whales (Megaptera novaeangliae) confirm that natural markings are a reliable means of identifying individuals on a large scale. Of 1410 instances of double tagging, there were 414 resightings. No false positive and 14 false negative errors were identified. The rate of error increased with decreasing photographic quality; no errors were observed among photographs of the highest quality rating, whereas an error rate of 0.125 was identified in sightings for which only part of the area used for identification was visible. There was also a weaker relationship between error rate and the distinctiveness of markings, which may result from non-independence in coding for image quality and distinctiveness. A correction is developed for the Petersen two-sample abundance estimator to account for false negative errors in identification, and a parametric bootstrap procedure for estimation of variance is also developed. In application to abundance estimates from the North Atlantic, the correction reduces the bias in estimates made using poorer quality photographs to a negligible level while maintaining comparable precision. |
format |
Article in Journal/Newspaper |
author |
Stevick, Peter T Palsbøll, Per J Smith, Tim D Bravington, Mark V Hammond, Philip S |
spellingShingle |
Stevick, Peter T Palsbøll, Per J Smith, Tim D Bravington, Mark V Hammond, Philip S Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
author_facet |
Stevick, Peter T Palsbøll, Per J Smith, Tim D Bravington, Mark V Hammond, Philip S |
author_sort |
Stevick, Peter T |
title |
Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
title_short |
Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
title_full |
Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
title_fullStr |
Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
title_full_unstemmed |
Errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
title_sort |
errors in identification using natural markings: rates, sources, and effects on capturerecapture estimates of abundance |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f01-131 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-131 |
genre |
Megaptera novaeangliae North Atlantic |
genre_facet |
Megaptera novaeangliae North Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 9, page 1861-1870 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-131 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
9 |
container_start_page |
1861 |
op_container_end_page |
1870 |
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1810456578032140288 |