Current global population size, post-whaling trend and historical trajectory of sperm whales
The sperm whale lives in most deep ice-free waters of the globe. It was targeted during two periods of whaling peaking in the 1840’s and 1960’s. Using a habitat suitability model, we extrapolated estimates of abundance from visual and acoustic surveys to give a global estimate of 736,053 sperm whale...
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ftpubmed:oai:pubmedcentral.nih.gov:9663694 2023-05-15T18:26:39+02:00 Current global population size, post-whaling trend and historical trajectory of sperm whales Whitehead, Hal Shin, Megan 2022-11-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9663694/ http://www.ncbi.nlm.nih.gov/pubmed/36376385 https://doi.org/10.1038/s41598-022-24107-7 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9663694/ http://www.ncbi.nlm.nih.gov/pubmed/36376385 http://dx.doi.org/10.1038/s41598-022-24107-7 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Sci Rep Article Text 2022 ftpubmed https://doi.org/10.1038/s41598-022-24107-7 2022-11-20T02:51:12Z The sperm whale lives in most deep ice-free waters of the globe. It was targeted during two periods of whaling peaking in the 1840’s and 1960’s. Using a habitat suitability model, we extrapolated estimates of abundance from visual and acoustic surveys to give a global estimate of 736,053 sperm whales (CV = 0.218) in 1993. Estimates of trends in the post-whaling era suggest that: whaling, by affecting the sex ratio and/or the social cohesion of females, reduced recovery rates well after whaling ceased; preferentially-targeted adult males show the best evidence of recovery, presumably due to recruitment from breeding populations; several decades post-whaling, sperm whale populations not facing much human impact are recovering slowly, but populations may be declining in areas with substantial anthropogenic footprint. A theta-logistic population model enhanced to simulate spatial structure and the non-removal impacts of whaling indicated a pre-whaling population of 1,949,698 (CV = 0.178) in 1710 being reduced by whaling, and then then recovering a little to about 844,761 (CV = 0.209) in 2022. There is much uncertainty about these numbers and trends. A larger population estimate than produced by a similar analysis in 2002 is principally due to a better assessment of ascertainment bias. Text Sperm whale PubMed Central (PMC) Scientific Reports 12 1 |
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Article Whitehead, Hal Shin, Megan Current global population size, post-whaling trend and historical trajectory of sperm whales |
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The sperm whale lives in most deep ice-free waters of the globe. It was targeted during two periods of whaling peaking in the 1840’s and 1960’s. Using a habitat suitability model, we extrapolated estimates of abundance from visual and acoustic surveys to give a global estimate of 736,053 sperm whales (CV = 0.218) in 1993. Estimates of trends in the post-whaling era suggest that: whaling, by affecting the sex ratio and/or the social cohesion of females, reduced recovery rates well after whaling ceased; preferentially-targeted adult males show the best evidence of recovery, presumably due to recruitment from breeding populations; several decades post-whaling, sperm whale populations not facing much human impact are recovering slowly, but populations may be declining in areas with substantial anthropogenic footprint. A theta-logistic population model enhanced to simulate spatial structure and the non-removal impacts of whaling indicated a pre-whaling population of 1,949,698 (CV = 0.178) in 1710 being reduced by whaling, and then then recovering a little to about 844,761 (CV = 0.209) in 2022. There is much uncertainty about these numbers and trends. A larger population estimate than produced by a similar analysis in 2002 is principally due to a better assessment of ascertainment bias. |
format |
Text |
author |
Whitehead, Hal Shin, Megan |
author_facet |
Whitehead, Hal Shin, Megan |
author_sort |
Whitehead, Hal |
title |
Current global population size, post-whaling trend and historical trajectory of sperm whales |
title_short |
Current global population size, post-whaling trend and historical trajectory of sperm whales |
title_full |
Current global population size, post-whaling trend and historical trajectory of sperm whales |
title_fullStr |
Current global population size, post-whaling trend and historical trajectory of sperm whales |
title_full_unstemmed |
Current global population size, post-whaling trend and historical trajectory of sperm whales |
title_sort |
current global population size, post-whaling trend and historical trajectory of sperm whales |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9663694/ http://www.ncbi.nlm.nih.gov/pubmed/36376385 https://doi.org/10.1038/s41598-022-24107-7 |
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Sperm whale |
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Sperm whale |
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Sci Rep |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9663694/ http://www.ncbi.nlm.nih.gov/pubmed/36376385 http://dx.doi.org/10.1038/s41598-022-24107-7 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41598-022-24107-7 |
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