{"refrec":{"BRefID":359466,"RR":"<b>Whitehead, H.; Shin, M.</b> (2022). Current global population size, post-whaling trend and historical trajectory of sperm whales. <i>NPG Scientific Reports 12(1)</i>: 19468. <a href=\"https://dx.doi.org/10.1038/s41598-022-24107-7\" target=\"_blank\">https://dx.doi.org/10.1038/s41598-022-24107-7</a>","BEntID":357181,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>NPG Scientific Reports 12(1)</i>: 19468. <a href=\"https://dx.doi.org/10.1038/s41598-022-24107-7\" target=\"_blank\">https://dx.doi.org/10.1038/s41598-022-24107-7</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Whitehead, H.; Shin, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Whitehead, H.; Shin, M.","Englishabstract":"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.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Current global population size, post-whaling trend and historical trajectory of sperm whales","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-05 01:31:29.238464","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2022,"MonPub":null,"DateUpdate":"2022-11-24","DateCreate":"2022-11-24","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000883823800021","VABBcode":null,"OpenAcc":1,"DOI":"10.1038/s41598-022-24107-7"},"refs":null,"anarec":{"AnaID":359466,"PubliDate":2022,"Pagination":"19468","XtraPublOfAnaID":null,"ISBN":null,"Volume":"12","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":208093,"SerRR":"Scientific Reports (Nature Publishing Group). 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