Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data

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dc.contributor.authorBranch, Trevor A
dc.contributor.authorMikhalev, Y A
dc.date.accessioned2016-03-22T08:18:48Z
dc.date.available2016-03-22T08:18:48Z
dc.date.issued2008
dc.date.updated2016-02-25T09:04:18Z
dc.description.abstractNew blue whale ovarian corpora data from illegal Soviet catches in the Southern Hemisphere and northern Indian Ocean were recovered from the original logbooks. Catches north of 52°S were assumed to be pygmy blue whales (Balaenoptera musculus brevicauda, n= 1,272); those south of 56°S were assumed to be Antarctic (true) blue whales (B. m. intermedia, n= 153). Three probable Antarctic blue whales north of 52°S were excluded. Lengths at which 50% and 95% of females become sexually mature (L50 and L95) were estimated from a Bayesian logistic model. These estimates are more precise than previous Japanese estimates because Soviet catches below the legal minimum of 70 ft (21.3 m) were 32 times greater. For pygmy blue whales L50 was 19.2 m (95% interval 19.1–19.3 m) and L95 was 20.5 m (95% interval 20.4–20.7 m). Antarctic L50 (23.4 m, 95% interval 22.9–23.9 m) was much longer than L50 for pygmy blue whale regions (18.4–19.9 m). The median L50 for the northern Indian Ocean was 0.5–0.6 m shorter than for pygmy blue whales from other regions; although statistically significant, these small length differences provide little support for northern Indian Ocean blue whales being a separate subspecies, B. m. indica.en_ZA
dc.identifierhttp://dx.doi.org/10.1111/j.1748-7692.2008.00214.x
dc.identifier.apacitationBranch, T. A., & Mikhalev, Y. A. (2008). Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data. <i>Marine Mammal Science</i>, http://hdl.handle.net/11427/18140en_ZA
dc.identifier.chicagocitationBranch, Trevor A, and Y A Mikhalev "Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data." <i>Marine Mammal Science</i> (2008) http://hdl.handle.net/11427/18140en_ZA
dc.identifier.citationBranch, T. A., & Mikhalev, Y. A. (2008). Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data. Marine Mammal Science, 24(3), 690-703.en_ZA
dc.identifier.issn0824-0469en_ZA
dc.identifier.ris TY - Journal Article AU - Branch, Trevor A AU - Mikhalev, Y A AB - New blue whale ovarian corpora data from illegal Soviet catches in the Southern Hemisphere and northern Indian Ocean were recovered from the original logbooks. Catches north of 52°S were assumed to be pygmy blue whales (Balaenoptera musculus brevicauda, n= 1,272); those south of 56°S were assumed to be Antarctic (true) blue whales (B. m. intermedia, n= 153). Three probable Antarctic blue whales north of 52°S were excluded. Lengths at which 50% and 95% of females become sexually mature (L50 and L95) were estimated from a Bayesian logistic model. These estimates are more precise than previous Japanese estimates because Soviet catches below the legal minimum of 70 ft (21.3 m) were 32 times greater. For pygmy blue whales L50 was 19.2 m (95% interval 19.1–19.3 m) and L95 was 20.5 m (95% interval 20.4–20.7 m). Antarctic L50 (23.4 m, 95% interval 22.9–23.9 m) was much longer than L50 for pygmy blue whale regions (18.4–19.9 m). The median L50 for the northern Indian Ocean was 0.5–0.6 m shorter than for pygmy blue whales from other regions; although statistically significant, these small length differences provide little support for northern Indian Ocean blue whales being a separate subspecies, B. m. indica. DA - 2008 DB - OpenUCT DP - University of Cape Town J1 - Marine Mammal Science KW - Balaenoptera musculus brevicauda KW - Balaenoptera musculus intermedia KW - Balaenoptera musculus indica KW - illegal whaling KW - Bayesian KW - true blue whales KW - corpora lutea KW - corpora albicantia LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 SM - 0824-0469 T1 - Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data TI - Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data UR - http://hdl.handle.net/11427/18140 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18140
dc.identifier.urihttp://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2008.00214.x/abstract
dc.identifier.vancouvercitationBranch TA, Mikhalev YA. Regional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling data. Marine Mammal Science. 2008; http://hdl.handle.net/11427/18140.en_ZA
dc.languageengen_ZA
dc.publisherSociety for Marine Mammalogyen_ZA
dc.publisher.departmentMarine Resource Assessment and Management Groupen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.sourceMarine Mammal Scienceen_ZA
dc.source.urihttp://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1748-7692
dc.subjectBalaenoptera musculus brevicauda
dc.subjectBalaenoptera musculus intermedia
dc.subjectBalaenoptera musculus indica
dc.subjectillegal whaling
dc.subjectBayesian
dc.subjecttrue blue whales
dc.subjectcorpora lutea
dc.subjectcorpora albicantia
dc.titleRegional differences in length at sexual maturity for female blue whales based on recovered Soviet whaling dataen_ZA
dc.typeJournal Articleen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceArticleen_ZA
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