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Critically low abundance and limits to human-related mortality for the Maui's dolphin Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/z316q5959

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  • The New Zealand endemic Maui’s dolphin Cephalorhynchus hectori maui is characterized by several life history traits thought to be important predictors of extinction risk in marine mammals, including a slow rate of reproduction, small geographic range, small group size, and coastal distribution. We continued the genetic monitoring of the remnant population of Maui’s dolphins using DNA profiles to identify 39 individuals from 73 skin biopsy samples collected during dedicated boat surveys in the austral summers of 2010 and 2011. Using a 2-sample, closed-population model with the genotype recapture records, we estimated the current abundance to be N = 55 individuals approximately age 1+ (95% confidence limits = 48, 69; coefficient of variation = 0.15). The endangered species potential biological removal that would permit the recovery of the Maui’s dolphin was calculated to be 1 dolphin every 10 to 23 yr. Despite this, the Maui’s dolphin is not necessarily doomed to extinction. It appears to be maintaining an equal sex ratio and connectivity within its remnant range and has the potential for rescue by interbreeding with Hector’s dolphin C. h. hectori migrants.
  • Keywords: Potential biological removal, New Zealand, Genotype mark-recapture, Critically endangered, Abundance, Cetacean, Cephalorhynchus hectori maui
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  • Hamner, R. M., Wade, P., Oremus, M., Stanley, M., Brown, P., Constantine, R., & Baker, C. S. (2014). Critically low abundance and limits to human-related mortality for the Maui’s dolphin. Endangered Species Research, 26(1), 87-92. doi:10.3354/esr00621
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  • 26
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  • 1
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  • This work was funded by the New Zealand Department of Conservation and completed under UniServices Contracts 17095 and 30642.
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  • description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2015-12-14T16:18:52Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HamnerRebeccaHMSCCriticallyLowAbundance.pdf: 471152 bytes, checksum: 0ab445d5a1cba9adec9ae145885e56ec (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2015-12-14T16:19:18Z (GMT) No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HamnerRebeccaHMSCCriticallyLowAbundance.pdf: 471152 bytes, checksum: 0ab445d5a1cba9adec9ae145885e56ec (MD5)
  • description.provenance : Made available in DSpace on 2015-12-14T16:19:18Z (GMT). No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) HamnerRebeccaHMSCCriticallyLowAbundance.pdf: 471152 bytes, checksum: 0ab445d5a1cba9adec9ae145885e56ec (MD5) Previous issue date: 2014

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