IUCN Red List Assessment
Red List Category Year Assessed
Endangered Red List Criteria
Reeves, R.R., Dawson, S.M., Jefferson, T.A., Karczmarski, L., Laidre, K., O’Corry-Crowe, G., Rojas-Bracho, L., Secchi, E.R., Slooten, E., Smith, B.D., Wang, J.Y. & Zhou, K. Reviewer/s
Brownell Jr., R.L. & Cooke, J. (Cetacean Red List Authority) Contributor/s Justification
This species is considered to be Endangered A4d due to an ongoing and projected decline of greater than 50% over 3 generations (approx. 39 years, Slooten et al
. 2000) considering both the past and the future. It is also important to consider that although its extent of occurrence and area of occupancy likely exceed the thresholds for criteria B1, B2 and D2, Hector’s dolphin has the most limited range of any marine cetacean other than the vaquita (Phocoena sinus
). In a population viability analysis, the estimated rate of decline was 74% over 3 generations where the time period under consideration was from 1970-2009 (Slooten 2007). The main cause of population decline is ongoing bycatch in fisheries.