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- Title
Age- and sex-specific survival estimates incorporating tag loss for New Zealand sea lions, Phocarctos hookeri.
- Authors
CHILVERS, B. LOUISE; MACKENZIE, DARRYL I.
- Abstract
The estimation of life-history parameters for a threatened species is important for understanding its biology and helping to determine management options. This research investigates age- and sex-related survival estimates incorporating tag loss for New Zealand (NZ) sea lions (Phocarctos hookeri) from Sandy Bay, Enderby Island, Auckland Islands, New Zealand, using multistate mark-recapture data from known-age individuals over 8 years (1997-1998 to 2005-2006). Survival estimates and tag loss rates differed significantly by sex and age class, with adult males having the lowest tag retention of any age or sex class and females ≥ 3 years old having lower survival estimates than their male counterparts. The variability and lower female survival relative to males is a critical problem for NZ sea lions, because even small changes in adult female survival significantly affect population trends for such large, long-lived mammals.
- Subjects
NEW Zealand; SEA lions; ENDANGERED species; POPULATION dynamics; ANIMAL populations; WILDLIFE conservation
- Publication
Journal of Mammalogy, 2010, Vol 91, Issue 3, p758
- ISSN
0022-2372
- Publication type
Article
- DOI
10.1644/09-MAMM-A-285.1