4.2 Article

Age- and sex-specific survival estimates incorporating tag loss for New Zealand sea lions, Phocarctos hookeri

Journal

JOURNAL OF MAMMALOGY
Volume 91, Issue 3, Pages 758-767

Publisher

OXFORD UNIV PRESS INC
DOI: 10.1644/09-MAMM-A-285.1

Keywords

Auckland Islands; demography; fisheries interactions; management; mark-recapture method; multistate model; Phocarctos hookeri; New Zealand sea lion; New Zealand's subantarctic; population dynamics

Categories

Funding

  1. New Zealand Department of Conservation
  2. Department of Conservation [POP2006/01]

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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. DOI: 10.1644/09-MAMM-A-285.1.

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