Journal Title
Title of Journal: Polar Biol
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Abbravation: Polar Biology
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Publisher
Springer Berlin Heidelberg
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Authors: Bruce C Robertson
Publish Date: 2014/11/11
Volume: 38, Issue: 4, Pages: 539-546
Abstract
Pup production of the ‘nationally critical’ New Zealand sea lion Phocarctos hookeri has declined by 48 since 1998 with fisheries bycatch playing a role in this decline Current management of the sea lion population involves amongst other measures the setting of an annual bycatch limit based on Bayesian modelling of the sea lion population and fisheries information Success of management scenarios is determined against two criteria both of which involve keeping the sea lion population at or above 90 of a modelled carrying capacity 6987 mature individuals Due to a lack of information on the presealing abundance of the New Zealand sea lion it is unclear whether the modelled carrying capacity represents a cap on sea lion recovery Here I use published estimates of genetic diversity based on microsatellite loci expected heterozygosity H e of the New Zealand sea lion and other otariid species to estimate historical effective population size N e I then use existing knowledge of the ratio of N e to census population size N C to determine a historical census population size of these species Genetical estimates of historical N e suggest that NZ sea lions were considerably more abundant 68000 individuals historically than the current population estimate 11855 animals Importantly the genetical estimate of historical population size suggests that the modelled carrying capacity 6987 mature sea lions is likely an underestimation of recovery potential of the species hence current management maybe limiting the recovery of the speciesI thank Amelie Auge Catherine Collins Nicolas Dussex Catherine Grueber and Fiona Robertson for helpful discussion and three reviewers for helpful comments on the manuscript This research was supported by funding from the New Zealand Department of Conservation Grant No 4219 and Department of Zoology University of Otago
Keywords:
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- Heat hardening in Antarctic notothenioid fishes
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