La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Optimising the timing of visual surveys of crabeater seal abundance: haulout behaviour as a consideration
Auteurs :	C. Southwell, Auteur
Type de document :	Article
Dans :	Wildlife Research (32(4) 2005)
Article en page(s) :	333-338
Langues:	Anglais
Résumé :	The most practical means of estimating pack-ice seal abundance is by conducting visual surveys from ships and aircraft. However, only those seals hauled out on the ice are 'available' to such surveys, and additional information on haulout behaviour is required to adjust counts of seals on the ice to estimate the total population size. Consideration of the optimal time to undertake visual surveys with respect to availability is important to ensure that bias and uncertainty in the abundance estimate are minimised for a fixed survey effort. In order to assess the optimal time for conducting visual surveys of crabeater seals (Lobodon carcinophaga), satellite-linked dive recorders were attached to

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