La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Inferring functional extinction based on sighting records
Auteurs :	Ivan Jaric, Auteur ; Joern Gessner, Auteur ; Andrew R. Solow, Auteur
Type de document :	Article
Dans :	Biological Conservation (199 JUL 2016)
Article en page(s) :	84-87
Langues:	Anglais
Résumé :	The term functional extinction is used to describe a permanent failure of reproduction or recruitment in a population. Functional extinction results in a truncation of the age distribution, but this can be very difficult to detect in poorly studied populations. Here, we describe a novel statistical method for detecting functional extinction based on a sighting record of individuals of known or estimated ages. The method is based on a simple population dynamic model and simulation results show that it works well even with limited data. The method is illustrated using a sighting record of the ship sturgeon (Acipenser nudiventris) in the Danube River. The results indicate that this population is functionally extinct, most likely by 2002. Management implications of this finding are discussed. (C) 2016 Elsevier Ltd. All rights reserved.

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