La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Trend detection in a boat-based method for monitoring sirenians: Antillean manatee case study (2012)
Auteurs :	Katherine S. LaCommare, Auteur ; Solange Brault, Auteur ; Caryn Self-Sullivan, Auteur ; Ellen M. Hines, Auteur
Type de document :	Article
Dans :	Biological Conservation (152 AUG 2012)
Article en page(s) :	169-177
Langues:	Anglais
Résumé :	Accurate monitoring is a critical step in evaluating the conservation and management needs of endangered species. We evaluated a low cost, effective survey method for monitoring West Indian manatees (Trichechus manatus manatus) in Belize, Central America. The objectives for this paper are (1) to evaluate a count-based population index derived from a boat-based survey method, (2) to examine trends in manatee abundance in the Drowned Cayes area, (3) to conduct a power analysis to explore our ability to detect a trend and the ramifications of survey structure on trend detection. We used a generalized linear model to evaluate the impact of environmental conditions on sighting probability and to determine whether the number of manatees observed per 20-min scan changed from 2001 to 2007. We used simulations to determine statistical power - the ability to detect potential declines of 10%, 25% or 50% over

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...