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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Using simple species lists to monitor trends in animal populations: new methods and a comparison with independent data
Auteurs :	R. L. Roberts, Auteur ; P. F. Donald, Auteur ; R. E. Green, Auteur
Type de document :	Article
Dans :	Animal Conservation (10(3) AUG 2007)
Article en page(s) :	332-339
Résumé :	There is an urgent need to develop simple and inexpensive methods for monitoring wildlife populations in resource-poor countries. List-based methods have been advocated as simple yet potentially useful biodiversity monitoring tools, and systems have recently been launched in a number of countries to collect species lists. We attempt to advance the use of systematic list-based monitoring by (1) suggesting improvements to the way in which list reporting rates are calculated; (2) assessing the extent to which degrading effort-corrected measures of abundance into simple species lists results in loss of information on population trends; (3) comparing long-term trends in list reporting rates with population trends from a wholly independent monitoring scheme. Daily species lists of birds were derived from regular trapping at a nature reserve in southern England. Most species showed a strong correlation across years between the proportion of lists on which they occurred, adjusted for list length (adjusted list reporting rate; ALRR), and an effort-corrected measure of abundance (captures per unit effort; CPUE). ALRR revealed almost as much about annual variation in abundance as CPUE for all but the most frequently captured species. Long-term (>

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