La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	An index of reproductive activity provides an accurate estimate of the reproductive success of Palm Warblers
Auteurs :	Sylvain Bonifait, Auteur ; Marc-Andre Villard, Auteur ; David Paulin, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (77(3) SUM 2006)
Article en page(s) :	302-309
Langues:	Anglais
Résumé :	Various indices of reproductive activity (IRA) have been used to estimate the reproductive success of songbirds. However, the performance of IRAs varies among systems examined, and this approach still requires more effort than standard surveys. We tested the accuracy of an IRA in a survey of birds nesting in bogs in eastern New Brunswick, Canada. We compared an IRA obtained through point counts with playbacks ("extensive" IRA) to another IRA obtained through intensive searches for evidence of breeding ("intensive" IRA) by Palm Warblers (Dendroica palmarum). Both the extensive IRA and associated abundance index were correlated with the intensive IRA, the former correlation being stronger. However, the extensive IRA tended to underestimate the status of breeding birds and overestimate the statu of no reproducing individuals that behaved more conspicuously. Nonetheless, the extensive IRA obtained using song playbacks represents a time-efficient alternative to intensive nest monitoring when estimating habitat quality at the scale of small (0.78 ha) study plots.

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