La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Survival rates of adult Reed Warblers Acrocephatus scirpaceus at a northern and southern site in England
Auteurs :	Chris B. Thaxter, Auteur ; Chris P. F. Redfern, Auteur ; Richard M. Bevan, Auteur
Type de document :	Article
Dans :	Ringing & Migration (23(Part 2) DEC 2006)
Article en page(s) :	65-79
Résumé :	Mark-recapture ringing data from Wicken Fen in Cambridgeshire and Gosforth Park in Newcastle upon Tyne were used to estimate adult survival rates in a southerly and a northerly population of Reed Warblers in England. The computer program MARK was used to estimate survival and recapture rates, adjusted for transient birds, with respect to sexes at each site. Expressed as percentages, survival rates between 1988 and 2004 at the northerly Gosforth Park site were 60.3 +/- 6.0 (se) for males and 54.9 +/- 10.3 for females. Survival rates at the southerly Wicken Fen site between 1995 and 2004 were 32.9 +/- 16.0 for males and 52.0 +/- 22.4 for females. Rainfall in the Sahel region of West Africa did not account for variation in survival rates over time at either site and did not correlate with variation in adult Reed Warbler abundance in the UK. At both Wickert Fen and Gosforth Park, Reed Warbler populations increased during the study periods. At Wickert Fen, new recruits due to immigration had a greater contribution to population growth than survival of adults returning to the site, whereas at Gosforth Park the reverse was found.

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