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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Bird Ringing in Britain and Ireland in 1997
Auteurs :	Mike P. Toms, Auteur ; Jacquie A. Clark, Auteur ; Dawn E. Balmer, Auteur
Type de document :	Article
Dans :	Ringing & Migration (19(3) May, 1999)
Article en page(s) :	215-255
Résumé :	This is the 61st annual report of the British Trust for Ornithology's Ringing Scheme, presenting research carried out and data received in 1997. Work examining the survival rates of 31 farmland passerines in relation to long-term changes in abundance suggested that changes in survival rates for 16 species had, to some extent, influenced their abundance. This was particularly important for a number of declining species. Other research examined the post-release survival of oiled, cleaned and rehabilitated Guillemots and demonstrated that these Guillemots had lower annual survival rates than non-oiled, non-rehabilitated birds. Important recommendations about the future monitoring of the effects of rehabilitating oiled seabirds were made as a result of this work. A review of avian survival rates was also carried out in 1997, which brought together reliable survival rates for 115 species. The successful launch of the Retrapping Adults for Survival (RAS) Project is reported, together with anoutline of its methods. This project aims to gather important data on the survival of a wide range of species in the UK, using targeted trapping for specific species and mark-recapture analyses. Data collected from the Constant Effort Sites (CES) Scheme indicated that the 1997 breeding season was better than that in 1996 for the majority of passerine species monitored. However, significantly fewer adult birds were caught at Constant Effort (CE) sites in 1997 than in 1996 for four resident insectivores (Wren, Robin, Blackbird and Song Thrush), one resident seed-eater (Bullfinch) and three trans-Saharan migrants (Sedge Warbler, Reed Warbler and Whitethroat). The declines in adult numbers for four of the 'Red-listed' species (Song Thrush, Linnet, Bullfinch and Reed Bunting) continued. Long-term declines in adult catches of Blackbird and Song Thrush on CE sites were found to be similar, possibly suggesting similar causal factors. The value of the CES Scheme was further demonstrated by a new analysis examining long-term trends in abundance of species monitored on

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