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Résumé :
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Changes in the phenology of species can be seen across taxonomic groups, and many migratory birds have advanced their spring arrival. In this study a long-term bird-ringing data set was used to show that Eurasian Blackcap Sylvia atricapilla, Eurasian Reed Warbler Acrocephalus scirpaceus and Common Chiffchaff Phylloscopus collybita have all advanced their spring arrival at Wicken Fen. However, Willow Warbler P. trochilus and Sedge Warbler A. schoenobaenus have not significantly altered their arrival date at the site. Comparing these two species to their congeners that were shown to be arriving earlier, it was found that the relative abundance of Reed Warbler and Chiffchaff had increased in annual catch statistics compared to Sedge Warbler and Willow Warbler. The implications of these data are discussed, and highlight how the ability of local populations to respond to environmental changes might impact local population dynamics, and potentially even future localised extinctions.
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