La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	When do falls rush in? Notes on the timing and frequency of falls in north Norfolk and on Fair Isle
Auteurs :	Richard Aspinall, Auteur
Type de document :	Article
Dans :	British Birds (107(5) MAY 2014)
Article en page(s) :	286-297
Résumé :	Records of falls of thrushes in north Norfolk in autumn, and falls of all passerine species on Fair Isle in both spring and autumn, were analysed to establish dates and frequency of falls. A total of 106 days of recorded thrush falls in north Norfolk during autumn, for periods dating back as far as 1880, shows that these occur most frequently in the second half of October. A total of 839 falls over a 60-year period for Fair Isle shows that falls occur throughout both spring and autumn but are more than twice as frequent in autumn. The timing of falls involving different species on Fair Isle clearly shows the sequence of migration in spring and autumn for different species.

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