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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Evening mist-net closure: Implications for data collection and bird welfare
Auteurs :	A. Sorace, Auteur ; M. Gustin, Auteur ; G. Landucci, Auteur
Type de document :	Article
Dans :	Ringing & Migration (20(4) November, 2001)
Article en page(s) :	371-376
Résumé :	Wild birds captured with mist-nets for study purposes should be released and returned to the wild as soon as possible to reduce the stress of being handled. Studies of migratory birds involving mist-netting for 24h/day may result in diurnal birds being caught late in the day and kept overnight. This may be particularly detrimental to migrants stressed by migratory flight and to sedentary birds during reproduction. The closure of mist-nets in the evening may avoid these problems, but is believed to severely reduce the amount of data collected. In this study we show that the evening closure of mist-nets does not translate into a significant reduction in captures of migrants because the number of migrants captured in the evening is low, and the reopening of mist-nests before sunrise does not reduce the captures in the following diurnal hours. The evening closure of mist-nets reduced disturbance because it avoided keeping both nocturnal migrants (including those which were about to leave the study area) and sedentary birds overnight. Therefore, mist-nets may be closed in the evening without jeopardising the success of a study. The loss of data caused by the evening closure of mist-nets may however be significant for the few species with partially or completely crepuscular activity such as the Nightingale, Luscinia megarynchos.

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