La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Colonization patterns at Rook Corvus frugilegus colonies: implications for survey strategies (1999)
Auteurs :	L. R. Griffin, Auteur
Type de document :	Article
Dans :	Bird Study (46(Suppl.) 1999)
Article en page(s) :	170-173
Langues:	Anglais
Résumé :	The increase in Rook Corvus frugilegus L. nest numbers at 18 colonies in County Durham, UK was monitored during the spring period of colony build-up. Nests were mapped to avoid miscounts and to track the stages of nest completion. Colonies were asynchronous in reaching maximum numbers, although all followed the same general pattern. Despite large variation in initial colony size on 1 April, a constant proportional increase up to the modal date of maximum counts on 22 April was recorded. The implications for survey strategy are discussed.

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