La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Corvid survey techniques and the relationship between corvid relative abundance and nest predation
Auteurs :	J. M. Luginbuhl, Auteur ; J. M. Marzluff, Auteur ; J. E. Bradley, Auteur ; M. G. Raphael, Auteur ; D. E. Varland, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (72(4) FAL 2001)
Article en page(s) :	556-572
Langues:	Anglais
Résumé :	We conducted a four-year study on the Olympic Peninsula of Washington to assess the relationship between corvid (Gray Jay [Perisoreus canadensis], Steller's Jay [Cyanocitta stelleri], American Crow [Corvus brachyrhynchos] and Common Raven [Corvus corax]) abundance and the risk of nest predation. We assessed risk of predation through the use of artificial mid-canopy nests and assessed corvid abundance using a variety of techniques including point-count surveys, transect surveys, and the broadcast of corvid territorial arid predator attraction calls. Point counts of corvid abundance had the strongest correlation with predation on artificial nests containing eggs. The relationship between nest predation rate and corvid abundance was strongest when study plots were used as replicated measures of landscape conditions rather than its independent samples. We Suggest using the maximum value for each corvid Species attained from several temporally replicated point-count surveys in each study plot. Corvid point-counts should be conducted on days with light winds (

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