Blar i forfatter Mastergradsoppgaver i biologi "Stien, Jennifer"
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The role of the Hooded Crow (Corvus corone) in the nesting success of the Common Eider (Somateria mollissima) at two colonies in Troms county, Northern Norway
Stien, Jennifer (Master thesis; Mastergradsoppgave, 2008-05)There is evidence of a negative population trend for the two neighbouring eider colonies of Håkøya and Grindøya in Troms county, northern Norway. Casual observations suggest that nest predation may be an important factor, and that the hooded crow in particular could be the main egg predator. On this basis, a two year pilot study was conducted to investigate the role of the hooded crow in the nest ...