Nesting biology of Debrecen’s Hooded Crow (Corvus cornix L. 1758) population

  • Lajos Juhász University of Debrecen Faculty of Agricultural and Food Sciences and Environmental, Department of Nature Conservation Zoology and Game Management
  • László Kövér University of Debrecen Faculty of Agricultural and Food Sciences and Environmental, Department of Nature Conservation Zoology and Game Management
  • Péter Gyüre University of Debrecen Faculty of Agricultural and Food Sciences and Environmental, Department of Nature Conservation Zoology and Game Management
Keywords: Hooded Crow, Corvus cornix, nesting biology, urban environment, urban ecology

Abstract

During the past decade Hooded Crow nesting population has performed a significant growth in Debrecen. Our knowledge about the habits of species living in urban environment, e.g. about their nesting biology is still incomplete. During 2006-2011 we found 156 active nests in Debrecen, build on 18 tree species. Hooded Crows living in the city builded their nests in higher regions (16.4 m, n=156), than those living in places outside the city. We could explain it with higher safety. When we compared the nesting height between different habitats we found no significant difference (KruskalWallis teszt, H=3.559, df=3, p=0.313). In the case of Quercus robur a considerable number (71%, n=45) of crows built their nests in the roots of Loranthus europaeus that we could also explain with higher safety. The crows built new nest every year. According to our observation the pairs keep/defend their nesting area year by year but because the nest density has grown continuously (R2=0.9668) these could break up. The nest sizes: internal diameter: 23 cm (n=29), depth: 10 cm (n=23). The opportunistic character of Hooded Crow was also proved by the anthropogenic ingredients used for nest building.

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Published
2012-12-31