Comparison of nest-site selection patterns of different sympatric raptor species as a tool for their conservation

Abstract

In this study the nest-site selection patterns of four tree-nesting sympatric raptor species in Dadia National Park (Greece) were compared in order to provide a sound conservation tool for their long-term management in the area. The species studied were the Black vulture (Aegypius monachus), the Lesser-spotted eagle (Aquila pomarina), the Booted eagle (Hieraaetus pennatus) and the Goshawk (Accipiter gentilis). Twenty-six variables illustrating the landscape context and vegetation structure of nesting sites were analysed. Multivariate-ANOVA and Discriminant Function Analysis were used to test for significant differentiations in nest-site characteristics among the species. The species studied were initially differentiated by geomorphology and distance to foraging areas. Once these were determined their nesting areas were established according to forest structure. Our results indicate that forest management should integrate the preservation of mature forest stands with sparse canopy and forest heterogeneity in order to conserve suitable nesting habitats for the raptors. Specific conservation measures such as restriction of road construction should be implemented in order to protect the active nests and provisions should be made for adequate nesting sites for the Black vulture, which is sensitive to human disturbance.

Keywords

• Sympatric raptors
• Discriminant analysis
• Nesting habitat separation
• Conservation guidelines