Northern Goshawk (Accipiter gentilis) may improve Black Grouse breeding success

摘要: Around the nests of many birds prey pressure nest predators is decreased. This attracts other bird species to breed near those in order benefit from protection conferred. study examines possible protective effect Northern Goshawk (Accipiter gentilis) on two its main species, Black Grouse (Tetrao tetrix) and Capercaillie urogallus). If reduces number corvids robbing grouse nests, there should be a larger proportion females with broods during late summer. We compared observed wildlife-triangle counts, which were performed along 12-km-long equilateral triangle relation distance successful nest. Where Goshawks had nested inside triangle, brood was 20 % higher than situations where 2–3 km away center triangle. On hand, adult rose as increased, but this pattern did not hold chick abundance. No found for Capercaillie. thus provided indirect evidence based quantitative data that may create one prey.