Field Vole Microtus agrestis abundance and Hen Harrier Circus cyaneus diet and breeding in Scotland

摘要: In many parts of the global range, voles form an important part diet Hen Harriers Circus cyaneus, and breeding numbers are correlated with abundance these small mammals. Scotland, however, little information is available on harrier in spring our understanding causes variation density complicated by human interference. this paper we explore relationship between Field Vole Microtus agrestis diet, productivity southern Scotland. Over three years, occurred average 67% pellets, 79% years high intermediate vole abundance. From 1992, number harriers increased following protection from illegal persecution. After accounting for trend, strongly Harrier clutch size was also Although fledging success tended to be greater increase than decline, not significantly relative voles, or Meadow Pipits Red Grouse chicks.