Coarse and fine-scale habitat associations of breeding Skylarks Alauda arvensis in the UK.

摘要: The occurrence of breeding Skylarks, in terms both density and presence/absence, was assessed from Breeding Bird Survey data relation to habitat a random sample about 1500 1-km squares throughout the UK two consecutive years, with particular emphasis on farmland habitat. Upland grassland other seminatural habitats held highest mean densities Skylarks. Within farmland, arable land pasture lowest densities, but there seasonal decline density. Regression analyses showed that Skylark most consistently related area (positive effects) woodland (negative effects). increased increasing diversity upland only. boundary characteristics presence grazers had consistent negative effects. field types positively density, which gives some support hypothesis th...