The size of black grouse lek populations in relation to habitat characteristics in Southern Norway
1995
Hjeljord, O. (Agricultural Univ. of Norway. Dept. of Biology and Nature Conservation) | Fry, G. (Agricultural Univ. of Norway. Inst. for Nature Research)
Colour infra-red aerial photographs at 1:15,00 scale were used to analyse the habitat characteristics of forested landscapes within a 1.5 km radius of 38 Black Grouse leks in Southern Norway. A stratified random point-sampling techniques was used to quantify the cover of different types of forest, clearcuts, lakes, mires, roads, human dwelling and cultivated fields. Habitat heterogeneity was assessed by sampling along linear transects. The area of open mire was the only habitat component to show a significant positive relationship with the size of lek populations. There was no correlation with area of preferred winter habitat such as old birch forest and there was no clear relationship between lek populations and habitat heterogeneity. Quality of brood habitat may be the most important determinant of size of lek populations of Black Grouse in the area studied
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