The decline of black grouse in scotland and northern england
作者： D. Baines , P. J. Hudson
DOI: 10.1080/00063659509477158
关键词: Demography 、 Black grouse 、 Shot (pellet) 、 Tetrao 、 Population 、 Geography
摘要: Analysis of shooting bag records suggest a 90–¸93% decrease in numbers Black Grouse shot Scotland and northern England since 1900. The magnitude the decline differed between regions; most severe declines were found western Scotland, where highest birds once shot, but fewest are today. By contrast, eastern (Perthshire Angus) have declined relatively little this region is currently stronghold for Britain. Overall, changed over last 40 years, as only 25% estates now shoot Grouse, bags may no longer provide an accurate index population trends. Responses from questionnaire survey spring counts males attending leks support trends inferred records, with fewer having those that had reporting declining populations more frequently male densiti...
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