How representative of agricultural practice in Britain are Common Birds Census farmland plots
作者： R. J. Fuller , J. H. Marchant , R. A. Morgan
DOI: 10.1080/00063658509476856
关键词:
摘要: The Common Birds Census is designed to measure year-to-year changes in bird population levels. But how representative are the sample plots of country as a whole? What being measured?
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