摘要 : Population declines of farmland birds over recent decades in Europe, Canada and the USA have been attributed to more intensive agricultural management. We counted birds during the 1990 breeding season on 72 field sites in southern... 展开
作者 | Freemark KE Kirk DA |
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作者单位 | |
期刊名称 | 《Biological Conservation》 |
总页数 | 14 |
语种/中图分类号 | 英语 / S1 |
关键词 | Farmland birds Organic farms Habitat and practices Canonical Canonical correspondence-analysis Farmland birds Agricultural landscapes Breeding success Terrestrial wildlife Population trends Southern ontario Lowland farmland North-america Field use |
馆藏号 | N2008EPST0012284 |