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Does organic farming benefit farmland birds in winter?

机译:冬季有机耕种对农田鸟类有好处吗?

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摘要

The generally higher biodiversity on organic farms may be influenced by management features such as no synthetic pesticide and fertilizer inputs and/or by differences in uncropped habitat at the site and landscape scale. We analysed bird and habitat data collected on 48 paired organic and conventional farms over two winters to determine the extent to which broad-scale habitat differences between systems could explain overall differences in farmland bird abundance. Density was significantly higher on organic farms for six out of 16 species, and none on conventional. Total abundance of all species combined was higher on organic farms in both years. Analyses using an information-theoretic approach suggested that both habitat extent and farm type were important predictors only for starling and greenfinch. Organic farming as currently practised may not provide significant benefits to those bird species that are limited by winter food resources, in particular, several declining granivores.
机译:有机农场普遍较高的生物多样性可能受到管理特征的影响,例如没有合成农药和化肥投入,和/或受场地和景观尺度上未耕种生境的差异影响。我们分析了两个冬季从48个配对的有机农场和常规农场收集的鸟类和栖息地数据,以确定系统之间广泛的栖息地差异在多大程度上可以解释农田鸟类丰度的总体差异。在16种中的6种中,有机农场的密度显着较高,而常规农场则没有。两年中,有机农场的所有物种的总丰度都较高。使用信息论方法进行的分析表明,生境范围和农场类型都是仅对八哥和绿翅雀而言是重要的预测指标。目前实践中的有机耕种可能不会为那些受冬季食物资源(尤其是几种食肉动物数量下降)限制的鸟类提供重大利益。

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