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首页> 外文期刊>Bird Study >Effects of the winter beechmast crop on bird occurrence in British gardens: woodland birds were significantly less likely to occur in gardens in years of high beechmast crop.
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Effects of the winter beechmast crop on bird occurrence in British gardens: woodland birds were significantly less likely to occur in gardens in years of high beechmast crop.

机译：冬季山毛榉作物对英国花园中鸟类的影响：在高山毛榉作物年份中，林地鸟类在花园中出现的可能性大大降低。

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Aim: To test the hypothesis that woodland species that feed on beechmast will have significantly lower occurrence rates at garden feeders in mast years. Methods: Weekly winter occurrence rates at garden feeders between 1970/71 and 1999/2000 for 40 species were analysed in relation to annual beechmast abundance, classified into low, medium and high years. A repeated-measures logistic regression model was used to assess whether beechmast abundance explained further significant variation additional to underlying seasonal and annual trends. Results: Seven species that commonly feed on beechmast showed significantly lower occurrence in gardens in years of highest beechmast abundance: Great Spotted Woodpecker Dendrocopos major, Woodpigeon Columba palumbus, Great Tit Parus major, Coal Tit Periparus ater, Nuthatch Sitta europaea, Jay Garrulus glandarius and Chaffinch Fringilla coelebs. Blackbird Turdus merula and Siskin Carduelis spinus, which showed similar significant patterns, are likely to take beechmast as elements of their diet. Pied Wagtail Motacilla alba was the only insectivorous species to show significant effects, but occurrence was lowest in years of intermediate beechmast abundance. For the latter species, this may have been due to confounding effects of temperature, but there were no such confounding effects of either temperature, or the number of bird feeders provided in gardens, for the other nine species. Conclusion: Use of artificial food sources by birds in gardens is influenced by resources in the surrounding countryside, suggesting that food provided in gardens may play a significant part in the population dynamics of these species, that population monitoring without consideration of the garden habitat may be deficient, and that volunteer-based garden bird recording may provide data that can be used as an indicator of changes in the wider countryside.
机译：目的：检验假说，以山毛榉为食的林地物种在肥大年的花园饲养者中的发生率将大大降低。方法：分析了1970/71年至1999/2000年间40个种类在花园支线的每周冬季发生率，与每年的山毛a丰度相关，分为低，中和高年。使用重复测量的逻辑回归模型评估beechmast的丰度是否解释了除了潜在的季节性和年度趋势以外的其他显着变化。结果：在山毛榉丰度最高的年份中，通常以山毛榉为食的七个物种在花园中的发生率显着降低：大斑啄木鸟Dendrocopos专业，Woodpigeon哥伦巴palumbus，Great Tit Parus专业，Coal Tit Periparus ater，Nuthatch Sitta europaea，Jay Garrulus glandarius和燕雀Fringilla coelebs。黑鸟Turdus merula和Siskin Carduelis spinus表现出相似的明显模式，很可能以山毛榉为饮食成分。斑尾Wa Motacilla alba是唯一显示出显著作用的食虫物种，但在中级山毛榉丰度年中发生率最低。对于后一种物种，这可能是由于温度的混杂效应引起的，但对于其他九种物种，温度，花园中提供的鸟类喂食器的数量都没有这种混杂效应。结论：花园中鸟类使用人工食物来源受到周围农村地区资源的影响，这表明花园中提供的食物可能在这些物种的种群动态中起重要作用，因此不考虑花园栖息地而进行的种群监测可能是重要的。缺乏，基于自愿者的花园鸟类记录可能会提供可作为更广泛农村变化指标的数据。

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