Population trends of breeding birds in British woodlands over a 32-year period: relationships with food, habitat use and migratory behaviour
Population trends of breeding birds in British woodlands over a 32-year period: relationships with food, habitat use and migratory behaviour
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DOI：
10.1111/j.1474-919x.2009.00937.x
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发表时间：
2009-07-01
期刊：
影响因子：
2.1
通讯作者：
Noble, David G.
中科院分区：
文献类型：
--
作者：
Hewson, Chris M.;Noble, David G.
本文概述了1967年至1999年英国鸟类基金会（BTO）普通鸟类普查（CBC）监测的英国林地栖息地49种鸟类的种群趋势（带置信区间）。此外，通过将物种的生态特征与它们在不同时期所经历的种群变化程度联系起来，研究了这些种群趋势的可能原因。在整个时期，17种物种的丰度显著减少，12种物种的丰度显著增加。虽然种群轨迹多样，但长途迁徙的种群比其他物种表现出更多的负面趋势，其种群变化的时间与其越冬纬度有关，这表明这些物种可能受到非繁殖季节环境变化的影响。生境专门化也与种群变化有关，被分类为灌丛和下层植物专门化的物种平均下降，但这只是在整个研究期间才明显。夏季以种子为食的物种减少，以植被为食和利用农业景观基质的物种增加。因此，除了当地的栖息地变化之外，诸如景观尺度过程或在英国以外运行的过程等大尺度因素似乎也很重要，尤其是对长途移民而言。
This paper outlines population trends (with confidence intervals) for 49 species in woodland habitats in Britain as monitored by the British Trust for Ornithology's (BTO) Common Bird Census (CBC) between 1967 and 1999. Additionally, the possible causes of these population trends are investigated by relating the ecological characteristics of species to the degree of population change they have undergone over different time periods. Over the whole period, 17 species showed significant decreases in abundance and 12 species showed significant increases. Whilst population trajectories were diverse, long-distance migrants showed more negative trends than other species and the timing of the changes in their populations was related to their wintering latitude, suggesting that these species may be suffering from environmental changes in the non-breeding season. There was also support for habitat specializations being related to population changes, with species classified as scrub and understorey specialists declining on average, but this was only evident across the entire study period. Additionally, species eating seeds in summer declined and those eating vegetation and making use of the agricultural landscape matrix increased. Therefore wide-scale factors such as landscape-scale processes or processes operating outside of Britain appear to be important in addition to local habitat change, especially for long-distance migrants.