Season-long consequences of shifts in timing of breeding for productivity in Willow Warblers, Phylloscopus trochilus
Season-long consequences of shifts in timing of breeding for productivity in Willow Warblers, Phylloscopus trochilus
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柳莺、Phylloscopus trochilus 繁殖时间变化对生产力的影响
DOI：
10.1080/00063657.2015.1006575
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发表时间：
2015
期刊：
影响因子：
0.7
通讯作者：
Morrison C
中科院分区：
文献类型：
--
作者：
Morrison C
CapsuleBreeding杨柳Warblers，Phylloscopus trochilus，in the UK have advanced in timing of breeding but with little impact on overall productivity.AimsTo quantify the impact of shifts in timing of breeding on changes in杨柳Warbler productivity across the UK.MethodsUsing records of 107000 nets from the British Trust for Ornithology Nest Record Scheme，我们量化了繁殖时间的变化和生产力和繁殖时间的季节性变化，并探讨了它们对整体生产力变化的相对贡献。由于人口轨迹不同，在英国（东南下降，西北稳定），分析进行regionalised.ResultsIn这两个地区，筑巢日期提前和赛季初的生产力最高。然而，虽然早季巢的比例增加了，但西北部生产力的季节性下降有所减少，总体（整个季节）生产力稳定。然而，在东南部，生产力的季节性下降加强，尽管提前育种的时间，整体生产力下降了declined.ConclusionsAdvances在育种的时间并没有导致增加杨柳莺生产力在英国，因为人口水平的影响，进步取决于生产力和筑巢日期分布在人口的季节性模式。
CapsuleBreeding Willow Warblers,Phylloscopus trochilus,in the UK have advanced in timing of breeding but with little impact on overall productivity.AimsTo quantify the impact of shifts in timing of breeding on changes in Willow Warbler productivity across the UK.MethodsUsing records of ∼7000 nests from the British Trust for Ornithology Nest Record Scheme, we quantify shifts in timing of breeding and seasonal variation in productivity and timing of breeding, and explore their relative contribution to changes in overall productivity. As population trajectories vary across Britain (south-east declining, north-west stable), analyses were conducted regionally.ResultsIn both regions, nesting dates have advanced and early-season productivity is highest. However, while the proportion of early-season nests has increased, the seasonal decline in productivity in the north-west has lessened, and overall (season-long) productivity is stable. In the south-east, however, the seasonal decline in productivity has strengthened and, despite the advance in timing of breeding, overall productivity has declined.ConclusionsAdvances in timing of breeding have not led to increased Willow Warbler productivity in the UK, because the population-level impact of advances depends on seasonal patterns in both productivity and the distribution of nesting dates within a population.
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