环境状况可能影响鸟类迁徙
文章来源:未知 文章作者:enread 发布时间:2014-05-15 07:33 字体: [ ]  进入论坛
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Wind conditions during spring migration1 may be a predictor of apparent annual survival and the timing2 of breeding in yellow warblers, according to results published May 14, 2014, in the open access journal PLOS ONE by Anna Drake from Simon Fraser University, Canada and colleagues. Migratory3 birds play a critical role in the ecosystem4, pollinating plants, dispersing5 seeds, and consuming insects and small mammals. Yellow warblers breed in western Canada and overwinter(过冬) in Mexico, making them difficult to study during all stages of their annual cycle. Scientists used data collected from 380 birds over seven breeding seasons to examine how climatic conditions during the winter migratory and breeding season influenced survival and reproduction. They found that of the climatic models tested, wind speeds on migration best predicted apparent annual adult survival, male arrival date at the breeding site, female egg laying, and annual productivity.
 
Higher westerly wind speeds during migration may be associated with lower apparent annual survival in this study because they reflect storm events that increase the risk of in-flight mortality. High wind speeds that oppose the direction of spring movement may also require birds to use more energy, requiring more stops for food and ultimately delaying arrival at the breeding location. Migration conditions appear to impact both annual survival and the timing of breeding, which in turn strongly predicts annual productivity within this population of migratory birds..
 
Anna Drake added, "We know that winter conditions can have large impacts on migratory birds in eastern North America, but to our surprise we found that conditions on migration had a far greater impact on survival and reproduction of yellow warblers in the west. This is an intriguing6 result and suggests that differences in the geography of the flyways across eastern and western North America alter when climatic conditions influence the population dynamics7 of migratory songbirds."


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1 migration mDpxj     
n.迁移,移居,(鸟类等的)迁徙
参考例句:
  • Swallows begin their migration south in autumn.燕子在秋季开始向南方迁移。
  • He described the vernal migration of birds in detail.他详细地描述了鸟的春季移居。
2 timing rgUzGC     
n.时间安排,时间选择
参考例句:
  • The timing of the meeting is not convenient.会议的时间安排不合适。
  • The timing of our statement is very opportune.我们发表声明选择的时机很恰当。
3 migratory jwQyB     
n.候鸟,迁移
参考例句:
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • This does not negate the idea of migratory aptitude.这并没有否定迁移能力这一概念。
4 ecosystem Wq4xz     
n.生态系统
参考例句:
  • This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
  • We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
5 dispersing dispersing     
adj. 分散的 动词disperse的现在分词形式
参考例句:
  • Whereas gasoline fumes linger close to the ground before dispersing. 而汽油烟气却靠近地面迟迟不散。
  • Earthworms may be instrumental in dispersing fungi or bacteria. 蚯蚓可能是散布真菌及细菌的工具。
6 intriguing vqyzM1     
adj.有趣的;迷人的v.搞阴谋诡计(intrigue的现在分词);激起…的好奇心
参考例句:
  • These discoveries raise intriguing questions. 这些发现带来了非常有趣的问题。
  • It all sounds very intriguing. 这些听起来都很有趣。 来自《简明英汉词典》
7 dynamics NuSzQq     
n.力学,动力学,动力,原动力;动态
参考例句:
  • In order to succeed,you must master complicated knowledge of dynamics.要取得胜利,你必须掌握很复杂的动力学知识。
  • Dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。
TAG标签: wind migration spring
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