Population-scale drivers of individual arrival times in migratory birds
Population-scale drivers of individual arrival times in migratory birds
复制标题
DOI：
10.1111/j.1365-2656.2006.01131.x
复制
发表时间：
2006-09-01
影响因子：
4.8
通讯作者：
Sutherland, William J.
中科院分区：
文献类型：
--
作者：
Gunnarsson, Tomas G.;Gill, Jennifer A.;Sutherland, William J.
1.在迁徙物种中，早期到达繁殖地通常可以提高繁殖成功率。因此，春季迁徙的时间是一个关键过程，可能受到个体特有因素的影响，例如冬季和繁殖地点的质量以及它们之间的距离，以及迁徙前和迁徙期间天气条件的年度变化。冰岛黑尾白尾天蛾Limosa islandica的数量目前正在增加，并且在整个冰岛，正在向质量较差的繁殖区扩展。使用一个独特的数据集，在冰岛的到达时间在不同年份的个人已知的繁殖和越冬地点，我们表明，个人繁殖质量较低，最近占领和寒冷的地区到达晚于那些从传统上占领的地区。种群也在向新的越冬地区扩张，来自传统越冬地点的雄性也比那些占据新地点的雄性更早到达。个体迁移时间的年度变化受大尺度天气系统（北大西洋涛动）的影响，但个体间变化是比NAO更强的到达时间预测因子。冬季和繁殖地点之间的距离不影响到达时间。因此，迁徙时间的年度变化受气候因素的影响，但个体到达的模式主要与繁殖和冬季栖息地质量有关。这些栖息地对到达模式的影响可能会通过个体条件和局部尺度密度依赖过程的变化来运作。因此，迁徙的时间似乎是这个迁徙系统中越冬地和繁殖地之间错综复杂关系的一个关键组成部分。
1. In migratory species, early arrival on the breeding grounds can often enhance breeding success. Timing of spring migration is therefore a key process that is likely to be influenced both by factors specific to individuals, such as the quality of winter and breeding locations and the distance between them, and by annual variation in weather conditions before and during migration.2. The Icelandic black-tailed godwit Limosa limosa islandica population is currently increasing and, throughout Iceland, is expanding into poorer quality breeding areas. Using a unique data set of arrival times in Iceland in different years for individuals of known breeding and wintering locations, we show that individuals breeding in lower quality, recently occupied and colder areas arrive later than those from traditionally occupied areas. The population is also expanding into new wintering areas, and males from traditionally occupied winter sites also arrive earlier than those occupying novel sites.3. Annual variation in timing of migration of individuals is influenced by large-scaleweather systems (the North Atlantic Oscillation), but between-individual variation is a stronger predictor of arrival time than the NAO. Distance between winter and breeding sites does not influence arrival times.4. Annual variation in timing of migration is therefore influenced by climatic factors, but the pattern of individual arrival is primarily related to breeding and winter habitat quality. These habitat effects on arrival patterns are likely to operate through variation in individual condition and local-scale density-dependent processes. Timing of migration thus appears to be a key component of the intricate relationship between wintering and breeding grounds in this migratory system.