COMPARISON OF SPRING AND FALL MIGRATION OF AMERICAN REDSTARTS ON APPLEDORE ISLAND, MAINE
COMPARISON OF SPRING AND FALL MIGRATION OF AMERICAN REDSTARTS ON APPLEDORE ISLAND, MAINE
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缅因州阿普尔多尔岛美国红尾鸲春季和秋季迁徙的比较
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发表时间：
2001
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影响因子：
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通讯作者：
J. Glasgow
中科院分区：
文献类型：
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作者：
S. R. Morris;J. Glasgow
摘要 在缅因州阿普尔多尔岛上，美国红尾鸲（Setophaga ruticilla）在1990年至1999年的春季和秋季迁徙期间经常遇到。春季雄性到达时间早于雌性，但秋季期间雄性和雌性到达日期没有显着差异。此外，在春季，成鸟比幼鸟更早到达，但在秋季则不然。初次捕获后至少一天重新捕获带状鸟类的情况在秋季比春季更频繁，尽管两个季节之间的平均停留时间没有显着差异。尽管在两个季节中途停留期间，重新捕获的个体质量都有所增加，但仅在秋季期间质量增加才显着。然而，通过条件随捕获时间的回归估计的质量增加率表明春季期间质量增加更大。在任一季节内，男性和女性之间或年龄组之间的重新捕获率、停留时间和质量变化都没有显着差异。这些结果表明，尽管在春季和秋季迁徙期间在阿普尔多尔岛遇到了许多美国红尾鸲，但鸟类在这两个季节对这个地点的使用方式有所不同。春季迁徙更加集中，几乎没有观察到的中途停留，而秋季迁徙则随着重新捕获率的增加而延长。美洲红尾鸲在春季和秋季迁徙期间对该地点的反应可能有所不同，因为该地点靠近繁殖地且距冬季场地较远，而且大西洋的位置代表了秋季迁徙期间的生态屏障。
Abstract On Appledore Island, Maine, American Redstarts (Setophaga ruticilla) were encountered frequently during both spring and fall migration from 1990 to 1999. Males arrived earlier than females during spring, but arrival dates of males and females did not differ significantly during fall. Also, adults arrived earlier than young birds during spring, but not during fall. Recapture of banded birds at least one day after initial capture occurred more frequently during fall than spring, although mean stopover length did not differ significantly between the two seasons. Although recaptured individuals increased in mass during stopover during both seasons, mass increases were significant only during fall. However, rates of mass increase estimated by regression of condition over time of capture indicated greater mass increases during spring. Neither recapture rates, stopover lengths, nor mass changes differed significantly between males and females or between age groups within either season. These results indicate that although many American Redstarts were encountered on Appledore Island during both spring and fall migration, birds were using the site differently during the two seasons. Spring migration was more concentrated with few observed stopovers, while fall migration was protracted with increased rates of recapture. American Redstarts may have been responding differently to this site during spring and fall migration because of the proximity to breeding grounds and distance from winter grounds as well as the location of the Atlantic Ocean, which represents an ecological barrier during fall migration.