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首页> 外文期刊>The wilson journal of ornithology >Eye-ring Coloration is Not a Reliable Indicator for Aging Mangrove Cuckoos (Coccyzus minor)
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Eye-ring Coloration is Not a Reliable Indicator for Aging Mangrove Cuckoos (Coccyzus minor)

机译：眼圈的颜色不是老化的红树林杜鹃（小尾吻）的可靠指标

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摘要

Soft-part coloration can be a useful method for determining the age of a bird. For example, hatch-year and early second-year Mangrove Cuckoos (Coccyzus minor) are supposedly distinguishable from older birds based on the presence of a dusky gray eye-ring; individuals gain a vivid yellow eye-ring in their second year of life that they retain for the rest of adulthood. However, observational data collected on banded Mangrove Cuckoos throughout the year indicate that eye-ring coloration varies seasonally rather than with age. We captured and banded two individuals in early spring, each with a yellow eye-ring. Re-sightings of these individuals later in the spring and early summer revealed that the eye-ring had changed to a dusky gray color. Subsequent re-sightings of these individuals again in the fall and winter revealed that both once again had a yellow eye ring. In reviewing photographs and notes taken during observation of marked and unmarked individuals, we determined that this pattern—a yellow eye-ring during late summer, fall, and winter (nonbreeding) and a dusky-gray eye-ring during spring and early summer (breeding)—was consistent across individuals in the population in Florida that we studied.
机译：柔和的部分着色可能是确定鸟的年龄的有用方法。例如，据推测，孵化年和第二年初的红树林布谷鸟杜鹃（Coccyzus minor）可以根据年龄较浅的灰眼圈区别于大鸟。个人在第二年的生活中会获得鲜活的黄色眼圈，并保留到成年后。但是，全年收集的带状红树林杜鹃的观测数据表明，眼圈的颜色随季节而不是年龄而变化。我们在早春捕获并绑扎了两个人，每个人都有一个黄色的耳环。在春季和夏季初对这些人的视线显示，眼圈已变成暗灰色。随后在秋季和冬季对这些人的视线再次表明，他们俩都再次染上了黄色的眼圈。在查看观察有标记和无标记个体时拍摄的照片和笔记时，我们确定了这种模式-夏末，秋季和冬季（非繁殖期）为黄色的眼圈，而春夏初夏为淡灰色的眼圈（繁殖）-在我们研究的佛罗里达人口中，个体之间是一致的。

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