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首页> 外文期刊>The Wilson Bulletin >Re-evaluating the Bay-breasted Warbler Breeding Range: Nine Years of Presence in Lower Michigan
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Re-evaluating the Bay-breasted Warbler Breeding Range: Nine Years of Presence in Lower Michigan

机译:重新评估海湾胸莺的繁殖范围:下密歇根州存在九年

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摘要

The breeding range of the Bay-breasted Warbler (Dendroica castanea) is thought to include only the northernmost portions of six northeastern and northcentral states in the United States. During a 10-year banding study of Kirtland's Warblers (Dendroica kirtlandii) in northern Lower Michigan, we caught 44 Bay-breasted Warblers outside of their reported migration dates during 9 of the 10 years. Two birds captured in 1997 were in breeding condition; one possessed a cloacal protuberance and the other a full brood patch. We also captured two hatching year birds with fleshy rictal flanges in 1997. We suggest that these records indicate a long term presence of Bay-breasted Warblers on breeding grounds considerably farther south than previously recorded.
机译:据认为,海湾胸莺(Dendroica castanea)的繁殖范围仅包括美国东北部和中北部六个州的最北端。在下密歇根州北部的柯特兰莺(Dendroica kirtlandii)进行的为期10年的分带研究中,我们在10年中的9年中,在报告的迁徙日期之外捕获了44枚海湾胸莺。 1997年捕获的两只鸟处于繁殖状态。一个拥有泄殖腔突起,另一个具有完整的育雏斑。在1997年,我们还捕获了两只带有肉质米突缘的孵化年鸟类。我们建议,这些记录表明与过去记录相比更南的繁殖地上长期存在海湾胸莺。

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