ABSTRACT Two species of orioles, namely the Olive-backed Oriole (Oriolus sagittatus) and the Yellow Oriole (O. flavocinctus), occur across northern Australia. In New Guinea, both are confined to the Trans-Fly region immediately north of Cape York Peninsula. They occur there in Melaleuca-dominated ‘swamp savanna’, which is neither eucalypt savanna nor rainforest typical of their Australian habitats. A readily identifiable specimen of the Olive-backed Oriole collected in 2014 from the Trans-Fly has a mitochondrial DNA ND2 haplotype identical with Yellow Orioles. Its dorsal plumage has traits typical of Yellow Orioles. We infer it to have been descended from a hybridisation event involving a female Yellow Oriole followed by successive generations of backcrossing with Olive-backed Orioles. Three aberrantly plumaged orioles from New Guinea’s Trans-Fly region date from 1937, 1969 and 2014. The 1969 specimen appears to be an aberrant Yellow Oriole. Molecular data are similarly not available for the 1937 specimen but its plumage is suggestive of hybrid origin. The 2014 bird’s ND2 haplotype is identical with some Olive-backed Orioles and is inferred to be descended from hybridisation involving a female Olive-backed Oriole. Integration of phenotypic and genetic data directs study to understand drivers underpinning an unusually high frequency of aberrantly plumaged orioles.

中文翻译：

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来自新几内亚 Trans-Fly 稀树草原的异常羽毛黄鹂及其生态和进化意义

摘要 澳大利亚北部有两种黄鹂，即橄榄背鹬 (Oriolus sagittatus) 和黄鹂 (O. flavocinctus)。在新几内亚，两者都仅限于约克角半岛以北的 Trans-Fly 地区。它们出现在以千层为主的“沼泽稀树草原”中，这既不是桉树稀树草原，也不是澳大利亚栖息地典型的热带雨林。2014 年从 Trans-Fly 收集的橄榄背金莺的一个易于识别的标本具有与黄色金莺相同的线粒体 DNA ND2 单倍型。它的背羽具有黄鹂的典型特征。我们推断它是杂交事件的后代，该事件涉及雌性黄鹂，随后与橄榄背鹂进行了连续几代回交。1937、1969 和 2014 年来自新几内亚 Trans-Fly 地区的三只羽毛异常的金莺。1969 年的标本似乎是一只异常的黄鹂。1937 年的标本同样没有分子数据，但它的羽毛表明是杂种起源。2014 年鸟类的 ND2 单倍型与一些橄榄背金莺相同，并被推断为涉及雌性橄榄背金莺的杂交后代。表型和遗传数据的整合指导研究以了解支持异常高频率的异常羽毛黄鹂的驱动因素。2014 年鸟类的 ND2 单倍型与一些橄榄背金莺相同，并被推断为涉及雌性橄榄背金莺的杂交后代。表型和遗传数据的整合指导研究以了解支持异常高频率的异常羽毛黄鹂的驱动因素。2014 年鸟类的 ND2 单倍型与一些橄榄背金莺相同，并被推断为涉及雌性橄榄背金莺的杂交后代。表型和遗传数据的整合指导研究以了解支持异常高频率的异常羽毛黄鹂的驱动因素。