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首页> 外文期刊>Ostrich >Inferred hybridisation, sympatry and movements of Chorister Robin-Chat Cossypha dichroa and Red-capped Robin-Chat C. natalensis
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Inferred hybridisation, sympatry and movements of Chorister Robin-Chat Cossypha dichroa and Red-capped Robin-Chat C. natalensis

机译：知母罗宾-Chat Cossypha dichroa和红顶罗宾-Chat natalensis的杂交，交感和运动

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摘要

Inferred hybrid Chorister Robin-Chat Cossypha dichroa and Red-capped Robin-Chat C. natalensis have previously only been recorded from the Eastern Cape province, South Africa. We extend the occurrence of inferred hybrids with ringed and photographed examples from KwaZulu-Natal and Limpopo provinces. Sympatry at a fine scale was investigated at Vernon Crookes Nature Reserve, KwaZulu-Natal, using observational data over 30 years (1978-2008) and intensive mist-netting during two field-trips in June and October 2010. Both robin-chat species were found throughout the year and occurred in the same forest patches. Inferred hybrids are known from five different forest patches in Vernon Crookes, three with photographic evidence. During winter an increase in Chorister Robin-Chat numbers was detectable both from mist-netting and checklist data. An increase of Red-capped Robin-Chats was observed from mist-netting and more equivocally from checklist data in spring. Red-capped and Chorister Robin-Chats are sympatric along the eastern escarpment of South Africa, with co-occurrence in 96 quarter degree squares from Southern African Bird Atlas Project 1 data. During the breeding season, co-occurrence was recorded in 62 quarter degree squares and in nine grid-cells evidence of breeding by both species is available. Hybridisation may be more common along the extensive area of sympatry than currently realised.
机译：以前仅从南非东开普省记录到推断的杂交Chorister Robin-Chat Cossypha dichroa和红顶的Robin-Chat natalensis。我们用夸祖鲁-纳塔尔省和林波波省的有环和照相示例扩展了推断的杂种的发生。使用30年（1978-2008）的观测数据以及2010年6月和2010年10月的两次实地考察期间的密集薄雾网，对夸祖鲁-纳塔尔省弗农克鲁克斯自然保护区进行了细规模的共生研究。全年被发现并发生在同一片森林中。从弗农克鲁斯的五个不同森林斑块中可以推断出杂交种，其中三个有摄影证据。在冬季，从薄雾网和清单数据中都可以发现Chorister Robin-Chat的数量有所增加。从薄雾网观察到红顶知更鸟的数量增加，而春季清单上的数据则更加模棱两可。红帽和Chorister Robin-Chats是同属南非南部悬崖的同胞，在“南非飞鸟图集”项目1数据中共出现96个四分之一度方格。在繁殖季节，共出现了62个四分之一度方格，并且在9个网格中记录了两种物种共同繁殖的证据。杂交可能在广泛的共生区域上比目前实现的更为普遍。

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