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Message: <blockquote data-quote="Daniel Philippe" data-source="post: 3052259" data-attributes="member: 64614">Borneo and JavaIdentification of current and historical hybrid zones of the oriental magpie-robin (Copsychus saularis) and the white-rumped shama (Copsychus malabaricus) on Borneo and Java through morphological and genetic analyses.D. F. Gawin, M. A. Rahman & F. H. SheldonBiogeographers have deduced that during glacial times a collection of events--including low sea levels, reduced temperatures, and moderated oceanic effects--altered the distribution of vegetation on the Sunda continental shelf in Southeast Asia. As a result of these events, populations of rainforest animals were periodically isolated in refugia in eastern and western Sundaland. One outcome of these refugia was the production of morphologically and genetically distinct populations in eastern and western Sundaland. We have studied the interaction of these east-west populations in two species on Borneo and Java: the oriental magpie-robin (Copsychus saularis) and the white-rumped shama (C. malabaricus). In the magpie-robin, comparisons suggest that the white-bellied subspecies musicus from western Sundaland (Sumatra and Malay Peninsula) invaded and hybridized with the eastern black-bellied subspecies adamsi and pluto on Borneo and amoenus on Java. The locations where the white- and black-bellied forms come together and hybridize in northern Borneo is reasonably well known, but where they hybridize in central Borneo is still unclear. Little is known about the extent of crossing between populations in any part of Java. An analogous situation occurs in the shama involving the western blackcapped (suavis) and eastern white-capped (stricklandii) subspecies. Several studies have assessed the general situation in both species using traditional morphological and modern molecular techniques, but have not worked out the details of interaction between the forms. To solve this problem, we have undertaken comprehensive molecular comparisons and combined these with morphological analysis of skin specimen data. Our goals are to resolve the position of contact zones and extent of hybridization between the subspecies, to determine whether the contact zones are moving, and to assess whether the subspecies actually represent distinct species by virtue of their age and reproductive isolation.26th International Ornithological Congress 2014, Tokyo</blockquote>

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