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Patchy distribution and systematics of Oreomanes fraseri (Aves, ?Coerebidae) of Andean Polylepis woodlands. American Museum novitates ; no. 2777

Show simple item record Vuilleumier, François, 1938-2017. en_US 2005-10-06T18:12:03Z 2005-10-06T18:12:03Z 1984 en_US
dc.description 17 p. : 2 maps ; 26 cm. en_US
dc.description Includes bibliographical references (p. 15-17). en_US
dc.description.abstract "The giant conebill, Oreomanes fraseri Sclater, 1860, is an endemic, monotypic genus of coerebid or thraupid-like bird distributed in the high Andes of South America from southern Colombia to southwestern Bolivia. This well-marked taxon appears to be restricted ecologically to 'islands' of woodland vegetation above timberline that are dominated by trees of the endemic Andean genus Polylepis (Rosaceae). The geographical distribution of Oreomanes fraseri is quite patchy. Oreomanes fraseri shows geographical variation in bill size and plumage color. Geographical variation, however, is very minor, and so it does not seem useful to describe it in terms of subspecies. The pattern of this variation is partly clinal amd partly checkerboard, as one would expect from the nature of the discontinuous distribution of the species. Range disjunctions and geographical isolation of populations do not appear conducive to incipient speciation. The patterns of geographical distribution and variation suggest either: (a) that the origin of the disjunctions is recent (i.e., there has not been enough time for the isolates to become morphologically and presumably also genetically differentiated); (b) the geographical isolation has been insufficient to promote differentiation (i.e., gene flow exists between isolated populations and counters the disrupting effects of geographical isolation); or (c) geographical isolation is effective and is relatively old in origin but the rate of morphological differentiation in the isolates is slow. Data are lacking at present to permit one to check which of these hypotheses is the most likely to explain the observed patterns"--P. [1]. en_US
dc.format.extent 2085381 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, N.Y. : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates ; no. 2777 en_US
dc.subject.lcc QL1 .A436 no.2777, 1984 en_US
dc.subject.lcsh Oreomanes fraseri. en_US
dc.subject.lcsh Birds -- Andes Region. en_US
dc.subject.lcsh Birds -- South America. en_US
dc.subject.lcsh Polylepis. en_US
dc.title Patchy distribution and systematics of Oreomanes fraseri (Aves, ?Coerebidae) of Andean Polylepis woodlands. American Museum novitates ; no. 2777 en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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