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Hybridization in meadowlarks. Bulletin of the AMNH ; v. 134, article 1

Show simple item record Lanyon, Wesley E. en_US 2005-10-06T14:56:24Z 2005-10-06T14:56:24Z 1966 en_US
dc.description 25 p., 8 p. of plates : ill. (some col.) ; 27 cm. en_US
dc.description Includes bibliographical references (p. 24-25). en_US
dc.description.abstract "Previous studies of the comparative biology of the eastern meadowlark (Sturnella magna) and the western meadowlark (S. neglecta) have revealed that these sibling species are virtually, if not completely, isolated throughout a rather narrow zone of sympatry from central Mexico to the Great Lakes region of the United States. A case of hybridization of the two species in New York is fully substantiated by the capture of both adults and their hybrid offspring, and by the subsequent analysis of the morphology and vocalizations of the captive birds. Another hybrid, from Quebec, was also raised in captivity and is included in this analysis. A total of six hybrids are reported on here, all of which represent the first generation of hybrids produced by crossings in the wild of neglecta males with nominate magna females. No data are currently available on the reciprocal cross or on populations of magna other than the nominate race. Attempts to breed and to hybridize these captive individuals have failed. Morphologically, the first generation of hybrids of this particular cross are phenotypically indistinguishable from the magna parent with respect to those characters that depend on the intensity of melanic and carotenoid pigmentation, but are intermediate between the parental types with respect to the sexually dimorphic characters, including cheek color and mensural characteristics. Mensural characters are useless as indices of hybridization except for the elimination of 'extreme' specimens. All hybrid males from this cross should be identifiable by the concordance of a prominent yellow area on the cheek with an overall dark plumage coloration. The same characters must be used for females, but with considerably less confidence. The size of the repertoire of primary song patterns shows some promise as a clue for the field identification of hybrid males, but the actual patterns of primary song are meaningless for this purpose. Conflicting evidence on the call notes of hybrids necessitates further experimentation in this area and, at present, precludes their use for the identification of hybrids in the field. The results of this study make it clear that hybrid meadowlarks can be identified with accuracy and authority only on the basis of a prior knowledge of the phenotypic recombinations of specific characters in hybrids of known parentage"--P. 24. en_US
dc.format.extent 16810972 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York : [American Museum of Natural History] en_US
dc.relation.ispartofseries Bulletin of the American Museum of Natural History ; v. 134, article 1 en_US
dc.subject.lcc QH1 .A4 vol.134, art.1, 1966 en_US
dc.subject.lcsh Meadowlarks. en_US
dc.subject.lcsh Hybridization. en_US
dc.subject.lcsh Birds -- North America. en_US
dc.title Hybridization in meadowlarks. Bulletin of the AMNH ; v. 134, article 1 en_US
dc.type text en_US

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  • Bulletin of the American Museum of Natural History
    The Bulletin, published continuously since 1881, consists of longer monographic volumes in the field of natural sciences relating to zoology, paleontology, and geology. Current numbers are published at irregular intervals. The Bulletin was originally a place to publish short papers, while longer works appeared in the Memoirs. However, in the 1920s, the Memoirs ceased and the Bulletin series began publishing longer papers. A new series, the Novitates , published short papers describing new forms.

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