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- W652032806 abstract "This study treats Clapper Rails (Rallus longirostris) distributed from the Colorado Valley of Arizona and California southward along the western Mexican mainland to Nayarit. These populations have been described as belonging to three races, i.e. yumanensis (Colorado Valley), rhizophorae (Sonora and northern Sinaloa), and nayaritensis (southern Sinaloa and Nayarit). Our aim was to assess the validity and range of these races and to present detailed descriptions of them. In assigning the races to R. longirostris, rather than to the King Rail (R. elegans), we follow the A.O.U. Check-list (1957). We use brackets to indicate present species assignment of various forms of rails. The U.S. Bureau of Sport Fisheries and Wildlife (1966, 1973) considers R. 1. yumanensis to be an endangered subspecies, and for this reason Tomlinson began field studies of the birds in 1968. In making comparative studies in the Colorado River Valley and northwestern Mexico (Tomlinson and Todd, 1973), Tomlinson became concerned as to the distinctness of yumanensis and rhizophorae of Sonora. After studies had shown that the population and range of the Colorado Valley birds were greater then previously believed, in June 1971 Tomlinson collected a small series of specimens of these rails. He also took specimens from along the west coast of Mexico, south to San Blas, Nayarit. Thirty-four adults and a chick were prepared as study skins and deposited in the National Museum of Natural History (USNM). This material was augmented by previously-taken specimens, so that a total of 58 presumed breeding birds was assembled (birds in freshly molted plumage were not available). Most of the analysis was based on the strictly comparable series of 1971." @default.
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- W652032806 date "1974-01-01" @default.
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- W652032806 title "Taxonomic status of certain clapper rails of southwestern United States and northwestern Mexico" @default.
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