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• W2317504934 abstract "Reported is an evaluation (using discriminant and principal component analyses) of the incidence of interbreeding occurring (1) between populations of eastern and western meadowlarks,Sturnella magna and S. neglecta, respectively, from the central and southern Great Plains, and (2) between neglecta and an isolated southwestern population of magna (S. m. lilianae) from the desert grassland of west Texas and eastern New Mexico. Individuals in reference samples taken out of sympatry could be segregated sufficiently to leave a distinct phenetic gap between groups. Evaluation of specimens taken in sympatry also revealed phenetic gaps separating both pairs of meadowlarks, indicating that their genetic integrity is being maintained in both areas of sympatry. Nonetheless, certain specimens from both areas of contact fell in phenetic positions highly intermediate to the reference specimens and were presumed to be of mixed ancestry. There was an apparently higher incidence of intermediate females than males, and it is suggested that females of mixed ancestry have a greater probability of survival than males in the polygynous meadowlarks. The geographic distribution of 16 of the most intermediate specimens from the plains sympatry was such that incidence of intermediates from the Platte River drainage was two to three times higher than that for other drainage systems. Coincidentally, the flood plains of the Platte River system were the only ones examined along which magna was not more or less continuously distributed up to its westernmost point of occurrence. Along the Platte, magna was found only in several small and isolated colonies in which appropriate mate selection may have been rendered difficult by the low numbers of conspecifics and the presumed year to year instability of these colonies. Song was thought to play an important role in selection of conspecific mates. In both zones of sympatry the meadowlarks maintain interspecific territories, and song is important in territory establishment and maintenance. Yet, there has been no convergence toward a common song type in either of the zones of sympatry, despite a considerable information loss when songs are used in interspecific communication. Presumably strong selection opposing interspecific matings has maintained the remarkable differences in songs of these siblings in both areas of sympatry." @default.
• W2317504934 created "2016-06-24" @default.
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• W2317504934 date "1972-09-01" @default.
• W2317504934 modified "2023-10-16" @default.
• W2317504934 title "A Multivariate Assessment of Interbreeding Between the Meadowlarks, Sturnella" @default.
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• W2317504934 doi "https://doi.org/10.1093/sysbio/21.3.313" @default.
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