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- W1999154558 abstract "Chromosomal rearrangements such as inversions can facilitate speciation even in the presence of gene flow. The present study aims to analyze the karyotypic variation in six populations of Geophagus brasiliensis from southern Brazil. All specimens showed 2n=48 chromosomes, but three karyotypes were found to have one, two or three pairs of submetacentric chromosomes. Although G. brasiliensis did not exhibit variation in the diploid number, it presented a wide interpopulational variation mainly regarding the karyotype formula and specific chromosomal markers. Differences in the location of the major and minor rDNA loci were observed among the populations. Moreover, different patterns were observed in the distribution of the constitutive heterochromatin, presenting intra- and interpopulational variation. This supports the hypothesis that this taxon represents a complex species or that cryptic species are included in this group, indicating a possibleprocess of sympatric speciation. By potentially restricting gene flow between heterokaryotypes, the segregating chromosome rearrangements we describe for G. brasiliensis may play a role in diversification in this species complex." @default.
- W1999154558 created "2016-06-24" @default.
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- W1999154558 date "2013-10-01" @default.
- W1999154558 modified "2023-10-03" @default.
- W1999154558 title "Trends of karyotypical evolution in the pearl cichlid, Geophagus brasiliensis, from southern Brazil" @default.
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- W1999154558 doi "https://doi.org/10.1016/j.zool.2013.07.002" @default.
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