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首页> 外文期刊>Journal of genetics >Genetic and morphological variability in South American rodent Oecomys (Sigmodontinae, Rodentia): evidence for a complex of species
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Genetic and morphological variability in South American rodent Oecomys (Sigmodontinae, Rodentia): evidence for a complex of species

机译：南美啮齿类动物小动物（Sigmodontinae，Rodentia）的遗传和形态变异：物种复杂的证据

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The rodent genus Oecomys (Sigmodontinae) comprises a??16 species that inhabit tropical and subtropical forests in Central America and South America. In this study specimens of Oecomys paricola Thomas, 1904 from Bel??m and Maraj?3 island, northern Brazil, were investigated using cytogenetic, molecular and morphological analyses. Three karyotypes were found, two from Bel??m ($2n = 68$, fundamental number (FN) = 72 and $2n = 70$, FN = 76) and a third from Maraj?3 island ($2n = 70$, FN = 72). No molecular or morphological differences were found between the individuals with differing cytotypes from Bel??m, but differences were evident between the individuals from Bel??m and Maraj?3 island. Specimens from Bel??m city region may represent two cryptic species because two different karyotypes are present in the absence of significant differences in morphology and molecular characteristics. The Maraj?3 island and Bel??m populations may represent distinct species that have been separated for some time, and are in the process of morphological and molecular differentiation as a consequence of reproductive isolation at the geographic and chromosomal levels. Thus, the results suggest that O. paricola may be a complex of species.
机译：啮齿动物属昆虫标本（Sigmodontinae）包括居住在中美洲和南美洲的热带和亚热带森林中的16个物种。在这项研究中，使用细胞遗传学，分子学和形态学分析方法研究了巴西北部Bel？m和Maraj？3岛上的Oecomys paricola Thomas，1904年的标本。发现了三种核型，两种来自Bel ?? m（$ 2n = 68 $，基数（FN）= 72和$ 2n = 70 $，FN = 76），第三种来自Maraj？3岛（$ 20n = 70 $）。 ，FN = 72）。在细胞类型与Bel？m不同的个体之间未发现分子或形态学差异，但在Bel？m和Maraj？3岛的个体之间存在明显差异。来自Bel ?? m市地区的标本可能代表两种隐性物种，因为存在两种不同的核型，但在形态和分子特征上没有显着差异。 Maraj？3岛和Bel？m种群可能代表了已经分离了一段时间的独特物种，并且由于地理和染色体水平上的生殖隔离而处于形态和分子分化过程中。因此，结果表明O. paricola可能是物种的复合体。

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