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Geographic Patterns of Genetic Variation and Conservation Consequences in Three South American Rodents

机译:南美三只啮齿动物遗传变异和保护后果的地理格局

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In this study, the geographic patterns of genetic variation of three rodent species belonging to the tribe Oryzomyini were investigated using the mitochondrial cytochrome b and nuclear IRBP genes in biomes that are undergoing degradation processes to a greater or lesser degree. The samples are from 25 collecting localities distributed throughout the Amazon, Cerrado, Atlantic Forest, and Pampa biomes. The results show that the three species have a population and geographic structure, besides being in demographic equilibrium. The phylogenetic analyses performed on Euryoryzomys russatus and Hylaeamys megacephalus showed these specimens grouped in three distinct clades forming geographic gradients (North–South direction in H. megacephalus). Intraspecific genetic divergence was higher in H. megacephalus (4.53%), followed by E. russatus (1.79%), and lowest in Sooretamys angouya (0.88%). The results obtained indicate that, necessarily, the management strategies to preserve genetic diversity should be different for each species, since each of them presented specific population parameters.
机译:在这项研究中,使用线粒体细胞色素b和核IRBP基因在经历或多或少降解的生物群落中调查了Oryzomyini部落三个啮齿动物物种遗传变异的地理模式。样本来自分布在整个亚马逊,塞拉多,大西洋森林和潘帕生物群落中的25个采集地点。结果表明,这三个物种除了处于人口均衡状态外,还具有种群和地理结构。对Euryoryzomys russatus和Hylaeamys megacephalus进行的系统发育分析表明,这些标本分为三个不同的进化枝,形成地理梯度(H. megacephalus的南北方向)。巨大头颅内种内遗传差异较高(4.53%),其次是鲁氏肠杆菌(1.79%),而在Sooretamys angouya中最低(0.88%)。获得的结果表明,由于每个物种都具有特定的种群参数,因此每个物种的遗传多样性保护策略必然有所不同。

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