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首页> 外文期刊>Genetics and Molecular Research >Fine-scale genetic structure patterns in two freshwater fish species, Geophagus brasiliensis (Osteichthyes, Cichlidae) and Astyanax altiparanae (Osteichthyes, Characidae) throughout a Neotropical stream
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Fine-scale genetic structure patterns in two freshwater fish species, Geophagus brasiliensis (Osteichthyes, Cichlidae) and Astyanax altiparanae (Osteichthyes, Characidae) throughout a Neotropical stream

机译：在整个新热带流中，两种淡水鱼类物种巴西乳杆菌（Osteichthyes，丽鱼科）和Astyanax altiparanae（Osteichthyes，Characidae）的精细尺度遗传结构模式

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Streams are very important environments for Neotropical freshwater fish fauna, and possess a high number of species. These small drainages are also highlighted by their intrinsic biological and physicochemical features; however, knowledge on the genetic distribution of fish in these drainages is limited. Therefore, in the present study, RAPD (random amplified polymorphic DNA) and microsatellite markers were used to analyze population differentiation and gene flow of Astyanax altiparanae and Geophagus brasiliensis from three sites (high, medium, and low) throughout the Penacho stream (about 32 km long), which is a Neotropical stream. Both markers revealed higher levels of genetic diversity levels for A. altiparanae (Pˉ: 90.05; HS: 0.350) compared to G. brasiliensis (Pˉ: 30.43; HS: 0.118), which may be related to the particular biology of each species. AMOVA revealed significant genetic variation among populations of each species. All pairwise ΦST values were significant, ranging from 0.020 to 0.056 for A. altiparanae samples, and from 0.065 to 0.190 for G. brasiliensis samples. Bayesian clustering analysis corroborated these results and revealed clusters of both A. altiparanae (two based on RAPD data) and G. brasiliensis (two based on RAPD data and three on microsatellite data). Gene flow estimates showed that there were similar rates of migration among A. altiparanae samples and low rates of migration among some G. brasiliensis samples. These results suggest patterns of fine-scale genetic structure for both species in the Penacho stream. This information may enhance knowledge of Neotropical streams and may be useful for future management and conservation activities.
机译：溪流是新热带淡水鱼类动物群非常重要的环境，并拥有许多种类。这些小排水渠还具有其固有的生物学和物理化学特征;但是，关于这些流域鱼类遗传分布的知识是有限的。因此，在本研究中，使用RAPD（随机扩增多态性DNA）和微卫星标记从整个Penacho流（约32个）的三个位置（高，中和低）分析了Astyanax altiparanae和Brathiliana的种群分化和基因流。公里长），这是一条新热带流。两种标记均显示出与巴西甘草（Pˉ：30.43; HS：0.118）相比，拟南芥的遗传多样性水平较高（Pˉ：90.05; HS：0.350），这可能与每种物种的特定生物学有关。 AMOVA揭示了每个物种种群之间的显着遗传变异。所有成对的ΦST值均显着，对于拟南芥样品而言，范围从0.020到0.056，对于巴西布鲁霉样品而言，范围从0.065到0.190。贝叶斯聚类分析证实了这些结果，并揭示了A. altiparanae（两个基于RAPD数据）和G.brasiliensis（两个基于RAPD数据和三个基于微卫星数据）的聚类。基因流量估计结果表明，在拟南芥样品之间有相似的迁移率，而在某些巴西巴西栗样品中有较低的迁移率。这些结果表明佩纳乔河中两个物种的精细规模遗传结构的模式。此信息可能会增强新热带流的知识，并且可能对将来的管理和保护活动有用。

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