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首页> 美国卫生研究院文献>other >Population Structure in the Roundtail Chub (Gila robusta Complex) of the Gila River Basin as Determined by Microsatellites: Evolutionary and Conservation Implications
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Population Structure in the Roundtail Chub (Gila robusta Complex) of the Gila River Basin as Determined by Microsatellites: Evolutionary and Conservation Implications

机译：微卫星确定的吉拉河流域圆尾丘（吉拉罗布斯塔复合体）中的种群结构：进化和保护意义

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Ten microsatellite loci were characterized for 34 locations from roundtail chub (Gila robusta complex) to better resolve patterns of genetic variation among local populations in the lower Colorado River basin. This group has had a complex taxonomic history and previous molecular analyses failed to identify species diagnostic molecular markers. Our results supported previous molecular studies based on allozymes and DNA sequences, which found that most genetic variance was explained by differences among local populations. Samples from most localities were so divergent species-level diagnostic markers were not found. Some geographic samples were discordant with current taxonomy due to admixture or misidentification; therefore, additional morphological studies are necessary. Differences in spatial genetic structure were consistent with differences in connectivity of stream habitats, with the typically mainstem species, G. robusta, exhibiting greater genetic connectedness within the Gila River drainage. No species exhibited strong isolation by distance over the entire stream network, but the two species typically found in headwaters, G. nigra and G. intermedia, exhibited greater than expected genetic similarity between geographically proximate populations, and usually clustered with individuals from the same geographic location and/or sub-basin. These results highlight the significance of microevolutionary processes and importance of maintaining local populations to maximize evolutionary potential for this complex. Augmentation stocking as a conservation management strategy should only occur under extreme circumstances, and potential source populations should be geographically proximate stocks of the same species, especially for the headwater forms.
机译：从圆尾（吉拉罗布斯塔复合体）的34个位置表征了10个微卫星基因座，以更好地解决科罗拉多河下游流域本地人群的遗传变异模式。该组有复杂的分类学历史，以前的分子分析未能鉴定出物种诊断性分子标记。我们的研究结果支持了以前基于同工酶和DNA序列的分子研究，该研究发现大多数遗传变异是由当地人群之间的差异所解释的。来自大多数地区的样本都没有发现不同的物种水平诊断标记。由于混合或标识错误，一些地理样本与当前分类法不一致；因此，需要进行其他形态学研究。空间遗传结构上的差异与河流生境的连通性方面的差异一致，典型的主要干物种罗布斯塔氏菌在吉拉河流域内表现出更大的遗传连通性。没有物种在整个河流网络中表现出距离上的强隔离性，但是通常在上游水域中发现的两个物种（G. nigra和G. intermedia）在地理上邻近的种群之间表现出比预期更大的遗传相似性，并且通常与同一地理区域的个体聚在一起位置和/或子盆地。这些结果突出了微进化过程的重要性以及维持本地种群以最大化该复合体的进化潜力的重要性。增强放养作为一种养护管理策略应仅在极端情况下发生，潜在的源种群应在地理上是同一物种的最接近种群，尤其是源头形式。

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