Fine-scaled genetic structuring, as seen for example in many lacustrine fish, typically relates to the patterns of migration, habitat use, mating system or other ecological factors. Because the same processes can also affect the propensity of population differentiation and divergence, assessments of species from rapidly speciating clades, or with particularly interesting ecological traits, can be especially insightful. For this study, we assessed the spatial genetic relationships, including the genetic evidence for sex-biased dispersal, in a colony-breeding cichlid fish, Amphilophus astorquii, endemic to Crater Lake Apoyo in Nicaragua, using 11 polymorphic microsatellite loci (n = 123 individuals from three colonies). We found no population structure in A. astorquii either within colonies (no spatial genetic autocorrelation, r ~0), or at the lake-wide level (pairwise population differentiation FST = 0–0.013 and no clustering), and there was no sex-bias (male and female AIc values bounded 0) to this lack of genetic structure. These patterns may be driven by the colony-breeding reproductive behaviour of A. astorquii. The results suggest that strong philopatry or spatial assortative mating are unlikely to explain the rapid speciation processes associated with the history of this species in Lake Apoyo.
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机译:如在许多湖泊鱼类中看到的那样,精细的遗传结构通常与迁徙,栖息地利用,交配系统或其他生态因素有关。由于相同的过程也可能影响种群分化和分化的倾向,因此对来自迅速形成的进化枝或具有特别有趣的生态特征的物种进行评估尤其有见地。在这项研究中,我们使用11个多态微卫星基因座(n = 123个个体)评估了尼加拉瓜Crater Lake Apoyo特有的殖民地繁殖的丽鱼科鱼类Amphilophus astorquii的空间遗传关系,包括性别偏向的遗传证据。来自三个殖民地)。我们发现在群落内(无空间遗传自相关,r〜0)或在全湖范围内(种群的成对分化FST = 0-0.013,并且没有聚类),A。astorquii没有种群结构,并且没有性别-对这种缺乏遗传结构的偏见(男性和女性AIc值限制为0)。这些模式可能是由A. astorquii的菌落繁殖繁殖行为驱动的。结果表明,强烈的盖氏学或空间分类交配不可能解释与阿波约湖中该物种的历史有关的快速物种形成过程。
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