Centro Austral de Investigaciones Científicas (CADIC) - CONICET, Ushuaia, Argentina.
Instituto de Ciencias Polares, Ambiente y Recursos Naturales de la Universidad Nacional de Tierra del Fuego (ICPA-UNTDF), Ushuaia, Argentina.
J Fish Biol. 2020 Apr;96(4):956-967. doi: 10.1111/jfb.14285. Epub 2020 Feb 27.
This study reports the phenotypic and genetic differences between individuals of puyen Galaxias maculatus from two sites in the same river basin in Tierra del Fuego National Park, southern South America. Individuals from the two sampling sites presented morphometric and genetic differences. The morphometric differences indicated that individuals from Laguna Negra (LN) were short and more robust and had large eyes, whereas those from Arroyo Negro (AN) were thin and elongated and had small eyes. Genetic differences showed that AN individuals had a greater genetic structuration and an older demographic history than LN individuals. The results of this study affirmed that the individuals from the two sampling sites belong to different populations with a high degree of isolation. The demographic history could indicate that the individuals of G. maculatus which migrated to northern areas during the last glaciation settled in the Beagle Channel after its formation. The LN population could have originated after the retreat of the glaciers, migrating from AN.
本研究报告了来自南美洲南部火地岛国家公园同一河流流域两个地点的 puyen Galaxias maculatus 个体之间的表型和遗传差异。来自两个采样点的个体表现出形态和遗传差异。形态差异表明，来自 Laguna Negra (LN) 的个体短而粗壮，眼睛大，而来自 Arroyo Negro (AN) 的个体细长，眼睛小。遗传差异表明，AN 个体的遗传结构更为复杂，其种群历史更为古老。本研究的结果证实，来自两个采样点的个体属于具有高度隔离的不同种群。种群历史可能表明，在最后一次冰川期迁移到北部地区的 G. maculatus 个体在比格尔海峡形成后定居下来。LN 种群可能是在冰川退缩后从 AN 迁移而来的。
