Retention versus drift: genetic population structure of Cod Icefishes and Crocodile Icefishes in the Scotia Sea

应通过调查选定物种的线粒体和核DNA序列以及微卫星标记，确定横跨斯科舍海岭的南极鱼类（南极鱼亚目、真骨鱼亚目）的遗传多样性、种群结构和种群地理。我们目前的研究表明，低遗传分化的物种与持久的远洋幼虫阶段，但基因流可能是高度定向。不同的生活史策略的物种之间的进一步比较分析将研究幼虫模式和幼虫阶段持续时间在人口结构中的作用。总的来说，了解种群遗传结构对于保护生物多样性以及提高我们对进化途径的认识，例如地理、水文和繁殖方式对南极环境中扩散和物种形成的影响，都很重要。

Genetic diversity, population structure and phylogeography of Antarctic fish (Notothenioidei, Teleostei) across the Scotia Ridge shall be determined by investigating mitochondrial and nuclear DNA sequences and microsatellite markers of selected species. Our current studies have shown low genetic differentiation for species with protracted pelagic larval phases but that gene flow may be highly directional. Further comparative analyses between species with differing life-history strategies will examine the role of larval modes and larval phase durations in population structuring. In general, knowledge on population genetic structure is important for the preservation of biological diversity as well as to improve our understanding of evolutionary pathways such as the influence of geography, hydrography and reproduction mode on dispersal and speciation in the Antarctic environment.