Data from: A test for within-lake niche differentiation in the nine-spined sticklebacks (Pungitius pungitius)

Specialization for the use of different resources can lead to ecological speciation. Accordingly, there are numerous examples of ecologically specialized pairs of fish “species” in postglacial lakes. Using a polymorphic panel of single nucleotide variants, we tested for genetic footprints of within-lake population stratification in nine-spined sticklebacks (Pungitius pungitius) collected from three habitats (viz. littoral, benthic, and pelagic) within a northern Swedish lake. Analyses of admixture, population structure, and relatedness all supported the conclusion that the fish from this lake form a single interbreeding unit.

不同资源利用特化可引发生态物种形成。据此，冰后湖泊中存在诸多生态特化的鱼类"物种"对案例。本研究借助单核苷酸变异（single nucleotide variants）多态性分型面板，对采自瑞典北部某湖泊三类生境（即沿岸带、底栖带与浮游带）的九棘刺鱼（Pungitius pungitius）开展湖内种群分层的遗传印记检测。遗传混合分析、种群结构分析与亲缘关系分析均证实，该湖泊内的鱼类构成一个统一的杂交繁殖单元。