文献类型： 外文期刊

第一作者： Lowey, J.

作者： Lowey, J.;Rogers, S. M.;Cheng, Q.;Mee, J. A.

作者机构： Univ Calgary, Dept Biol Sci, Calgary, AB T2N 1N4, Canada;Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Key Lab Ocean & Polar Fisheries, Minist Agr, Shanghai 200090, Peoples R China;Mt Royal Univ, Dept Biol, Calgary, AB T3E 6K6, Canada

关键词： adaptation; assortative mating; disruptive selection; major effect locus; brook stickleback; Culaea inconstans

期刊名称：CANADIAN JOURNAL OF ZOOLOGY （ 2020影响因子：1.597； 五年影响因子：1.637 ）

ISSN： 0008-4301

年卷期： 2020 年 98 卷 10 期

页码：

收录情况： SCI

摘要： In the stickleback family (Gasterosteidae), divergence in pelvic morphology is typically associated with reproductive isolation and ecological niche specialization. In this study, we assessed whether reproductive isolation may be involved in the persistence of within-lake polymorphism in brook stickleback (Culaea inconstans (Kirtland, 1840)). We studied populations of brook stickleback in central Alberta, Canada, that are polymorphic for pelvic reduction (i.e., presence-absence of pelvic spines). We investigated the persistence of the pelvic polymorphisms over 40 generations in five lakes. We found that, of the five populations examined, the frequencies of pelvic phenotypes have remained unchanged in three populations, the polymorphism has persisted with significantly changed frequencies of pelvic phenotypes in one population, and the polymorphism has been lost in one population. Using 10 microsatellite loci, we observed low genetic divergence between individuals with and without pelvic spines in one lake, suggesting a lack of assortative mating among individuals with divergent pelvic phenotypes. This observation suggests that the pelvic polymorphism in brook stickleback persists due to balancing selection in the absence of reproductive isolation, although the selective forces were not evaluated. The significant changes in phenotypic frequencies in two populations are likely associated with environmental disturbances such as species introductions.

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