Benton M J, Diamond S A, Guttman S I
Department of Zoology, Miami University, Oxford, Ohio 45056.
Ecotoxicol Environ Saf. 1994 Oct;29(1):20-37. doi: 10.1016/0147-6513(94)90027-2.
Genetic and morphometric data from freshwater snail (Helisoma trivolvis) and mosquitofish (Gambusia holbrooki) populations from a relatively clean and a severely contaminated habitat were compared. Within the clean habitat, snail genetic patterns may have been more influenced than those of mosquitofish by site-specific selection because of the lesser likelihood of gene flow among snail subpopulations. Distinct genetic patterns within the contaminated habitat, combined with data from other published work, suggest that selection for tolerant genotypes may have occurred in both species. Body size in both species was associated with glucosephosphate isomerase allozyme genotype. In snails, apparent selection for a particular allele in the contaminated habitat may be related to its contaminant tolerance and body-size plasticity. In mosquitofish, a particular genotype associated with small body size appears to have been favored in the contaminated environment.
对来自相对清洁和严重污染栖息地的淡水蜗牛（三旋膀胱螺）和食蚊鱼（霍氏食蚊鱼）种群的遗传和形态测量数据进行了比较。在清洁栖息地内，由于蜗牛亚种群间基因流动的可能性较小，蜗牛的遗传模式可能比食蚊鱼的遗传模式更容易受到特定地点选择的影响。受污染栖息地内不同的遗传模式，再结合其他已发表研究的数据，表明这两个物种可能都发生了对耐受基因型的选择。两个物种的体型都与葡萄糖磷酸异构酶同工酶基因型有关。在蜗牛中，在受污染栖息地对特定等位基因的明显选择可能与其对污染物的耐受性和体型可塑性有关。在食蚊鱼中，与小体型相关的特定基因型在受污染环境中似乎更受青睐。
