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首页> 外文期刊>Environmental toxicology and chemistry >COPPER TOLERANCE IN FATHEAD MINNOWS: Ⅰ. THE ROLE OF GENETIC AND NONGENETIC FACTORS
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COPPER TOLERANCE IN FATHEAD MINNOWS: Ⅰ. THE ROLE OF GENETIC AND NONGENETIC FACTORS

机译：FAT头小铜公差：Ⅰ。遗传和非遗传因素的作用

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摘要

Swim performances of male and female fathead minnows (Pimephales promelas) from three different suppliers were determined before and after an 8- to 9-d exposure to 175 μg/L copper (Cu). The reduction in swim performance (delta) due to the Cu exposure varied widely among individual fish, but was surprisingly consistent from one supplier to the next and between males and females. Genetic analysis of the individuals revealed significant correlations between delta and genotypic variation at the glucosephosphate isomerase-1, phosphoglucomutase-1, and lactate dehydrogenase-2 enzyme loci. Based upon delta, the most Cu-resistant fathead minnows were bred together, as were the most Cu-susceptible individuals and two groups of unselected minnows. Larvae produced by each group of adults were subjected to a survival test. The median lethal concentration (LC50) for larvae produced by Cu-resistant adults was significantly greater than the LC50s for the control groups. Surprisingly, the LC50 for the larvae produced by Cu-susceptible adults was also significantly greater than the LC50s for the control groups, but not significantly different from the larvae produced by Cu-resistant parents. While Cu tolerance has a genetic component in fathead minnows, the Cu tolerance of larval fish appears to be influenced by nongenetic as well as genetic factors.
机译：在暴露于175μg/ L铜（Cu）的8至9天之前和之后，确定了来自三个不同供应商的雄性和雌性黑头head鱼（Pimephales promelas）的游泳表现。铜暴露导致的游泳成绩降低（δ）在各条鱼中差异很大，但是令人惊讶的是，从一个供应商到下一个供应商以及在雄性和雌性之间都是一致的。个体的遗传分析显示，在葡萄糖磷酸异构酶-1，磷酸葡萄糖突变酶-1和乳酸脱氢酶-2酶基因座的δ和基因型变异之间存在显着相关性。根据三角洲，将最耐铜的黑头now鱼繁殖在一起，将最易感铜的个体和两组未选择的min鱼也繁殖在一起。每组成年人产生的幼虫都要进行生存测试。耐铜成人产生的幼虫的平均致死浓度（LC50）明显大于对照组的LC50。令人惊讶的是，易患铜的成年人产生的幼虫的LC50也显着大于对照组的LC50，但与抗铜亲代产生的幼虫没有显着差异。尽管铜耐受性在fat鱼中具有遗传成分，但幼鱼对铜的耐受性似乎受非遗传因素和遗传因素的影响。

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