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首页> 外文期刊>Environmental toxicology and chemistry >Fitness cost of resistance to cadmium in the least killifish (Heterandria formosa).
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Fitness cost of resistance to cadmium in the least killifish (Heterandria formosa).

机译：最少的鱼类（Heterandria formosa）对镉的抗性适应成本。

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摘要

Fitness costs constrain the evolution of resistance to environmental stress in populations. We earlier reported on a rapid response to laboratory selection for cadmium resistance in the least killifish (Heterandria formosa). By the sixth generation, the three selection populations were threefold more resistant to cadmium than the control populations. Here, we report the fitness costs and trade-offs associated with this evolution of resistance. In the F3 and F4 generations, the selection populations produced smaller-sized offspring than the control populations. A comprehensive life-history traits study in the F7 generation showed that the selection populations had, on average, an 18% decrease in fecundity. The selection populations also had a smaller brood size, longer time to first reproduction, and shorter female life expectancy than the control populations. Our results strongly suggest that fitness costs and trade-offs were associated with the evolution of resistance to cadmium in the least killifish. The fitness costs and trade-offs may result from maintenance of the underlying resistance mechanisms, leading to changes in resource allocation in the cadmium-adapted fish.
机译：健身费用限制了人们对环境压力的抵抗力的发展。我们之前曾报道过，对最不常见的鱼类（Heterandria formosa）对镉抗性的实验室选择具有快速反应。到第六代时，三个选择种群对镉的抗性比对照种群高三倍。在这里，我们报告了与抗性进化相关的适应性成本和权衡取舍。在F3和F4代中，选择种群产生的后代比对照种群小。在F7代中进行的一项综合的生活史特征研究表明，所选种群的繁殖力平均降低了18％。与对照种群相比，选择种群的育雏规模更小，首次繁殖的时间更长，女性预期寿命更短。我们的研究结果强烈表明，适度成本和权衡取舍与最不常见鱼类对镉的抗性进化有关。适应性成本和权衡取舍可能来自维持潜在的抗性机制，从而导致适应镉的鱼的资源分配发生变化。

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