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首页> 外文期刊>Environmental toxicology and chemistry >COMPARING DIFFERENCES IN SPECIES SENSITIVITY TO TOXICANTS: PHENOTYPIC PLASTICITY VERSUS CONCENTRATION-RESPONSE RELATIONSHIPS
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COMPARING DIFFERENCES IN SPECIES SENSITIVITY TO TOXICANTS: PHENOTYPIC PLASTICITY VERSUS CONCENTRATION-RESPONSE RELATIONSHIPS

机译：比较物种对毒物的敏感性：表型可塑性与浓度-响应关系

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摘要

The comparison of species sensitivity to toxicants is classically derived from differences in the concentration-response relationships of a sensitive trait such as reproduction. We tested this general concept by conceiving the concentration-response relationship as a plastic response to a range of discrete environments. Using a demographic model based on life-cycle experiments for two nematode species (Plectus acuminatus and Heterocephalobus pauciannulatus) we related copper-induced plasticity in reproduction to changes in fitness, which was defined as the population growth rate. Daily reproduction (n_t) in P. acuminatus was more sensitive to copper (EC20 = 48 μM) than in H. pauciannulatus (EC20 = 138 μM). However, the relationship between plasticity in n_1 and fitness showed that for both species, fitness was reduced with 5%. These findings imply that P. acuminatus and H. pauciannulatus are equally susceptible to toxicant-induced changes in n_1 despite their differences in EC20 values for reproduction. It may be concluded that differences in susceptibility of species to toxicants are not only determined by the effect on sensitive traits but also by the relationship between plasticity in this trait and fitness.
机译：物种对毒物敏感性的比较通常是从敏感性状（例如繁殖）的浓度-响应关系的差异中得出的。我们通过将浓度-响应关系理解为对一系列离散环境的可塑性响应来测试了此一般概念。使用基于生命周期实验的两种线虫物种（尖顶侧柏和异头畸形pa）的人口统计模型，我们将铜诱导的繁殖可塑性与适应性变化相关联，这被定义为人口增长率。铜绿假单胞菌的日繁殖量（n_t）对铜（EC20 = 48μM）比铜绿假单胞菌（EC20 = 138μM）更敏感。但是，n_1的可塑性与适应性之间的关系表明，对于两种物种，适应性均降低了5％。这些发现表明，尽管繁殖的EC20值存在差异，但P. acuminatus和H. pauciannulatus同样容易受到毒物诱导的n_1变化的影响。可以得出结论，物种对毒物的敏感性差异不仅取决于对敏感性状的影响，而且还取决于该性状的可塑性与适应性之间的关系。

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