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首页> 外文期刊>Environmental toxicology and chemistry >ECOTOXICOLOGICAL RESPONSES OF THE MAYFLY BAETIS TRICAUDATUS TO DIETARY AND WATERBORNE CADMIUM: IMPLICATIONS FOR TOXICITY TESTING
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ECOTOXICOLOGICAL RESPONSES OF THE MAYFLY BAETIS TRICAUDATUS TO DIETARY AND WATERBORNE CADMIUM: IMPLICATIONS FOR TOXICITY TESTING

机译：五月BA对饮食和水性镉的生态毒理学反应：毒性测试的意义

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摘要

Trace metals readily accumulated by stream periphyton may enter aquatic food chains through grazer ingestion. Hence, experiments were conducted to determine the ecotoxicological responses of the grazing mayfly Baetis tricaudatus to dietary cadmium. Short-term feeding experiments indicated that B. tricaudatus nymphs did not initially avoid grazing on cadmium-contaminated diatom mats. During a partial life-cycle experiment, 4 and 10 μg/g of dietary cadmium significantly inhibited grazing, whereas 10 μg/g significantly inhibited growth. Feeding inhibition was the likely mechanism that inhibited growth (i.e., through reduced energy intake). Conversely, when exposed to waterborne cadmium using lethal toxicity test procedures, B. tricaudatus nymphs were relatively tolerant (96-h median lethal concentration, 1,611 μg/L). Thus, sublethal responses to dietary exposure appeared to be more sensitive than lethal responses to waterborne exposure. Because adult mayfly fecundity is a function of nymph size at emergence, dietary cadmium exposure could increase the extinction probability within mayfly populations. The present study highlights the importance of dietary exposure routes in determining the ecotoxicological responses of an organism to a contaminant. Furthermore, the findings emphasize the advantage of evaluating a combination of ecologically relevant, lethal and sublethal endpoints in laboratory methods used to generate data for ecological risk assessment and regulation.
机译：易被溪流附生生物蓄积的痕量金属可能会通过食草动物的摄入而进入水生食物链。因此，进行了实验以确定放牧的fly（Baetis tricaudatus）对膳食镉的生态毒理反应。短期喂养实验表明，三头弯曲杆菌若虫最初并未避免在被镉污染的硅藻垫上放牧。在部分生命周期实验中，4和10μg/ g的膳食镉显着抑制放牧，而10μg/ g的显着抑制生长。进食抑制是抑制生长的可能机制（即通过减少能量摄入）。相反，当使用致命毒性测试程序将水生镉暴露于水中时，Tricaudatus若虫会相对耐受（96小时中位致死浓度为1,611μg/ L）。因此，对饮食接触的亚致死反应似乎比对水接触的致死反应更为敏感。由于成年may的繁殖力是若虫出现时若虫大小的函数，因此饮食中镉的暴露可能会增加may蝇种群内的灭绝概率。本研究强调了饮食接触途径对确定生物体对污染物的生态毒理反应的重要性。此外，研究结果强调了在实验室方法中评估生态相关，致死和亚致死指标组合的优势，该方法用于生成用于生态风险评估和监管的数据。

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