Acute toxicity of potentially toxic elements on ciliated protozoa from Lake Maracaibo (Venezuela)

Q2 Environmental Science Acta Limnologica Brasiliensia Pub Date : 2022-01-01 DOI:10.1590/s2179-975x7821
Julio César Marín-Leal, Neil José Rincón-Miquilena, L. Díaz-Borrego, María Carolina Pire-Sierra
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Abstract

Abstract: Aim In this article the acute ecotoxicological effects of Cr(III), Cr(VI), Cd(II) and V(V) on ciliated protozoa isolated from Lake Maracaibo were evaluated, by estimating of the LC50 for an exposure time of 1-h and observations every 5 min. Methods Isolations and cultures of ciliated protozoa were made from surface water samples to then carry out toxicity essays under static and controlled conditions, identifying cell immobility (death) as the endpoint. Results The response of the ciliated protozoa made it possible to unequivocally determine the acute toxicity in presence of potentially toxic elements (PTE), with variable mortalities depending on the gender, the element tested and its concentration. The results obtained with Euplotes sp. indicate that protozoan is a sensitive biomonitor indicated for the biomonitoring of PTE contamination in Lake Maracaibo. Conclusions The use of shorter exposure periods offers opportunities to show early toxicity effects on natural populations and to act in a timely manner (early warning systems) in contamination events by PTEs, as well as the development of sensitive and rapid biomonitoring methods for detection of these elements in the environment.
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潜在有毒元素对委内瑞拉马拉开波湖纤毛原生动物的急性毒性研究
摘要:目的研究Cr(III)、Cr(VI)、Cd(II)和V(V)对马拉开波湖中分离的原生纤毛虫的急性生态毒理学效应,测定接触时间为1 h,每隔5 min观察一次的LC50。方法对地表水中分离培养的原生纤毛虫进行静态和受控条件下的毒性实验,以细胞静止不动(死亡)为终点。结果纤毛原生动物对潜在有毒元素(PTE)的反应可以明确地确定潜在有毒元素(PTE)存在的急性毒性,其死亡率取决于性别、所测元素及其浓度。结果表明,原生动物是马拉开波湖PTE污染监测的灵敏生物监测工具。结论:使用较短的暴露时间可以提供机会显示对自然种群的早期毒性效应,并在pte污染事件中及时采取行动(早期预警系统),以及开发敏感和快速的生物监测方法来检测环境中这些元素。
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来源期刊
Acta Limnologica Brasiliensia
Acta Limnologica Brasiliensia Environmental Science-Ecology
CiteScore
2.20
自引率
0.00%
发文量
17
审稿时长
50 weeks
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