Effects of atrazine on amphibian growth and survival in artificial aquatic communities
Effects of atrazine on amphibian growth and survival in artificial aquatic communities
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DOI：
10.1002/etc.5620191217
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发表时间：
2000-12-01
影响因子：
4.1
通讯作者：
Beasley, VR
中科院分区：
文献类型：
--
作者：
Diana, SG;Resetarits, WJ;Beasley, VR
人工池塘缩影与池塘水，包括浮游植物，附着生物，大型植物，和幼虫灰树蛙（Hyla versicolor），用阿特拉津处理，以达到0，20，200，或2,000 μ g/L的最终水溶液浓度。溶解氧浓度（DO）降至约。在添加阿特拉津后1天内，200和2，000 μ g/L处理组中暴露前值的20%至40%。这些微宇宙中的溶解氧在暴露后10天恢复到对照浓度，但在暴露后21天再次下降到对照值的约60%至80%，并在研究的剩余时间内保持抑郁状态。在200-和2,000-mug/L处理组中，pH值在阿特拉津暴露的1天内相似地降低，并在随后的16天内恢复到对照值。DO和pH在0和20 mug/L组或200和2,000 mug/L组之间没有显著差异。两个较高浓度阿特拉津处理组的青蛙比对照组和低浓度阿特拉津处理组的青蛙在变态时短5%，体重低10%。在0-和20-mug/L组之间或200-和2，000-mug/L组之间，未检测到变态时的长度或体重差异。2,000 μ g/L组的幼虫期比200 μ g/L组长5%，但与任何处理组的对照组无差异。未检测到生存率的显著给药相关差异。两栖动物在变态时的长度和重量的减少可能表明暴露于200至2，000 mug/L阿特拉津的无尾两栖动物野生种群的适合度降低。
Artificial pond microcosms with pond water, including phytoplankton, periphyton, macrophytes, and larval gray tree frogs (Hyla versicolor), were treated with atrazine to achieve final aqueous concentrations of 0, 20, 200, or 2,000 mug/L. Dissolved oxygen concentrations (DO) decreased to approx. 20 to 40% of their preexposure values in the 200- and 2,000-mug/L treatment groups within 1 d of atrazine addition. Dissolved oxygen in these microcosms returned to control concentrations by 10 d after exposure but declined again to approximately 60 to 80% of control values at 21 d after exposure and remained depressed for the remainder of the study. In the 200- and 2,000-mug/L treatment groups, pH decreased similarly within 1 d of atrazine exposure and returned to control values within the following 16 d. The DO and pH did not differ significantly between the 0- and 20-mug/L groups or the 200- and 2,000-mug/L groups. Frogs from the two higher atrazine concentration treatment groups were 5% shorter and had 10% lower body mass at metamorphosis than those from the control and low atrazine concentration groups. No difference in length or body mass at metamorphosis was detectable between the 0- and 20-mug/L groups or between the 200- and 2,000-mug/L groups. Larval period was 5% longer in the 2,000-mug/L group than in the 200-mug/L group but did not differ from controls in any treatment group. No significant treatment-related differences were detected for survival rate. The decrease in amphibian length and weight at metamorphosis may indicate a reduction in fitness in wild populations of anurans exposed to atrazine at 200 to 2,000 mug/L.