Multiple stressor effects of herbicide, pH, and food on wetland zooplankton and a larval amphibian
Multiple stressor effects of herbicide, pH, and food on wetland zooplankton and a larval amphibian
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DOI：
10.1016/j.ecoenv.2007.08.007
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发表时间：
2008-09-01
影响因子：
6.8
通讯作者：
Folt, C. L.
中科院分区：
文献类型：
--
作者：
Chen, C. Y.;Hathaway, K. M.;Folt, C. L.
除草剂与自然环境压力源（如pH值和食物供应）的相互作用知之甚少。我们在与环境相关的测试浓度（0.25和0.50 mg L-1）下，结合两种pH水平（pH 5.5和7.5）以及两种食物可用性水平（高和低），测试了三氯吡啶（释放(R)）的化学配方。本研究以森林池塘和湿地常见的浮游动物物种绒头猴（Simocephalurs vetulus）和蛙类蝌蚪（Gosner阶段25）为研究对象，研究了每种应激源单独或联合对种群水平的影响。除草剂处理显著降低了两种试验物种的存活率，并显著降低了S. vetulus的繁殖和发育时间，其浓度低于预测的最坏情况环境浓度（2.6 mg L-1）的5-10倍。本实验室研究表明，释放(R)除草剂可能存在毒性作用的风险，这种风险可能因食物可得性低和环境相关浓度下的低pH值而显著增加。(C) 2007爱思唯尔公司版权所有。
Interactions of herbicides and natural environmental stressors such as pH and food availability are poorly understood. We tested a chemical formulation of triclopyr (Release (R)) at environmentally relevant test concentrations (0.25 and 0.50 mg L-1) in combination with two levels of pH (pH 5.5 and 7.5), and two levels of food availability (high and low). Population level effects of each stressor alone and in combination with the others were investigated using Simocephalurs vetulus, a zooplankton species, and Rana pipiens tadpoles (Gosner stage 25), both common to forest ponds and wetlands. Herbicide treatments resulted in significant decreases in survival of both test species as well as reproduction and development time for S. vetulus at levels 5-10 x below predicted worst case environmental concentrations (2.6 mg L-1). This laboratory study demonstrates a probable risk of toxic effects of Release (R) herbicide which may be significantly increased by low food availability and by low pH at environmentally relevant concentrations. (C) 2007 Elsevier Inc. All rights reserved.