ATRAZINE DOES NOT AFFECT ALGAL BIOMASS OR SNAIL POPULATIONS IN MICROCOSM COMMUNITIES AT ENVIRONMENTALLY RELEVANT CONCENTRATIONS
ATRAZINE DOES NOT AFFECT ALGAL BIOMASS OR SNAIL POPULATIONS IN MICROCOSM COMMUNITIES AT ENVIRONMENTALLY RELEVANT CONCENTRATIONS
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DOI：
10.1002/etc.552
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发表时间：
2011-07-01
影响因子：
4.1
通讯作者：
Hanson, Mark L.
中科院分区：
文献类型：
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作者：
Baxter, Leilan R.;Moore, Dana L.;Hanson, Mark L.
除草剂阿特拉津是一种光合作用抑制剂，在世界各地的农业应用中使用。受处理区域附近地表水的污染可以直接减少非目标水生自养生物的生长，但影响的严重程度高度依赖于物种敏感性和暴露浓度。大型植物或浮游植物衰退所产生的次要影响可能包括更耐受的附生植物群落的扩大。最近，这种自养群落的转变被认为是两栖动物寄生虫感染率增加的一种机制，这种机制是通过水生蜗牛数量的增加来实现的，水生蜗牛是吸虫幼虫的中间宿主。为了进一步阐明这种关系，进行了一项室外微观世界研究，以考察阿特拉津在一系列与环境相关的浓度范围内对初级生产力和钉螺数量的影响。2009年7月，对15个实验池塘进行了处理，使其初始浓度分别为0、1、10、30和100毫克/L阿特拉津。在73d的时间里，对笼养钉螺(Physella spp.)的大型植物、浮游植物和附生植物的生物量、生长和繁殖力进行了测定。和StagNicola elodes)和自由生活的蜗牛(Physella spp.)除了在最高处理水平下水生植物生物量下降外，阿特拉津浓度与任何测量参数之间没有发现一致的关系。将这些结果与以前的研究结果进行比较，突出了相似结构的淡水社区对阿特拉津暴露的反应的差异，即使在浓度高出持续环境水平20倍的情况下也是如此。环境。托昔康。化学。2011；1689-1696；30。(C)2011年SETAC
The herbicide atrazine is a photosynthetic inhibitor used around the world in agricultural applications. Contamination of surface waters adjacent to treated areas can directly reduce growth of nontarget aquatic autotrophs, but the severity of impacts is highly dependent on species sensitivity and exposure concentration. Secondary effects resulting from macrophyte or phytoplankton decline may include an expansion of the more tolerant periphyton community. Recently, this shift in the autotrophic community has been proposed as a mechanism for increased rates of parasite infections in amphibians via augmented populations of aquatic snails which act as intermediate hosts to larval trematodes. To further clarify this relationship, an outdoor microcosm study was conducted to examine the effects of atrazine on primary production and snail populations over a range of environmentally relevant concentrations. In July 2009,15 experimental ponds were treated to achieve initial concentrations of 0, 1, 10,30, and 100 mu g/L atrazine. Over a period of 73 d, measures were taken of macrophyte, phytoplankton, and periphyton biomass, growth, and fecundity of caged snails (Physella spp. and Stagnicola elodes) and free-living snails (Physella spp.). Except for declines in macrophyte biomass at the highest treatment level, no consistent relationships were found between atrazine concentration and any measured parameter. Comparison of these results with previous findings highlights the variability of responses to atrazine exposure between similarly constructed freshwater communities, even at concentrations up to 20 times higher than sustained environmental levels. Environ. Toxicol. Chem. 2011;30:1689-1696. (C) 2011 SETAC