Pinckney James L, Ornólfsdóttir Erla B, Lumsden S Elizabeth
Department of Oceanography, 3146 TAMU, Texas A&M University, College Station TX 77843-3146, USA.
Mar Pollut Bull. 2002 Oct;44(10):1109-16. doi: 10.1016/s0025-326x(02)00165-0.
Atrazine is a common agricultural herbicide that is readily transported into estuaries through surface water runoff. In this study, we determined the short-term (24-48 h) sublethal effects of atrazine on estuarine phytoplankton biomass and community composition. Phytoplankton group-specific responses to atrazine exposure (25 microgh(-1)) were measured using natural water samples collected from two locations in Galveston Bay, Texas. Addition bioassays, coupled with HPLC pigment analysis, were used to quantify changes in the relative abundances of algal groups. For all algal groups except prasinophytes, the addition of atrazine in combination with nitrate was not significantly different from nitrate additions alone. These results suggest no significant negative effect of atrazine on phytoplankton under the specified environmental conditions for the bioassays. Although low concentrations of atrazine may have minimal impacts on phytoplankton, herbicide loadings need to be further characterized before generalizations can be applied to estuarine and coastal ecosystems.
阿特拉津是一种常见的农业除草剂，它很容易通过地表径流进入河口。在本研究中，我们测定了阿特拉津对河口浮游植物生物量和群落组成的短期（24 - 48小时）亚致死效应。使用从得克萨斯州加尔维斯顿湾两个地点采集的天然水样，测量了浮游植物特定类群对阿特拉津暴露（25微克/升）的反应。添加生物测定法与高效液相色谱色素分析相结合，用于量化藻类类群相对丰度的变化。对于除绿藻纲以外的所有藻类类群，添加阿特拉津与硝酸盐的组合与单独添加硝酸盐没有显著差异。这些结果表明，在生物测定的特定环境条件下，阿特拉津对浮游植物没有显著的负面影响。尽管低浓度的阿特拉津可能对浮游植物影响最小，但在将其推广应用于河口和沿海生态系统之前，需要进一步确定除草剂的负荷量。
