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首页> 外文期刊>Environmental toxicology and chemistry >HEXAZINONE EFFECTS ON STREAM PERIPHYTON AND INVERTEBRATE COMMUNITIES
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HEXAZINONE EFFECTS ON STREAM PERIPHYTON AND INVERTEBRATE COMMUNITIES

机译：己二酮对流周和无脊椎动物群落的影响

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Experiments were conducted in laboratory test chambers and outdoor stream channels to measure the effects of hexazinone on stream periphyton and macroinvertebrate communities. All experimental units were treated at the nominal concentration of 2.7 mg/L, which represents the maximum expected environmental concentration in water from forest vegetation management applications. In laboratory flow-through tests, a 12-h exposure of stream periphyton on natural substrates to hexazinone resulted in a significant reduction in net photosynthetic activity, but no significant effects on periphyton biomass (chlorophyl-a concentration). Recovery from toxic effects was rapid, with no significant differences in photosynthetic activity among treated and control units within 3 h after the hexazinone concentrations were cleared. In stream channels treated for 12 h with hexazinone, there were no significant effects on periphyton biomass and no significant differences in invertebrate drift, compared to control channels. There were also no indications of adverse treatment effects on the invertebrate communities in the stream channels 14 d after the application. The treated and control channels differed in invertebrate community structure, as determined by a stepwise discriminant analysis [Wilks' lambda F equivalent (3, 2)= 127.6, p = 0.007], and this was supported by a two-way ANOVA which showed a significant difference in abundance of macroinvertebrates [F(1, 56) = 10.5, p = 0.002] between treated and control channels, averaged over all taxa. However, subsequent pairwise t tests, when adjusted for multiple comparisons, were unable to identify significant differences between treatment levels for any of the 14 taxa with sufficient data for analysis. Although not significant, the comparison of means showed that abundance of most taxa was higher in the treated channels than in the controls.
机译：在实验室测试室和室外溪流通道中进行了实验，以测量六嗪酮对溪流周围植物和大型无脊椎动物群落的影响。所有实验单元均以2.7 mg / L的名义浓度进行处理，这代表了森林植被管理应用中水中的最大预期环境浓度。在实验室流通测试中，天然底物上的水生附生植物暴露于六嗪酮12小时会导致净光合活性显着降低，但对附生植物生物量（叶绿素a浓度）没有显着影响。从毒性作用中恢复很快，在清除六嗪酮浓度后3小时内，处理和控制单元之间的光合作用活性没有显着差异。与对照通道相比，在用六嗪酮处理了12小时的流道中，对浮游生物的生物量无显着影响，无脊椎动物的漂移也无显着差异。施用后也没有迹象表明对流道14d中的无脊椎动物群落有不利的治疗作用。通过逐步判别分析确定[Wilks的λF当量（3，2）= 127.6，p = 0.007]，无脊椎动物的群落结构和处理通道有所不同，这得到了两方方差分析的支持。经处理和对照的渠道之间，大型无脊椎动物的丰度[F（1，56）= 10.5，p = 0.002]的显着差异，是所有分类单元的平均值。然而，随后的成对t检验在进行多重比较调整后，无法通过足够的数据来分析14种分类单元中任何一种的治疗水平之间的显着差异。均值比较虽然不显着，但显示在处理过的渠道中大多数分类单元的丰度要高于对照。

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