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首页> 外文期刊>African Journal of Aquatic Science >The impact of feedlot effluent on water quality and aquatic macroinvertebrate community structure in streams of the upper Vaal River catchment, South Africa
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The impact of feedlot effluent on water quality and aquatic macroinvertebrate community structure in streams of the upper Vaal River catchment, South Africa

机译：饲养场污水对南非瓦尔河上游流域水质和大型无脊椎动物群落结构的影响

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摘要

The impact of three intensive feedlots on aquatic macroinvertebrate community structure under high and low flows in the upper Vaal catchment was investigated. Water quality variables recorded upstream and downstream of feedlot activity include pH, dissolved oxygen, conductivity, temperature, turbidity, chloride, phosphate, sulphate, ammonium, nitrite, nitrate and chemical oxygen demand. Differences in water quality between upstream and downstream sites included nutrient concentrations, pH and conductivity. Alterations in family-level invertebrate community structures indicated a decline in abundances and species richness at sites situated downstream of feedlots. SIMPER analysis reflected invertebrate similarities for upstream and downstream sites for both low-flow and high-flow surveys. Downstream similarities of 59.03%, 69.26% and 63.92% were recorded. Some clear seasonal influences occurred. Redundancy analysis, using water quality variables and taxonomic orders, explained 80.3%, 81.3% and 86.0% of the variances recorded.
机译：研究了三个集约化饲养场对上瓦尔流域高流量和低流量下水生大型无脊椎动物群落结构的影响。饲养场活动上游和下游记录的水质变量包括pH值，溶解氧，电导率，温度，浊度，氯化物，磷酸盐，硫酸盐，铵，亚硝酸盐，硝酸盐和化学需氧量。上游和下游站点之间的水质差异包括养分浓度，pH和电导率。家庭级无脊椎动物群落结构的变化表明，位于饲养场下游的站点的丰度和物种丰富度下降。 SIMPER分析反映了低流量和高流量调查的上游和下游站点的无脊椎动物相似性。下游相似度分别为59.03％，69.26％和63.92％。发生了一些明显的季节性影响。使用水质变量和分类顺序进行的冗余分析解释了所记录差异的80.3％，81.3％和86.0％。

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