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首页> 外文期刊>Limnologica >Baseline assessment of benthic macroinvertebrate community structure and ecological water quality in Rwenzori rivers (Albertine rift valley, Uganda) using biotic-index tools
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Baseline assessment of benthic macroinvertebrate community structure and ecological water quality in Rwenzori rivers (Albertine rift valley, Uganda) using biotic-index tools

机译：基线评估Benthic Macroinvertebrate群落结构和Rwenzori Rivers（阿尔伯塔河裂谷，乌干达）的生态水质使用生物索引工具

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摘要

The Rwenzori Mountains and Albertine Rift region of southwestern Uganda are part of a globally recognized biodiversity hotspot, but are currently facing pressures from intensified agriculture, mineral exploitation and hydroelectric power generation. This study was undertaken to assess the ecological water quality of Rwenzori rivers using biomonitoring metrics to determine the major factors shaping macroinvertebrate community structure in disturbed and undisturbed sites. We sampled macroinvertebrates at 66 sites along headwater tributaries and downstream areas of the Nyamwamba, Mubuku and Nyamugasani rivers, supplemented by five sites along the Kazinga channel and Lake George wetland, and identified a total of 32,579 macroinvertebrates to family level. Insecta was the most diverse taxon (45 families). Based on Average Score Per Taxon (ASPT) scores, sites were classified into four ecological water quality groups as excellent (40 sites), good (16), fair (7) and poor (8). Upstream sites had the highest abundance of pollution-sensitive families such as Caenidae and Hydropsychidae, while downstream sites had high numbers of Chironomidae. Lorenz curves revealed a low degree of evenness with Gini coefficient values ranging from 0.75 to 0.94. Ordination analysis revealed that total phosphorus, specific conductivity, chloride and chemical oxygen demand were key environmental variables contributing to variation among the sites. The majority of sites did show little to no anthropogenic influence with the exception of downstream sites. The results of this study provide useful baseline reference data, to assess and better manage the impacts of anthropogenic activities on the ecological integrity of the region's aquatic systems. Furthermore, these datasets will advance the development of a regional family-level biotic index.
机译：乌干达西南部的Rwenzori山脉和阿尔伯特裂谷地区是全球公认的生物多样性热点的一部分，但目前正在面临着强化农业，矿物开采和水力发电的压力。本研究采用了利用生物监测指标来评估Rwenzori Rivers的生态水质，以确定在干扰和未受干扰的地点中塑造大型脊椎动物群落结构的主要因素。我们在沿着南瓜河道和尼莫瓦萨尼河的下游地区的66个地点进行了在66个地点进行了采样的，补充了沿着Kazinga渠道和乔治湖湿地的五个地点，并确定了32,579名Macroinvertebrate给家庭水平。昆虫是最多的分类分类（45个家庭）。基于每分类分类的平均分数（ASPOS）得分，地点被分为四个生态水质群体，如优秀（40个地点），良好（16），公平（7）和穷人（8）。上游网站具有最高丰富的污染敏感家庭，如Caenidae和Hypropopyyae，而下游部位有很多的曲静脉。 Lorenz曲线揭示了低均匀度，基尼系数值范围为0.75至0.94。排序分析显示，总磷，特定导电性，氯化物和化学需氧量是有助于遗址变异的关键环境变量。除下游地点外，大多数网站都表现出没有人为影响。该研究的结果提供了有用的基线参考数据，以评估和更好地管理人为活动对该地区水生系统的生态完整性的影响。此外，这些数据集将推进区域家庭级别生物指数的发展。

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