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Development of macroinvertebrate multimetric index for ecological evaluation of a river in North Central Nigeria

机译：尼日利亚中北部河流生态评估的大型无脊椎动物多指标指标的开发

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摘要

A macroinvertebrate-based multimetric index was developed for River Chanchaga, North Central Nigeria. Macroinvertebrates and physicochemical variables were sampled seasonally between March 2017 and February 2018 from four stations: station 1 (least impacted control station) and three downstream stations 2, 3 and 4. A total of 29 macroinvertebrate metrics in four categories, richness, abundance, composition and diversity, were evaluated for their potential to discriminate between the stations, seasonal stability and redundancy. Of the 29 metrics, only 13 fulfilled all criteria and were then integrated into the final Chanchaga multimeric index (MMIchanchaga). Application of the newly developed multimetric index revealed that water quality at stations 2 and 3 was fair and that of station 4 was poor. Water quality deteriorated slightly during the rainy season compared with the dry season. In terms of the individual component metrics, EPT richness, EPT (%) and Shannon diversity were highly sensitive to water quality impairment. The Bray-Curtis similarity measure revealed that stations 2 and 3 were more similar compared with the similarity between other stations. Overall, the newly developed multimetric index proved useful and represents the first important step in such index development in Nigeria.
机译：为尼日利亚中北部的恰恰加河开发了基于无脊椎动物的多指标索引。在2017年3月至2018年2月之间，按季节从以下四个站点采样大型无脊椎动物和理化变量：第1站点（受影响最严重的控制站）和三个下游站点2、3和4.共有29种大型无脊椎动物指标，涉及四个类别（丰富度，丰度，组成）评估了它们在区分电台，季节稳定性和冗余性方面的潜力。在这29个指标中，只有13个满足所有标准，然后被整合到最终的Chanchaga多聚指数（MMIchanchaga）中。应用新开发的多指标指数显示，第2和第3站的水质中等，第4站的水质较差。与旱季相比，雨季的水质略有下降。就单个组成指标而言，EPT含量，EPT（％）和香农多样性对水质损害高度敏感。 Bray-Curtis相似性度量显示，与其他站点之间的相似度相比，站点2和3更加相似。总的来说，新开发的多指标索引被证明是有用的，并且代表了尼日利亚这种指标发展的第一步。

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