开发一个多指标指数,用于评估埃塞俄比亚塔纳湖次流域东北部部分选定河流的生态完整性

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
Amelework Zewudu, G. Beneberu, Minwyelet Minigst, A. Mezgebu
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引用次数: 2

摘要

利用底栖大型无脊椎动物制定了一个多指标指数,以评估埃塞俄比亚塔纳湖次流域东北部选定河流的生态健康状况。在2016年后雨季(11月至12月)进行了一次大规模采样。使用Surber采样器和D型框架网在20个地点采集大型无脊椎动物。根据测量的物理化学变量,采样点分为参考文献(n=8)和试验点(n=4)。测试了大约30个潜在的候选指标,并选择了5个指标作为核心指标:蜉蝣目丛翅目毛翅目分类群的数量、蜉蝣目的个体百分比、EPT个体的百分比、切碎机的百分比和滤食性的百分比。这些指标在0到10的连续范围内进行评分。为了开发塔纳湖次盆地多指标指数(LTSBMI),将分数相加并按比例缩放,得出从0到100的分数。最终指数分为五个水质等级:“非常好”、“好”、‘一般’、“差”和“非常差”。LTSBMI在区分具有不同影响水平的地点方面是有效的,但应在其他地方进行检查。目前的LTSBMI可用于农业生态相似的不同热带河流系统的生态系统健康评估和监测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a multimetric index for assessing the ecological integrity of some selected rivers and streams in the north-eastern part of Lake Tana sub-basin, Ethiopia
A multimetric index was developed using benthic macroinvertebrates to assess the ecological health of selected rivers and streams in the north-eastern part of Lake Tana subbasin, Ethiopia. One-time extensive sampling was carried out during the post-rainy season (November–December) of 2016. Macroinvertebrates were collected using a Surber sampler and a D-frame net at twenty sites. Based on the measured physico-chemical variables, sampling sites were clustered into references (n = 8) and test sites (n = 4). Approximately thirty potential candidate metrics were tested, and five metrics were selected as core metrics: number of Ephemeroptera Plecoptera Trichoptera taxa, percentage of Ephemeroptera individuals, percentage of EPT individuals, percentage that were shredders, and the percentage that were filter-feeders. These metrics were scored on a continuous scale from 0 to 10. To develop Lake Tana subbasin multimetric index (LTSBMI), scores were added and scaled to produce a score from 0 to 100. The final index was divided into five water quality classes: 'very good', 'good', 'fair', 'poor' and 'very poor'. The LTSBMI was effective in discriminating sites with different levels of impacts, but should be checked to other localities. The current LTSBMI could be used for ecosystem health assessment and monitoring in different Aftropical river systems with similar agroecology.
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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