Short-term recovery of macroinvertebrate communities following a flash flood in an urban river: a case study of the Palmiet River in Durban, South Africa

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY African Journal of Aquatic Science Pub Date : 2021-04-28 DOI:10.2989/16085914.2021.1894085
N. Khumalo, S. Mdluli, J. Lebepe
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引用次数: 2

Abstract

Extreme floods have become frequent in the urban Palmiet River due to exacerbating climate change. Therefore, the current study aimed to explore a short-term recovery of macroinvertebrate communities following a flash flood in the Palmiet River, KwaZulu-Natal, South Africa. Different biotopes, i.e. stones, gravel sand and mud, and vegetation were sampled after the March-April heavy rain in 2018. Ephemeroptera, Odonatan, and Hemipteran have shown similar trends across weeks at all sites. Plecoptera and Coleoptera started recovering at week four However, the total abundance and taxa richness had significantly recovered during the fourth week at site 2 and 3, and fifth week at site 1. Communities have shown no significant difference for each site from weeks six to eight (ANOVA, p > 0.5), which implies that climax on macroinvertebrate communities was reached at week six. Hydrologic regime change has not influenced water quality parameters across all weeks (ANOVA, p > 0.5) and this was also reflected on the average score per taxon (ASPT), which has shown no significant difference (ANOVA, p > 0.5) across weeks at all sites. These findings provide a baseline for future studies on flood effect on urban streams and supplement the understanding of the effects of sudden hydrologic regime changes on macroinvertebrate communities.
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城市河流山洪暴发后大型无脊椎动物群落的短期恢复:以南非德班Palmiet河为例
由于气候变化加剧,城市棕榈河的极端洪水变得频繁。因此,本研究旨在探讨南非夸祖鲁-纳塔尔省Palmiet河暴发洪水后大型无脊椎动物群落的短期恢复。在2018年3 - 4月的暴雨后,对不同的生物群落,即石头、砾石、沙子和泥土以及植被进行了采样。在所有的地点,蜉蝣目、蜻蜓目和半翅龙在数周内都显示出类似的趋势。翅翅目和鞘翅目在第4周开始恢复,但总丰度和分类丰富度在第4周和第5周在第2、3和第5周显著恢复。从第6周到第8周,各地点的群落差异不显著(方差分析,p > 0.5),这表明大型无脊椎动物群落在第6周达到了顶极。水文制度变化在各周内没有影响水质参数(方差分析,p > 0.5),这也反映在每个分类单元的平均得分(ASPT)上,在所有站点的各周内没有显着差异(方差分析,p > 0.5)。这些发现为未来洪水对城市河流影响的研究提供了基础,并补充了对水文状况突然变化对大型无脊椎动物群落影响的理解。
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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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