Seasonal variation in water quality, plankton diversity and microbial load of tropical freshwater lakes in Nigeria

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
Ihuoma N. Anyanwu, Confidence A Ezema, Sowechi Ebi, C. Nwajiuba, O. Nworie, C. Anorue
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引用次数: 6

Abstract

Seasonal changes significantly affect tropical ecosystems; hence, verification of how these changes affect water quality is important for waterbodies that serve as water and food sources, particular as such changes are often associated with shifts in plankton diversity and microbial loads. This study assessed the seasonal changes in water quality, plankton diversity and microbial load in four lakes serving as sources of drinking water. Temperature, hardness and phosphate concentration were elevated in the dry season, and pH, biochemical oxygen demand, transparency, turbidity, total dissolved solids, conductivity, alkalinity and nitrate concentrations were elevated in the wet season. A phytoplankton analysis revealed that Chlorophyta, Bacillariophyta, Cyanophyta and Dinophyta were most common, with the families Desmidiaceae, Microcystaceae and Euglenaceae (phylum Euglenophyta) displaying dominance. For zooplankton, Rotifera was most common, with Branchionidae dominating the lakes in both seasons. In the wet season, Chlorophyta, Cyanophyta, Bacillariophyta and Dinophyta dominated, with Aphanizomenonaceae and Microcystaceae the most diverse families. Disease-causing pathogens, Ascaridae, Trichuridae and Ancylostomatidae (phylum Nematoda), were detected during periods of high rainfall. The waters in the dry season had higher microbial loads than in the wet season, ranging from 1.50 to 233.50 CFU g−1 (p < 0.05). This demonstrates the seasonal variations in risk to users and underlies the importance of regular assessment of water quality particularly given the threat of seasonal changes elated to climate change.
尼日利亚热带淡水湖水质、浮游生物多样性和微生物负荷的季节变化
季节变化严重影响热带生态系统;因此,验证这些变化如何影响水质对于作为水源和食物来源的水体来说很重要,尤其是因为这些变化通常与浮游生物多样性和微生物负荷的变化有关。本研究评估了四个饮用水源湖泊的水质、浮游生物多样性和微生物负荷的季节变化。旱季温度、硬度和磷酸盐浓度升高,雨季pH、生化需氧量、透明度、浊度、总溶解固体、电导率、碱度和硝酸盐浓度升高。浮游植物分析表明,绿藻门、硅藻门、蓝藻门和恐龙门最为常见,其中藻科、微囊藻科和裸藻科(裸藻门)占优势。对于浮游动物来说,轮虫是最常见的,在这两个季节,鳃科都在湖泊中占主导地位。丰水期以绿藻门、蓝藻门、硅藻门和恐龙门为主,其中以Aphanicomenaceae和Microystaceae科最为多样。在高降雨量期间检测到致病病原体,如蛔虫科、鞭虫科和钩虫科(线虫门)。旱季水域的微生物负荷高于雨季,范围为1.50至233.50 CFU g−1(p<0.05)。这表明了用户风险的季节变化,也说明了定期评估水质的重要性,特别是考虑到气候变化带来的季节变化威胁。
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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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