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Seasonal occurrence of microplastics in sediment of two South African recreational reservoirs

Water Biology and Security 2023年第3期2卷 12-18页

作者： Thendo Mutshekwa Linton F.Munyai Lutendo Mugwedi Ross N.Cuthbert Farai Dondofema tatenda dalu Aquatic Systems Research Group Department of Geography and Environmental SciencesUniversity of VendaThohoyandou0950South Africa School of Biology and Environmental Sciences University of MpumalangaNelspruit1200South Africa Institute for Global Food Security School of Biological SciencesQueen's University BelfastBT95DLBelfastNorthern IrelandUK South African Institute for Aquatic Biodiversity Makhanda6140South Africa Stellenbosch Institute for Advanced Study Wallenberg Research Centre at Stellenbosch UniversityStellenbosch7600South Africa

Inland water systems are regarded as a pathway and sink of plastic pollutants from the terrestrial *** ecosystems are globally contaminated with microplastics,but the spatiotemporal occurrence and density of microplastics in freshwater ecosystems remain poorly *** present study seasonally assessed differences in microplastic density in the sediments from two South African recreational reservoirs associated with low human activities(macadamia orchards)and high human activities(communal areas).Microplastics were recovered from all of the reservoirs assessed,indicating their extensive occurrence and *** numbers were significantly higher in reservoirs associated with high anthropogenic activities during the hot-dry season(140.6 particles kg^(-1)dwt)and lower in reservoirs associated with low anthropogenic activities during the hot-wet and cool-dry seasons,i.e.,22.60 particles kg^(-1)dwt and 16.13 particles kg^(-1)dwt,***,polypropylene(31%)and polystyrene(30%)were identified as the dominant types of microplastic polymer in both reservoir ***,no correlative relationships were observed for environmental parameters and microplastic densities across reservoirs and seasons,suggesting a widespread and largely context-independent pollution *** results show that microplastics are not evenly distributed between waters associated with low human activities and high human *** work should seek greater sample sizes and centre around observing microplastic contamination in the region by examining their sources,transport,and impacts to freshwater environments,whilst informing management strategies.

关键词： Emerging pollutant Plastic debris Contamination Microplastics Freshwater pollution

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