Considerations for environmental biogeochemistry and food security for aquaculture around Lake Victoria, Kenya.

Autor: Marriott AL; Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK. anma@bgs.ac.uk., Osano OF; School of Environmental Sciences, University of Eldoret, Eldoret, Kenya., Coffey TJ; School of Veterinary Medicine and Science, University of Nottingham, Nottingham, UK., Humphrey OS; Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Ongore CO; Kenyan Marine Fisheries Research Institution (KMFRI), Kisumu, Kenya.; Pelagic Ecology Research Group Scottish Oceans Institute, Gatty Marine Laboratory, University of St Andrews, East Sands St Andrews, Scotland, UK., Watts MJ; Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Keyworth, Nottingham, NG12 5GG, UK., Aura CM; Kenyan Marine Fisheries Research Institution (KMFRI), Kisumu, Kenya.
Jazyk: angličtina
Zdroj: Environmental geochemistry and health [Environ Geochem Health] 2023 Aug; Vol. 45 (8), pp. 6137-6162. Date of Electronic Publication: 2023 Jun 02.
DOI: 10.1007/s10653-023-01585-w
Abstrakt: The impact of population expansion through economic growth and development has been identified as one of the key drivers of both water and sediment contamination from potentially harmful elements (PHEs). This presents a major hazard not only to aquatic ecosystems but local riparian communities and beyond who rely heavily on this natural resource for drinking water and fish-a valuable source of dietary micronutrients and protein. The present study measured biogeochemical concentration of PHEs in water, sediment and fish from locations pooled into four zones within Winam Gulf and Lake Victoria area of Kenya. Captured fish were used as a sentinel receptor of lake health to evaluate potential risks to fisheries and aquaculture food security. In water, concentrations of arsenic (As), cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) were observed above the United States Environmental Protection Agency (US EPA) maximum contamination level drinking water guidelines (MCL), with aluminium (Al) observed above the Aquatic Life Criteria in all four zones. Similarly, sediment concentrations in all four zones exceeded the US EPA Effects range low (ERL) threshold guidelines for Cu, nickel (Ni), zinc (Zn) and Pb, with Cu, Zn and Pb classed at moderate contamination levels using the contamination factor. Fish tissue concentrations from the four zones were calculated using recommended daily intakes (RDI) and for PHEs as provisional maximum tolerable intakes (PMTIs) and indicated most macro- and micronutrients were at or below 10% RDI from aquaculture and wild fish, with Se indicating a greater RDI (16-29%) in all the zones. Contributions of PHEs to PMTIs were below threshold guidelines for both aquaculture and wild fish with only Cd, Cr and Pb levels being above the PMTI thresholds. There is a need to assess the long-term effects of persistent anthropogenic PHE input into Winam Gulf and the wider Lake Victoria basin. Continued monitoring of PHEs using both historical and more recent data will enable future management policies to be implemented through improved mitigation strategies to reduce their impact on water quality, fish health and subsequent human health.
(© 2023. Crown.)
Databáze: MEDLINE
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