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- W3179519970 endingPage "67" @default.
- W3179519970 startingPage "33" @default.
- W3179519970 abstract "The growth and development of organisms in aquatic ecosystem are affected by the presence of oxyanions which are toxic even at low concentrations. The presence of undesirable types of oxyanions at levels above stipulated threshold concentrations, cause ecological imbalance and the ultimate destruction of the ecosystem. This chapter is focused on the ecological impact of oxyanions in aquatic system. Aside their bioaccumulation in the living organism, their direct impacts include significant reduction in the water quality, alteration of water pH value, which may be intolerable to plants and animals and reduction in the abundance and fitness of biota. Although some oxyanions, such as selenium, nitrogen and phosphorus, are required as nutrients in biological systems, they become toxic with increasing concentrations. Their toxicity is associated with their ability to substitute some important oxyanions in biological systems due to their structural similarities, their oxidation state, mobility and the pH value of the medium in which they occur. However, the oxyanions of arsenic, chromium and selenium are harmful because of their nonbiodegradability, higher solubility in water and deleterious effects. The oxyanions of nitrogen and phosphorus are associated with excessive growth of algae and macrophytes, with the attendant effects on the structure and functioning of the aquatic system. This study posits that the dearth of organisms (due to the toxicity of oxyanions) or their abundance (due to nutrient enrichment by oxyanions) impact negatively on the food web and stability of the ecosystem." @default.
- W3179519970 created "2021-07-19" @default.
- W3179519970 creator A5023880483 @default.
- W3179519970 creator A5072974461 @default.
- W3179519970 date "2021-01-01" @default.
- W3179519970 modified "2023-10-14" @default.
- W3179519970 title "Ecological Impacts of Oxyanion in Aqua Systems" @default.
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