Search

Your search keyword '"Addo-Bediako, Abraham"' showing total 25 results
Start Over Author "Addo-Bediako, Abraham"
25 results on '"Addo-Bediako, Abraham"'

4. Effects of trace elements on benthic macroinvertebrate distribution in the sediments of two rivers in the Olifants River Basin, South Africa.

Author

Addo-Bediako, Abraham

Subjects
*RIVER sediments, *WATERSHEDS, *TRACE elements, *ENVIRONMENTAL health, *AQUATIC organisms, *SEDIMENT sampling, *ANALYSIS of river sediments
Abstract

Many freshwater ecosystems are facing ecological challenges such as influx of trace elements from human activities, and sediments behave as a sink for trace elements in these environments. Trace element contamination in river sediments is a major environmental concern due to its devastating effect on benthic organisms. The aim of this study was to assess the effect of trace elements in sediments on the distribution of benthic macroinvertebrates in the Blyde and Mohlapitsi rivers of the Olifants River Basin, South Africa. Sediment samples and benthic macroinvertebrates were collected from six sites along each river. The results showed variations in the concentration of the trace elements in the sediment and the distribution of benthic macroinvertebrates among the different sites and between the two rivers. Both rivers recorded high taxa richness and sensitive taxa were well represented in most parts of the rivers, an indication that the rivers are not highly disturbed. There were insignificant correlations between most of the trace elements and the abundance of the benthic macroinvertebrates, though some taxa showed significant correlations with the trace elements. Despite the low impact of the trace elements on the distribution and diversity of benthic macroinvertebrates, ecological health of the rivers and structural distribution of macroinvertebrates may be affected in the future due to increasing human activities in the catchments. It is therefore recommended that effluents from human activities should be controlled to prevent a further degradation of the rivers to protect macroinvertebrates and other aquatic biota. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

18. Persistent organic pollutants in the Olifants River Basin, South Africa: Bioaccumulation and trophic transfer through a subtropical aquatic food web

Author

Verhaert, Vera, primary, Newmark, Nadine, additional, D'Hollander, Wendy, additional, Covaci, Adrian, additional, Vlok, Wynand, additional, Wepener, Victor, additional, Addo-Bediako, Abraham, additional, Jooste, Antoinette, additional, Teuchies, Johannes, additional, Blust, Ronny, additional, and Bervoets, Lieven, additional

Published
2017
Full Text
View/download PDF

25. Are catfish from metal-polluted impoundments in the Olifants River, South Africa, safe for human consumption?

Author

M Marr, Sean, Jooste, Antoinette, Addo-Bediako, Abraham, and J Luus-Powell, Wilmien

Abstract

AbstractMany impoverished rural communities rely on fish from inland waters for dietary protein; however, inland waters are becoming increasingly contaminated due to anthropogenic activities. The Olifants River is one of the most polluted river in South Africa. The upper catchment is characterized by acid mine drainage and elevated levels of contaminants from domestic, agricultural, industrial, and mining effluents. A human health risk assessment was conducted to determine whether 2 catfish species from 2 impoundments in the Olifants River were safe for human consumption. The concentrations of metal in the fish muscle were in most cases higher at Lake Flag Boshielo than at the downstream Phalaborwa Barrage. Consumption of catfish from Lake Flag Boshielo on a weekly basis could result in adverse health impacts from antimony, chromium, cobalt, and lead. For the Phalaborwa Barrage, only lead would be likely to pose a health risk for consumption of catfish at weekly frequency.

Published
2015
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results