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- Title
Metallothionein Induction as Indicator of Low Level Metal Exposure to Aquatic Macroinvertebrates from a Relatively Unimpacted River System in South Africa.
- Authors
Kemp, M.; Wepener, V.; Kock, K.; Wolmarans, C.
- Abstract
The Marico River is relatively unaffected by anthropogenic activities. However, metal concentrations-mainly from natural sources-occasionally exceed environmental quality guidelines. Macroinvertebrates are capable to react to these metals through processes such as the induction of metallothioneins (MTs). The aims of this study were to determine whether the induction of MTs can be used as indicator of natural metal exposure in not anthropogenically impacted systems and whether there are relationships between metal concentrations in water, sediment and macroinvertebrates and concomitant MT levels. Positive correlations were found between metals in sediment and macroinvertebrates, while there were no correlations between metal concentrations in water and macroinvertebrates. Even in a not anthropogenically impacted system, a positive correlation existed between trace metal bioaccumulation (e.g. Ni, Pb, Zn) in macroinvertebrates and the induction of MTs. There were, however, no correlations between MTs and bioaccumulation of earth metals (e.g. Al, Fe, Mn, Ti).
- Subjects
MARICO River (South Africa &; Botswana); INVERTEBRATES; ANTHROPOGENIC effects on nature; ENVIRONMENTAL quality; METALLOTHIONEIN; METALS &; the environment; BIOACCUMULATION
- Publication
Bulletin of Environmental Contamination & Toxicology, 2017, Vol 99, Issue 6, p662
- ISSN
0007-4861
- Publication type
Article
- DOI
10.1007/s00128-017-2201-8