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fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Byrne, PA; Reid, I; Wood, PJ
Publisher: Royal Society of Chemistry
Languages: English
Types: Article
Subjects: GE
Contamination of aquatic environments as a consequence of metal mining is an international issue. Most\ud historic studies have considered the impact of acid mine drainage (pH < 6) on instream communities and\ud comparatively little attention has been given to sites where drainage is typically circum-neutral (6 > pH < 8).\ud Here, the impacts of historic mining activities on the benthic macroinvertebrate community of a circumneutral\ud river in Central Wales are assessed. Biotic and diversity indices, widely used for biomonitoring\ud purposes, indicate aquatic macroinvertebrate assemblages within the Afon Twymyn to be in a good\ud condition, despite severe metal contamination of bed sediments and river water. However, Canonical\ud Correspondence Analysis identifies differences in community structure between mining impacted and\ud unimpacted reaches of the river associated with chalcophile (Zn, Pb, Cu, Cd) and common (Fe and Mn)\ud metals. Stream pH was not a significant factor structuring the macroinvertebrate community. Widely\ud utilised macroinvertebrate indices failed to identify impacts at the community level because they either\ud seek to identify impacts of a specific contaminant or are dependent on a model community response to\ud a given stress. The nature of metal mine discharges is temporally complex, having highly variable\ud chemical signatures and as a result, care is advised when interpreting and modelling community\ud impacts. The use of standard macroinvertebrate biotic and diversity indices in the context of the EU\ud Water Framework Directive could lead to erroneous classifications of aquatic ecosystem health when\ud used for bio-monitoring rivers affected by neutral mine drainage where other indicators are unavailable.
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