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ISSN : 2287-8327
Building capacity for ecological assessment using diatoms in UK rivers
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Abstract
Diatoms have become an integral part of the UK’s freshwater monitoring strategy over the past two decades, mostly in response to increasingly stringent European Union (EU) legislation. The use of diatoms is based on strong correlations between diatom assemblages and environmental variables, and from knowledge of the “expected” (= “reference”) state of each river. The nationwide overview of the ecological health of rivers this gives allows those stretches of rivers which fail to meet EU criteria to be identified. This, in turn, allows appropriate remediation measures to be planned. Because diatom assemblages vary in space and time, even within a single water body, effective use of diatoms requires a consistent approach in order to minimise uncertainty. This includes the use of methods which comply with European Standards,a training and accreditation scheme for analysts, and a suite of quality assurance methods. Those aspects of uncertainty that cannot be readily controlled have been quantified and all estimates of ecological status are accompanied by the appropriate “confidence of class” and “risk of misclassification”. This, in turn, helps planners prioritise those locations which are most likely to benefit from remediation.
- keywords
- diatoms, monitoring, rivers, eutrophication, quality assurance
Reference
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