Managing the impacts of nutrient enrichment on river systems : dealing with complex uncertainties in risk analyses

Page, T. and Heathwaite, A. L. and Reynolds, C. and Beven, K. J. and Pope, L. and Willows, R. and Moss, Brian (2012) Managing the impacts of nutrient enrichment on river systems : dealing with complex uncertainties in risk analyses. Freshwater Biology, 57 (s1). pp. 108-123. ISSN 0046-5070

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1. Rivers and their catchments are complex, dynamic and non-equilibrium systems. Although the general functioning of these ecosystems is familiar, the characteristics of particular sites are often poorly known and accurate prediction of future behaviour to inform management decisions is extremely difficult. 2. Simple relationships between river nutrient concentrations and the health of river ecosystems do not exist. Natural variability and practical and technical constraints reduce our ability to set nutrient targets to protect river ecosystems. Particularly challenging is the use of simple doseresponse relationships as regulatory threshold targets, whereby sections of river are classified as either passing or failing to meet good ecological status. 3. Ecologically meaningful frameworks are needed that take account of the epistemic uncertainty associated with our predictions. Such frameworks should have clearly defined goals; be holistic; allow for natural variability; help to define ecologically acceptable environmental regimes; recognise that significant uncertainties mean that we will often be using indices rather than absolute measures; and use measures that explicitly include uncertainty estimates. Such approaches allow those outside the decision-making process to understand the level of environmental precaution included in the management of complex systems.

Item Type:
Journal Article
Journal or Publication Title:
Freshwater Biology
Uncontrolled Keywords:
?? threshold responsesenvironmental-managementstream periphytonfresh-waterecological statusagricultural catchmentsperiphyton biomasswater framework directivephosphorus transferriversnutrientsmultiple stressorswater-qualityeuropean lakesuncertaintyaquatic sci ??
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Deposited On:
27 Feb 2013 14:38
Last Modified:
15 Jul 2024 13:38