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Water policy effectiveness: 30Years of change in the hypernutrified Colne estuary, England

McMellor, S and Underwood, GJC (2014) 'Water policy effectiveness: 30Years of change in the hypernutrified Colne estuary, England.' Marine Pollution Bulletin, 81 (1). pp. 200-209. ISSN 0025-326X

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Wastewater discharges and agricultural run-off have caused nutrient enrichment leading to eutrophication, in receiving waters worldwide. Analysis of a 30. year data set (1981-2010) for the Colne estuary, a hypernutrified estuary in the south-east of England, revealed significant reductions in nutrient concentrations in freshwater inputs and along the estuarine gradient linked to management actions. DIN concentrations decreased, mainly as a result of reduced ammonia outputs from Colchester STW and reduced nitrate loads from the catchment. Declines in phosphate concentrations occurred due to improved STW processes. There were significant declines in phytoplankton chlorophyll a over the period. Long-term trajectories of nutrient decreases were also strongly influenced by interannual patterns of rainfall and climatic signals (winter NAO). Standardised winter DIN concentrations in the Colne estuary significantly exceed the Water Framework Directive good status target, but the estuary shows no symptoms of eutrophication. © 2014 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Estuary; Eutrophication; Water Framework Directive; Nutrients; Water quality
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Life Sciences, School of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 29 Sep 2014 14:58
Last Modified: 15 Jan 2022 00:33

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