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Title: The feasibility of biomanipulation in reservoirs and deeper lakes : draft final report
Author: D.M. Harper
Author: N. Pacini
Author: R. Sanderson
Document Type: Monograph
Annotation: EA additional title info: the feasibility of biomanipulation in reservoirs and deeper lakes
Over the past fifty years there has been a progressive decay in aquatic habitats as a consequence of human disturbance. Investigations since the 1940s, in Europe and the US, have identified nutrient, particularly phosphorus, enrichment, primarily from sewage effluent and secondarily from agriculture, as the cause. This was well understood by the late 1970s. Since that time the scientific community has progressively become more active in seeking management solutions as well as mere explanations for change. A series of management oriented publications have reflected that stage of knowledge and the background is not considered further here. In the last 5 to 10 years it has become clear that, despite long term research efforts, the reduction of phosphorus alone has not achieved the desired restoration of aquatic ecosystems. The Norfolk Broads are a good example of this problem. This stems from the realisation that the OECD models for eutrophication assessment, which assume strong and direct dependence from a single identifiable element, i.e. phosphorus, and which were powerful tools for the initial classification of waterbodies, have failed as predictive tools for explaining changes in single ecosystems. An international investigation project devoted to the assessment of eutrophication management by nutrient reduction conclusively disproved the expectations built upon single nutrient loading relationships. The development of ecotechnological management, a pragmatic, biologically based approach to the integration of physical, chemical and biological changes in the structure of an ecosystem, is now leading to water quality improvement using internal mechanisms which support the external mechanisms.
Publisher: National Rivers Authority
Publication Date: 1995
Publication Place: Bristol
Subject Keywords: PhosphorusAgricultural pollutionEffluentsWater pollutionEutrophicationLakesFood chainsWater reservoirs
Geographic Keywords: RutlandLeicestershire
Extent: 108
Total file downloads: 286

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