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Report on Harmonisation of freshwater biological methods

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Acidificati<strong>on</strong> Index, based <strong>on</strong> the sensitivity <strong>of</strong> the various taxa, is used to assess theeffects <strong>of</strong> acidificati<strong>on</strong>. The classificati<strong>on</strong> system is modified to cover acidificati<strong>on</strong> <strong>of</strong>organic rivers. In eutrophicati<strong>on</strong> studies, different indices such as the Modified TrentIndex, BMWP, ASTP, Shann<strong>on</strong>-Weaver are used.69. Knowledge <strong>on</strong> Norwegian river macroinvertebrates is based <strong>on</strong> nati<strong>on</strong>alm<strong>on</strong>itoring programs <strong>on</strong> acidificati<strong>on</strong> and liming (22 rivers including <strong>on</strong>ly n<strong>on</strong>-limedsites) and various surveys related to effects <strong>of</strong> local polluti<strong>on</strong> and river regulati<strong>on</strong>s(approx. 900 sites).Poland70. The BMWP system provides a score for each macroinvertebrate family that isprimarily dependant <strong>on</strong> its sensitivity to organic polluti<strong>on</strong>. In use in the UnitedKingdom since the late 1970s, this method is intended to be applied in Poland,operating with a modified list <strong>of</strong> indicator taxa. It is recently elaborated and will so<strong>on</strong>be utilised within a pilot project. To verify the results obtained by calculating theBMWP score, a diversity index expressed as the ratio <strong>of</strong> number <strong>of</strong> families tomacroinvertebrate fauna abundance is determined.Portugal71. For WFD-compliant m<strong>on</strong>itoring the BMWP' will be used which is an adaptati<strong>on</strong> <strong>of</strong>the British Biological M<strong>on</strong>itoring Working Party (BMWP) score system. Themodificati<strong>on</strong>s include the additi<strong>on</strong> <strong>of</strong> new families, changes in some scores anddivisi<strong>on</strong> <strong>of</strong> scores into five classes, representing various degrees <strong>of</strong> organic polluti<strong>on</strong>.Romania72. M<strong>on</strong>itoring <strong>of</strong> aquatic biota throughout Romania is c<strong>on</strong>ducted four times per yearwithin the framework <strong>of</strong> the Nati<strong>on</strong>al Water M<strong>on</strong>itoring System, which started in1978. In the past, <strong>biological</strong> quality assessment was based <strong>on</strong> the Relative LoadMethod (Knöpp, 1955). Now, <strong>biological</strong> quality assessment <strong>of</strong> running waters is based<strong>on</strong> the determinati<strong>on</strong> <strong>of</strong> the Saprobic Index according to Pantle and Buck (1955).Since the beginning <strong>of</strong> 2004 the index scores have been classified in a five-bandscheme following the recommendati<strong>on</strong>s <strong>of</strong> Knoben et al. (1999).82

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