Intercalibration of assessment methods for macrophytes in lowland streams: direct comparison and analysis of common metrics |
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Authors: | Sebastian Birk Thomas Korte Daniel Hering |
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Institution: | 1. Department of Hydrobiology, University of Duisburg-Essen, Universit?tsstr. 5, D-45117, Essen, Germany
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Abstract: | The results of four macrophyte assessment methods (French Indice Biologique Macrophytique en Rivière, German Reference Index,
British Mean Trophic Rank and Dutch Macrophyte Score) were compared, based on plant survey data of medium-sized lowland streams
in Central Europe. To intercalibrate the good quality class boundaries two alternative methods were applied: direct comparison
and the use of “common metrics”. While the French and British methods were highly related (R2>0.75), the German RI showed less (0.20<R2<0.55) and the Dutch DMS least correlation (R2<0.10) with other methods. Of 70 macrophyte metrics tested only Ellenberg_N was considerably related to three of the national
assessment methods, thus representing a potential common metric for intercalibration. Comparison of quality class boundaries
via regression analysis using both intercalibration approaches revealed major differences between classifications of the French,
German and British methods, which are, in addition, related in a nonlinear way. |
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Keywords: | ecological quality classification STAR project EU Water Framework Directive macrophytes Mean Trophic Rank Indice Biologique Macrophytique en Rivière |
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