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Assessment of sources of uncertainty in macrophyte surveys and the consequences for river classification
Authors:Ryszard Staniszewski  Krzysztof Szoszkiewicz  Janina Zbierska  Jacek Lesny  Szymon Jusik  Ralph T Clarke
Institution:(1) Department of Ecology and Environment Protection, August Cieszkowski Agricultural University, Piatkowska 94C, 61-691 Poznan, Poland;(2) Department of Agrometeorology, August Cieszkowski Agricultural University, Piatkowska 94B, 61-691 Poznan, Poland;(3) Centre for Ecology and Hydrology, Winfrith Technology Centre, DT2 8ZD Dorchester, Dorset, England
Abstract:The application of macrophytes in freshwater monitoring is still relatively limited and studies on their intercalibration and sources of variation are required. Therefore, the aim of the study was to compare selected indices and metrics based on macrophytes and to quantify their variability. During the STAR project, several aspects influencing uncertainty in estimation of the ecological quality of river were assessed. Results showed that several metrics based on the indicative value of plant species can be used in evaluation of the ecological status of rivers. Among estimated sources of variance in metric values the inter-surveyor differences had the lowest effect and slightly stronger were the influences of temporal variation (years and seasons) and shading. The impact of habitat modification was the most important factor. Analysis showed that some of macrophyte-based metrics (notably MTR and IBMR) are of sufficient precision in terms of sampling uncertainty, that they could be useful for estimating the ecological status of rivers in accordance with the aims of the Water Framework Directive.
Keywords:macrophytes  Mean Trophic Rank  aquatic vegetation  error assessment  biodiversity  river classification
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