Abstract
We gathered water and macrobenthic data over a 5-year period in the Valli di Comacchio, the largest lagoons in the Po River Delta (northern Adriatic), to evaluate the response of ecological indices and to test their sensitivity against environmental variables. Of 84 sampling points, only 12 exhibited a good/high ecological quality status according to the BITS and 28 according to the M-AMBI. Environmental variables representative of eutrophication did not correlate with the indices. The impacts experienced by the Valli during the last 30 years seem to have led to disruption of the pelagic–benthic food web. Eel fisheries, whose management is traditionally characterised by long water residence time, thus seem inconsistent with restoration purposes.
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