Two different approaches to define the ecological status of several catchments (NW Portugal) are compared. At a coarser scale, all the stream network was classed using GIS according to several variables related to: a) biotic indicators, such as native and exotic fish species, benthic biotic index and characteristics of the riparian corridor); b) chemical indicators of contamination, where an estimation of industrial and urban organic loads and water quality was included. This methodology is preceded by a typological classification so that a determination of the ecological status can be made separately of each of the physical units integrated in the watercourse.
Cortes R., Oliveira S., Cabral D., Santos S. & Ferreira M.T
Archives für Hydrobiology, 13, 209-224.
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