Impacts of pollution on freshwater communities in the border region between Russia and Norway. III. Results of the 1990-96 monitoring programme

acidification agua dulce contaminantes eau douce ecosistema ecosystems environmental impact assessment freshwater freshwater ecology freshwater fishes heavy metals limnologia limnologie limnology metales pesados monitoring noruega norway peces de agua dulce poisson d'eau douce polluant pollutants pollution de l'eau rsfsr russian federation sediment sedimento vigilancia water pollution