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 | | In the years 1982-1988, this stable state was interrupted, with a certain tendency towards alphamesosaprobia, despite the exceptional autopurification potential of the great river (average water flow about 6,000 m3). |
 | | Immediately below Rousse, however, the benthos fauna has been destroyed over a stretch of 4 km, while the zone of autopurification of the river (based on plankton studies) amounts to 15 km at a water temperature of 22-23°, 23 km at 16-19° and 31 km at 7-8°. |
 | | Pollution from the Arges, which carries the effluent of Bucharest to the Danube, results in a state of polysaprobia on the river, with a ten-fold decrease in the zoobenthos biomass. |
| www.worldwildlife.org /bsp/publications/europe/bulgaria/bulgaria8.html (8071 words) |
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