| diversity and structure of chironomidae (diptera) communities along a gradient of heavy metal contamination in a subarctic watercourse. | community structure of chironomid larvae was investigated along a gradient of heavy metal pollution in the subarctic lakes of the pasvik watercourse, bordering northern norway and russia. sixty taxa were present in the four investigated lakes. species richness was lower in lake kuetsjarvi, nearest the main source of pollution, relative to the more distant lakes, and simpson's diversity index was similarly highest in the less polluted site with higher maximum depth. the number of orthoclad chiron ... | 2003 | 12711428 |