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Distribution of aquatic Oligochaeta in the Finnish Lake District
Author(s) -
SÄRKKÄ JUKKA,
AHO JORMA
Publication year - 1980
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1980.tb01194.x
Subject(s) - tubifex , eutrophication , oligochaeta (plant) , tubifex tubifex , epilimnion , ecology , sewage , environmental science , biology , invertebrate , nutrient , environmental engineering , hypolimnion
SUMMARY. The distribution of oligochaetes was examined at sampling stations grouped into three types: (1), in eutrophic and dystrophic areas or in areas polluted by pulp‐mill wastewaters; (2), slightly eutrophic stations; (3), ‘clean’ stations unaffected by sewage or other inputs. Limnodrilus hoffmeisteri and Potamothrix hammoniensis were practically the only species in group 1, and the same species accounted for two thirds of the total numbers in group 2, although Peloscolex ferox and some other species also occurred. At the cleanest stations the dominating species were P. ferox, Psammoryctides barbatus, Stylodrilus heringianus and Tubifex tubifex . A factor analysis showed that L. hoffmeisteri and P. hammoniensis were associated with increased nutrients and water colour in the lower part of the epilimnion. In the metalimnion the relationship of S. heringianus and P. ferox to water colour and total nitrogen differed from that of L. hoffmeisteri and P. hammoniensis . Winter oxygen content was important for S. heringianus .