Seasonal and Interannual Variations in the Frequency and Severity of Deformities in Larvae of Chironomus riparius (Meigen, 1804) and Prodiamesa olivacea (Meigen, 1818) (Diptera, Chironomidae) collected in a polluted site |
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Authors: | M. J. Servia F. Cobo M. A. González |
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Affiliation: | (1) Departamento Biologí a Animal, Facultad Biología, University of Santiago de Compostela, 15706 Santiago de Compostela, Spain |
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Abstract: | Larvae of Chironomus riparius and Prodiamesa olivacea were sampled at intervals overthe period November 1993 and October 1995 from theriver Sar in Galicia (N.W. Spain), with the aim ofinvestigating possible temporal variations in thefrequency of deformed individuals and in `Toxic Score'values (Lenat, 1993), a score for severity of theabnormalities calculated for each species. The resultsobtained indicate that, in both species, deformitiesare more frequent during the colder period of theyear. Similarly, Toxic Score values are higher duringthis period. These finding suggest that studies usingchironomid larvae as indicators of contaminationsshould involve sampling over an extended period, tominimize the influence of temporal variation. |
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Keywords: | biomonitoring Chironomidae Chironomus riparius deformities environmental stress Prodiamesa olivacea |
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