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Effect of indigenous animals on chronic end points in freshwater sediment toxicity tests
Author(s) -
Reynoldson T.B.,
Day K.E.,
Clarke C.,
Milani D.
Publication year - 1994
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.5620130616
Subject(s) - tubifex tubifex , hyalella azteca , chironomus riparius , tubifex , benthic zone , biology , chironomus , invertebrate , ecology , chronic toxicity , sediment , chironomidae , toxicity , amphipoda , chemistry , larva , crustacean , organic chemistry , paleontology
Sediment toxicity tests were conducted using three species of benthic invertebrates, Chironomus riparius, Hyalella azteca , and Hexagenia limbata , with various densities of the oligochaete worm Tubifex tubifex . It was shown that indigenous animals, simulated by the presence of Tubifex tubifex , did not affect survival of the test species ( P ≥ 0.05) but did reduce growth in all three test species and in two species at the lowest tested densities, equivalent to 1,460 worms per square meter. At densities of Tubifex tubifex equivalent to 20,000 m −2 , the growth of Chironomus riparius was reduced by >90%, Hyalella azteca by >60%, and Hexagenia limbata by almost 50%. The densities of oligochaetes are equivalent to those found in many contaminated sites. Therefore, it is concluded that the presence of indigenous organisms can confound the interpretation of toxicity test results, based on chronic end points. It is recommended that removal of organisms be considered before toxicity tests are conducted with freshwater sediments from sites with large populations of benthic invertebrates, especially oligochaete worms.