Optimization of in situ bioassays with Hyalella azteca and Chironomus tentans

Uncertainty is always associated with extrapolations of laboratory toxicity test responsesto in situ conditions. Exposing toxicity test organisms in situ reduces uncertainty by removing sampling related artifacts and better simulating natural exposures. The amphipod Hyalella azteca and the midge Chi...

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Bibliographic Details
Published in:Environmental toxicology and chemistry 1997-03, Vol.16 (3), p.559-564
Main Authors: Chappie, Daniel J., Burton Jr, G. Allen
Format: Article
Language:English
Subjects:
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chironomidae
Chironomus tentans
Ecotoxicology, biological effects of pollution
Effects of pollution and side effects of pesticides on protozoa and invertebrates
Freshwater
Fundamental and applied biological sciences. Psychology
Hyalella azteca
In situ bioassay
Toxicity
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Summary:Uncertainty is always associated with extrapolations of laboratory toxicity test responsesto in situ conditions. Exposing toxicity test organisms in situ reduces uncertainty by removing sampling related artifacts and better simulating natural exposures. The amphipod Hyalella azteca and the midge Chironomus tentans, were enclosed in plastic containers with 149‐ or 74‐mm mesh openings. These chambers were anchored to stream substrates allowing continual water exchange and contact with sediments. Hyallela azteca survival was greater than 80% after 4 weeks of exposure. In situ testing with H. azteca in cold water (
ISSN:0730-7268
1552-8618
DOI:10.1002/etc.5620160323