Responses of Hyalella azteca and Chironomus tentans to particle-size distribution and organic matter content of formulated and natural freshwater sediments
- Univ. of Mississippi, University, MS (United States). Dept. of Biology
The freshwater amphipod, Hyalella azteca (Saussure), and midge, Chironomus tentans (Fabricius), were exposed to formulated sediments and nontoxic field-collected sediments for 10 d to determine their responses to varying sediment particle sizes and organic matter content of freshwater sediments. In experiments with formulated sediments, H. azteca survival was >80% when exposed for 10 d to all particle-size regimes examined. Subsequent exposures of H. azteca to field-collected sediments resulted in >80% H. azteca survival in all sediments. Field-collected sediments with organic matter content ranging from 0.12 to 7.8% yielded no observed effects on amphipod survival, which ranged from 84 to 100%. Survival of C. tentans ranged from 4 to 56% when exposed to formulated sediments for 10 d with 0% particulate organic matter content. A threshold organic matter content between 0.76 and 0.91% was observed for C. tentans exposed to formulated and field-collected sediments. Chironomus tentans survival was >80% in all cases when exposed to various particle-size regimes in formulated sediments containing 2.5% particulate organic matter. Formulated sediments were suitable for determining H. azteca and C. tentans responses to particle-size regimes and organic matter content of sediments, as test results using formulated and natural sediments were in agreement. Except for C. tentans observed intolerance of <0.76 to 0.91% organic matter content of sediments, C. tentans and H. azteca are suitable benthic toxicity testing organisms for determining the potential toxicity of sediments with a wide range of particle-size regimes and organic matter content.
- OSTI ID:
- 6811389
- Journal Information:
- Environmental Toxicology and Chemistry; (United States), Vol. 13:10; ISSN 0730-7268
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CRUSTACEANS
SENSITIVITY
FLIES
FRESH WATER
WATER POLLUTION
ORGANIC COMPOUNDS
TOXICITY
SEDIMENTS
CONTAMINATION
BIOLOGICAL INDICATORS
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
DIPTERA
HYDROGEN COMPOUNDS
INSECTS
INVERTEBRATES
OXYGEN COMPOUNDS
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