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Slow avoidance response to contaminated sediments elicits sublethal toxicity to benthic invertebrates
Daniel J Ward1, Stuart L Simpson, Dianne F Jolley
1Centre for Environmental Contaminants Research, CSIRO Land and Water, Lucas Heights, NSW 2234, Australia. djw64@uowmail.edu.au
Environmental Science & Technology
|May 3, 2013
Summary
Sediment contaminants harm aquatic invertebrates like Melita plumulosa and Nitocra spinipes, with exposure duration and frequency impacting survival and reproduction. Avoidance behaviors may not fully protect against sublethal effects.
Area of Science:
- Environmental toxicology
- Aquatic ecology
- Benthic invertebrate toxicology
Background:
- Sediment heterogeneity influences contaminant exposure for benthic organisms.
- Aquatic environments face risks from contaminated sediments.
- Understanding contaminant effects on key invertebrate species is crucial for ecological risk assessment.
Purpose of the Study:
- To assess acute and chronic toxicity of contaminated sediments on Melita plumulosa and Nitocra spinipes.
- To investigate the impact of exposure duration and frequency on invertebrate survival and reproduction.
- To compare laboratory sediment toxicity testing with potential field exposures.
Main Methods:
- Conducted 10-day bioassays using field-collected contaminated sediments.
- Exposed epi-benthic amphipod Melita plumulosa and harpacticoid copepod Nitocra spinipes.
- Varied exposure duration and frequency to assess toxicity thresholds.
Main Results:
- Increased exposure duration decreased survival for both species.
- Increased exposure frequency (>96-h) significantly increased toxicity for M. plumulosa.
- Reproduction was reduced in both species; sublethal effects occurred faster than avoidance behaviors in M. plumulosa.
Conclusions:
- Static, continuous sediment toxicity tests may overestimate field toxicity by preventing organism avoidance.
- Sublethal effects can occur even when acute lethality is avoided through behavioral responses.
- Contaminated sediments pose significant risks to benthic invertebrates, affecting survival and reproduction.
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