Abstract:
:Multispecies stream microcosms were used to test the toxicity of the pyrethroid fenvalerate (FV) associated with suspended particles in order to simulate a typical runoff exposure scenario. Stream microcosms were exposed for 1 h in triplicate to 0.0, 13.6, 136, or 1,365 microg/kg FV and effects were monitored for 93 d. Experimental design allowed for detection of interspecific effects on the emergence and thus survival of the caddisfly species Limnephilus lunatus Curtis and of intraspecific effects on the spatial distribution of adult and juvenile Gammarus pulex L. (Amphipoda). Exposure at 136- and 1,365 microg/kg resulted in a significant acute increase in drift. Survival of L. lunatus was significantly reduced in the 1,365-microg/kg treatment during single-species exposures. When other species were present, survival of L. lunatus was significantly reduced at 136 microg/kg. A similar increase in test system susceptibility was observed in relation to the spatial distribution of G. pulex. Juvenile individuals avoided areas with high numbers of adult amphipods, which may prey on the juveniles. This avoidance was significant in the control and the 13.6-microg/kg treatment but did not occur at higher levels of exposure. This study highlights the ecotoxicological importance of field-relevant levels of particle-associated hydrophobic chemicals that transiently increase during runoff events. Interspecific and intraspecific interactions can alter the test results; i.e., significant lethal and sublethal effects are measurable at FV levels approximately an order of magnitude lower than when biological interactions are excluded.
journal_name
Environ Toxicol Chemjournal_title
Environmental toxicology and chemistryauthors
Schulz R,Liess Mdoi
10.1897/1551-5028(2001)020<0757:rswpbf>2.0.co;2subject
Has Abstractpub_date
2001-04-01 00:00:00pages
757-62issue
4eissn
0730-7268issn
1552-8618journal_volume
20pub_type
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