Variables: concentration Keywords: stream pyrethroids Substances: Bifenthrin (OXCDWLBJSLVWHB-LKRLXIKPSA-N) Allethrin (ZCVAOQKBXKSDMS-UHFFFAOYSA-N) Cyfluthrin (OFHFONYRMVKULH-WNYJFNBPSA-N) Chlorpyrifos-methyl (HRBKVYFZANMGRE-UHFFFAOYSA-N)