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Abstract
Following a spill of more than 94.4 m3 of unleaded gasoline into Wolf Lodge Creek in northern Idaho, impacted areas were mechanically agitated to release substrate-trapped hydrocarbons by dragging a bulldozer blade with a tightly wound chainlink fence attached to it backward over the substrate. Portions of two riffles were left unagitated to determine if differential recovery of benthic macroinvertebrates and periphyton in cleaned vs uncleaned areas of the stream would occur. Chlorophyll a concentrations and densities of most macroinvertebrates were significantly lower (P ⩽ 0.05) in raked areas 12 days after stream cleaning. However, macroinvertebrate and periphyton community compositions were very similar 1 month after stream cleaning and for the remainder of the study. In spite of similar recovery times of macroinvertebrates and periphyton in raked and nonraked areas, the cleaning process is viewed as beneficial because it minimized possible chronic effects on the biota without causing substantial additional impact.
Published Version
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