Abstract
Abstract Survival of aquatic insects was compared before and after exposure to methoxychlor treatment (0.3 mg·L−1 for 15 min) of the Saskatchewan River system at three sites downstream from injection (21, 38, and 107 km). Species studied were Isoperla bilineata (Say), Isoperla longiseta Banks (Plecoptera: Perlodidae), Hydropsyche alternans (Walker), Hydropsyche occidentalis Banks (Trichoptera: Hydropsychidae), Stenonema termination (Walsh), and Stenacron interpunctatum (Say) (Ephemeroptera: Heptageniidae). Survival of individuals exposed to treatment was species-dependent and related to distance from the methoxychlor injection point. At the km 21 site, survival of four of the six species studied declined significantly (P < 0.05) over 15 days, relative to controls. At the km 38 and 107 sites, survival was not affected significantly (P > 0.05) for any species studied.
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