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Lethal Limits And Sublethal Effects Of Hypoxia On The Amphipod Gammarus Pseudolimnaeus, W. Wyatt Hoback, M. Christopher Barnhart

College of Natural and Applied Sciences

The amphipod Gammarus pseudolimnaeus is an important prey species for trout in certain tailwater fisheries below hydropower dams. The effects of low dissolved oxygen (DO) on this species were investigated in laboratory experiments. The duration of survival in anoxia and in lethally low DO concentrations differed among adult female, adult male, and juvenile individuals. Adult females were the group most sensitive to both anoxia and hypoxia; for example, LC50 in hypoxia was 2.00, 1.28, and 1.05 mg/L, respectively, for females, males and juveniles (48 h, 15°C). Juveniles were generally less sensitive to hypoxia but more sensitive to anoxia than were …