Physiological tolerance ranges of larval Caenis latipennis (Ephemeroptera : Caenidae) in response to fluctuations in dissolved oxygen concentration, pH and temperature
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Laboratory experiments were conducted to investigate the physiological tolerance ranges of the mayfly Caenis latipennis (Ephemeroptera: Caenidae) from Tanyard Branch Creek in Walker County, Texas in response to stepwise fluctuations in dissolved oxygen concentrations, temperature and pH. Survivorship decreased slightly at a dissolved oxygen concentration of 7.0 mg/L, while trial groups suffered a dramatic decrease in survivorship at a dissolved oxygen concentration of 4.5 mg/L. Mean CTMax (Critical Thermal Maximum) for 10 individuals was 37.8C with a range from 36.7C to 38.5C. Mean critical lower pH for three trials of 10 individuals was 2.56 and mean critical upper pH for three trials of 10 individuals was 12.5.
author list (cited authors)
Puckett, R. T., & Cook, J. L.