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Life history of Caenis lubrica Tong and Dudgeon, 2002 (Ephemeroptera: Caenidae) in a Three Gorges Reservoir feeder stream, subtropical Central China

Abstract Life history of Caenis lubrica Tong and Dudgeon, 2002 (Ephemeroptera: Caenidae) was studied for the first time. We investigated it in Pangxie Stream, which feeds into the Xiangxi River Bay, Three Gorges Reservoir in subtropical Central China. Monthly samples of larvae were taken from January to December, 2017. Caenis lubrica was determined to exhibit trivoltinism in this system, having an overwintering generation and two summer generations. The cohort production interval (CPI) of the overwintering generation was six months, from November to April, and the CPIs of the two summer generations were one month each, from June to July and from July to August. The Accumulated Degree Days of C. lubrica for larval development of the overwintering generation and the two summer generations were estimated to be 1829.24 °C, 904.84 °C, and 859.83 °C, respectively.