COHORT DYNAMICS OF A CAENIS LATIPENNIS POPULATION Cohort dynamics of an over- wintering Caenis latipennis population in Honey Creek, Oklahoma, U.S.A (original) (raw)

Eggs were collected from a south-central Oklahoma population of Caenis latipennis and reared at three different temperatures: 15, 20, and 25ºC. Eggs took 132 degree-days on average to hatch. Nymphs were reared to adults at 20ºC and emerged on average in 1709 degree-days. Degree-day estimates were applied to fall and winter stream temperatures to predict hatching and emergence times. These predictions indicate that the long overwintering generation is the combination of three different developmental strategies influenced by decreasing temperatures during the fall emergence period.