Abstract
Every important process in population ecology ultimately influences either fecundity or survival, so reliable methods for estimating birth and death rates in the field are key to understanding what features of the environment regulate population dynamics. In 1960 W. T. Edmondson, after visiting the Istituto Italiano de Idrobiologia in Pallanza while on sabbatical leave from the University of Washington, published a remarkably simple method for estimating zooplankton instantaneous birth rate, b, based on females’ mean clutch size and egg development time as a function of temperature (Edmondson 1960). He further pointed out that, taken together with population instantaneous rate of change, r, calculated from the population sizes on consecutive dates, instantaneous death rate could be calculated as d = r − b.
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