Evaluation of the Intrinsic Rate of Increase as an Endpoint for <i>Ceriodaphnia</i> Chronic Tests
TL;DRAbstract
Fecundity and survival data can be used to calculate a number of demographic measures which characterize populations including net replacement rate, generation length, life xpectancy, and reproductive value. Another measure is r, lternately called the intrinsic or instantaneous rate of population increase. This statistic is a measure of the capacity of a population to increase in an unlimited environment and is in estimate of ecological growth potential. The equation of Lotka (1925) for calculating the intrinsic rate of increase is 1=∑x=0nlxmxe−rx Where n is the number of age classes, lx is the probability of survival from birth to Age Class x, and mx is the average number of births per individual in Age Class x. The intrinsic rate of increase, r, has been calculated for &gt;50 chronic toxicity tests on effluents from publicly owned treatment works (POTWs), metal refinishers, and acid-mine drainage. The hypothesis was that the intrinsic rate of increase is a sensitive endpoint for
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Fecundity and survival data can be used to calculate a number of demographic measures which characterize populations including net replacement rate, generation length, life xpectancy, and reproductive value. Another measure is r, lternately called the intrinsic or instantaneous rate of population increase. This statistic is a measure of the capacity of a population to increase in an unlimited environment and is in estimate of ecological growth potential. The equation of Lotka (1925) for calculating the intrinsic rate of increase is 1=∑x=0nlxmxe−rx Where n is the number of age classes, lx is the probability of survival from birth to Age Class x, and mx is the average number of births per individual in Age Class x. The intrinsic rate of increase, r, has been calculated for &gt;50 chronic toxicity tests on effluents from publicly owned treatment works (POTWs), metal refinishers, and acid-mine drainage. The hypothesis was that the intrinsic rate of increase is a sensitive endpoint for
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