net reproductive rate


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net reproductive rate

,

NRR

A measure of whether a population is reproducing at a greater or lesser rate than needed for its replacement. It is determined by calculating the average number of surviving daughters born to the women in that population during their reproductive years. An NRR of 1 indicates that each woman in the population has one surviving daughter during her lifetime.
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The net reproductive rate (Ro) was 2,193.722 females per generation, the mean generation time (T) was 46.407 days, the daily intrinsic rate of increase (rm) was 0.166 and the daily finite rate of increase ([lambda]) was = 1.180.
The highest net reproductive rate (R0) of 216 offspring per individual was noted at 24 +- 0.5 AdegC and the lowest (27.07 offspring per individual) at 32 +- 4 AdegC.
Under the experimental conditions, net reproductive rate ([R.sub.0]), mean generation time (T), the intrinsic rate of increase (r), and finite rate of increase ([lambda]) of O.
Chi [33] demonstrated that the relationship among the mean female fecundity (F) and the net reproductive rate ([R.sub.0]) can be explained as
Three different schedules of the distribution of mortality within a year have different consequences for the annual contribution to net reproductive rate ([R.sub.0]).
9a, b allow us to compute the speed of invasion as a function of the net reproductive rate [R.sub.0] for each of these four density functions.
Population parameters (e.g., [R.sub.0], net reproductive rate; [r.sub.m], intrinsic rate of increase; etc.) are important indices to measure the potential population growth of a species under controlled conditions, as well as evaluate the potential distribution of the pest in new areas (Southwood & Henderson 2000).
The net reproductive rate was not found to be significantly different on various legumes (F=0.923; df=3.46; P=0.437).
The first (Roff 1984, 1986) maximizes net reproductive rate, and predicts optimal age and size at maturity using a simple relationship between growth and mortality rates.