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Journal Article

A Computer Program for Calculation and Statistical Comparison of Intrinsic Rates of Increase and Associated Life Table Parameters

Fred L. Hulting, David B. Orr and John J. Obrycki
The Florida Entomologist
Vol. 73, No. 4 (Dec., 1990), pp. 601-612
DOI: 10.2307/3495274
Stable URL: http://www.jstor.org/stable/3495274
Page Count: 12
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A Computer Program for Calculation and Statistical Comparison of Intrinsic Rates of Increase and Associated Life Table Parameters
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Abstract

An often crucial component in the study of insects is the determination of reproductive capabilities. While it is important to study reproduction at the level of the individual, it is often more desirable to develop a standardized estimate of the growth rate of insect populations. One such estimator, the intrinsic rate of increase (rm), has been used for many years by insect ecologists. This statistic is useful not only as a measure of population growth potential but also as a bioclimatic index and a natural enemy rating parameter. Recently introduced methods to calculate variances for rm values have increased the utility of the statistic, enabling comparisons of growth rates from different species or biotypes. Although these values are usually calculated with the help of a computer, programs to perform the required computations have not been widely available. In this paper we describe a computer program, written in Pascal, designed to simplify the calculation of intrinsic rates of increase and associated Jacknife estimates of variance. The program also computes (1) approximate confidence intervals, (2) several commonly used fertility table parameters with their standard errors, and (3) daily means for some of these parameters, which can be used for graphing data. /// Un componente crucial que ocurre a menudo en el estudio de insectos es la determinación de la capacidad de reproducción. Mientras que es importante estudiar la reproducción al nivel del indivíduo, a menudo es más deseable desarrollar un estimado patrón de la taza de crecimiento de las poblaciones de insectos. Un tal estimador, la taza intrínsica de aumento (rm), ha sido usada por ecologistas de insectos por muchos años. Esta estadística es útil no solo como una medida del potencial de crecimiento de la población, pero también como un índice bioclimático y un parámetro natural de la taza del enemigo. Métodos introducidos recientemente para calcular la varianza de los valores rm han aumentado la utilidad de la estadística, lo que ha permitido comparar la taza de crecimiento entre diferente especies o biotípos. Aunque estos valores son calculados usualmente con la ayuda de una computadora, los programas para llevar a cabo las computaciones requeridas no han estado comunmente disponibles. En este trabajo nosotros decribimos un program de computadora escrito en Pascal, diseñado para simplificar la calculación de tazas de aumentos intrínsicos y los estimados asociados de varianza Jacknife. El programa también computa (1) intervalos apróximados de confianza, (2) algunos parámetros comunmente usados en tablas de fertilidad con su patrón de errores, y (3) promedio diario para algunos de esos parámetros, los cuals se pueden usar para hacer gráficos de los datos.

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