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Invalid estimates of rate of population increase from Glossina (Diptera: Glossinidae) age distributions

Published online by Cambridge University Press:  10 July 2009

J. Van Sickle
J. Van Sickle
Affiliation:
Department of Biological Sciences, University of Zimbabwe, PO Box MP167, Harare, Zimbabwe
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Abstract

Several published reports have presented estimates of the rate of increase, r, based on sampled ovarian age distributions from Glossina populations throughout Africa. These estimates are invalid, because an age distribution sampled at one point in time can be equated to a survivorship curve only if r = 0. When such a survivorship curve and a corresponding fecundity schedule are then used to estimate r via the Euler-Lotka equation, the result is a value of r near zero, regardless of the population's true rate of increase. Synthetic sampling from a hypothetical tsetse population confirmed that estimates computed in this fashion are entirely the products of sampling error. Valid estimates of r can sometimes be obtained from an age distribution, using an alternative method, but such estimates are highly sensitive to sampling errors in the distribution.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 78 , Issue 1 , March 1988 , pp. 155 - 161
Copyright
Copyright © Cambridge University Press 1988

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