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The Estimation of Insect Density and Instar Survivorship Functions from Census Data

Martin Birley
Journal of Animal Ecology
Vol. 46, No. 2 (Jun., 1977), pp. 497-510
DOI: 10.2307/3826
Stable URL: http://www.jstor.org/stable/3826
Page Count: 14
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The Estimation of Insect Density and Instar Survivorship Functions from Census Data
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Abstract

(1) A technique is described for analysing insect census data grouped by stage, where a population has been sampled at irregular intervals, every few days, throughout one generation. (2) The daily survivorship function is reconstructed using either a functional formulation or a set of minimum constraints. Stage recruitment, duration, mortality and relative sampling efficiency are then estimated. (3) The method can account for the effect of pesticide applications and climatic disturbances. (4) A set of field data is presented as an illustration.

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