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ESTIMATING STAGE SURVIVAL FROM RECRUITMENT AND DENSITY DATA, WITH REFERENCE TO EGG MORTALITY IN THE COLORADO POTATO BEETLE, LEPTINOTARSA DECEMLINEATA (SAY) (COLEOPTERA: CHRYSOMELDIAE)

Published online by Cambridge University Press:  31 May 2012

R.G. Van Driesche ,
T.S. Bellows Jr. ,
D.N. Ferro ,
R. Hazzard  and
A. Maher
R.G. Van Driesche
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
T.S. Bellows Jr.
Affiliation:
Department of Entomology, University of California, Riverside, California, USA92521
D.N. Ferro
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
R. Hazzard
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
A. Maher
Affiliation:
Department of Entomology, University of Massachusetts, Amherst, Massachusetts, USA01003
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Abstract

Stage survival is typically calculated from estimates of numbers entering two successive life stages. We present a method that estimates stage survival by reference to the difference between directly measured recruitment to the stage and the estimate of recruitment obtained from Southwood and Jepson’s graphical technique. The method assumes mortality is constant within the stage. The method is applied to two generations (at two sites) of the egg stage of the Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), and the predicted stage survivals are compared, for two generations, with direct field measurements of egg mortality.

Résumé

La survie d’un stade est typiquement calculée à partir d’estimés des nombres entrant dans chacun de deux stades successifs. On présente une méthode d’estimation par référence à la différence entre le recrutement du stade mesuré directement et l’estimé du recrutement obtenu par la méthode graphique de Southwood et Jepson. Cette méthode suppose que la mortalité est constante au cours du stade. On a appliqué la méthode à deux générations (de deux localités) d’oeufs du doryphore de la pomme de terre Leptinotarsa decemlineata (Say) (Coleoptera : Chrysomelidae), et on a comparé les survies prédites pour les deux générations, aux mesures directes de la mortalité des oeufs sur le terrain.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 3 , March 1989 , pp. 291 - 300
Copyright
Copyright © Entomological Society of Canada 1989

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