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A TEMPERATURE- AND AGE-DEPENDENT SIMULATION MODEL OF REPRODUCTION FOR THE NORTHERN CORN ROOTWORM, DIABROTICA BARBERI SMITH AND LAWRENCE (COLEOPTERA: CHRYSOMELIDAE)

Published online by Cambridge University Press:  31 May 2012

Steven E. Naranjo  and
Alan J. Sawyer
Steven E. Naranjo
Affiliation:
Department of Entomology, Cornstock Hall, Cornell University, Ithaca, New York, USA 14853
Alan J. Sawyer
Affiliation:
Department of Entomology, Cornstock Hall, Cornell University, Ithaca, New York, USA 14853
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Abstract

Based on data collected at seven constant temperatures, a temperature- and age-dependent model for reproductive development and oviposition by Diabrotica barberi Smith and Lawrence was developed. The model couples temperature-dependent rate and temperature-independent distribution models to represent the observed variability in developmental times for pre-reproductive, reproductive, and post-reproductive females. Using a cohort approach to maintain a physiological age structure, development was coupled with a temperature- and age-dependent model of oviposition. The model was validated at one constant-temperature and three variable-temperature regimes in the laboratory. The time spent in the pre-reproductive stage was slightly underestimated by the model, but the development of mature females and both the timing and magnitude of oviposition under fluctuating-temperature regimes were accurately predicted. The model was relatively insensitive to errors in estimation of the rate of development in the pre-reproductive stage but sensitive to errors in estimation of developmental rate of the reproductive stage and fecundity. Errors in input temperatures were found to be very important, stressing the need for accurately measuring temperature, The major driving variable. The model should be a valuable aid toward understanding oviposition by D. barberi in the field.

Résumé

On a développé un modèle dépendant de l’âge et de la température pour le développement reproducteur et l’oviposition des Diabrotica barberi Smith and Lawrence à partir de données obtenues à sept températures constantes. Le modèle relie le modèle du taux dépendant de la température et le modèle de distribution indépendant de la température afin de représenter la variabilité observée dans les temps de développement de femelles pré-reproductrices, reproductrices et post-reproductrices. En utilisant un système cohorte maintenant une structure d’âge physiologique, ce dévelopement a été relié à un modèle d’oviposition dépendant de la température et de l’âge. Au laboratoire, le modèle a été validé à une température constante et à trois régimes des températures variables. Le temps passé sur le stade pré-reproducteur a été légèrement sous-estimé par le modèle mais le développement des femelles mûres ainsi que le minutage et la magnitude de l’oviposition soumis à des régimes de températures fluctuantes ont été tous les deux prédits sans erreurs. Le modèle a été plus ou moins insensible aux erreurs d’estimation du taux de développement pour le stade pré-reproducteur et la fécondité. On a trouvé que les erreurs dans les températures d’entrée avaient des conséquences importantes, renforçant l’importance des mesures exactes des températures, celles-ci étant la variable conductrice majeure. Le modèle devrait aider d’une manière significative à comprendre l’oviposition des D. barberi sur le terrain.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 1 , January 1988 , pp. 1 - 17
Copyright
Copyright © Entomological Society of Canada 1988

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