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DEVELOPMENT OF TWO RANGELAND GRASSHOPPERS AT CONSTANT TEMPERATURES: DEVELOPMENT THRESHOLDS REVISITED

Published online by Cambridge University Press:  31 May 2012

William P. Kemp  and
Brian Dennis
William P. Kemp
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
Brian Dennis
Affiliation:
College of Forestry, Wildlife, and Range Sciences, University of Idaho, Moscow, Idaho, USA83843
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Abstract

A study was conducted to examine the relationship between development rate and constant temperatures (14, 21, 24, 27, 33, 36, 40, and 45°C) for the rangeland grasshoppers Melanoplus sanguinipes (F.) and Aulocara elliotti (Thomas). Non-linear regression was used to generate estimates of lower development thresholds. The chosen model provided for a concave-shaped development rate function at temperatures above the lower threshold and required fewer parameters than previous models. Although experimental results suggested that no precise estimates of upper development thresholds could be obtained, previous field studies indicate that preferred body temperatures may be lower than ambient temperatures and probably are related in part to the thermoregulatory abilities of the two species studied. Results will be of interest to insect ecologists and those studying grasshopper biology as well as researchers and pest managers interested in predicting grasshopper development.

Résumé

On a effectué une étude pour examiner la relation entre le taux de développement et la température constante (14, 21, 24, 27, 33, 36, 40, et 45°C) chez les criquets de prairie Melanoplus sanguinipes (F.) et Aulocara elliotti (Thomas). La régression non-linéaire a été utilisée pour générer des estimés des seuils inférieurs de développement. Le modèle retenu permet une fonction de forme concave aux températures dépassant le seuil inférieur et requiert moins de paramètres que les modèles précédents. Quoique les résultats indiquaient qu’il est impossible d’estimer précisément les seuils thermiques supérieurs, des études antérieures sur le terrain indiquent que les températures corporelles préférées sont possiblement inférieures aux températures ambiantes, et probablement dépendantes en partie des capacités de thermorégulation des deux espèces étudiées. Les résultats pourront intéresser les entomologistes, écologistes ou acridologistes, ainsi que les chercheurs et phytoprotectionnistes intéressés aux prévisions du développement des criquets.

Type
Articles
Information
The Canadian Entomologist , Volume 121 , Issue 4-5 , April 1989 , pp. 363 - 371
Copyright
Copyright © Entomological Society of Canada 1989

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