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COMPARISON OF AGE STRUCTURE OF THREE MELANOPLUS SPP. (ORTHOPTERA: ACRIDIDAE) IN WINTER WHEAT AND ADJACENT RANGELAND

Published online by Cambridge University Press:  31 May 2012

Robert L. Gillespie  and
William P. Kemp
Robert L. Gillespie
Affiliation:
Washington State University, Cooperative Extension, Courthouse, Box 37, Ephrata, Washington, USA 98823
William P. Kemp
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA 59717-0366
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Abstract

Significant differences in age structure of grasshopper populations [Melanoplus sanguinipes (Fabricius), M. bivittatus (Say), and M. packardii Scudder] occurred in winter wheat and adjacent rangeland. In 1988, age structure differences were associated with density shifts in winter wheat between sample periods suggesting that older instars dispersed into the crop but younger instars remained in rangeland. In 1989 there was some partitioning of age classes between the two habitats, but no pattern emerged as in 1988. In 1990, significantly more older instars were collected in winter wheat than in rangeland. There were shifts in percentage density of the three grasshopper species in winter wheat but again no patterns emerged.

Résumé

Des différences significatives de la structure en fonction de l’âge ont été enregistrées chez les populations de trois espèces de Melanoplus [M. sanguinipes (Fabricius), M. bivittatus (Say) et M. packardii Scudder] dans des cultures de blé d’hiver et dans les zones de pâturage adjacentes. En 1988, les différences de structure en fonction de l’âge étaient associées aux changements de densité du blé entre les périodes d’échantillonnage, ce qui indique que les stades avancés se sont dispersés dans la récolte, mais que les stades plus jeunes sont restés dans les zones de pâturage. En 1989, il y avait bien séparation des classes d’âge entre les deux habitats, mais il n’y avait pas de pattern très défini comme en 1988. En 1990, un nombre significativement plus élevé d’individus des stades avancés ont été récoltés dans le blé d’hiver que dans les pâturages avoisinants; la densité (en pourcentage) des trois espèces s’était modifiée dans le blé d’hiver, mais il n’y avait pas de ségrégation définie comme en 1988.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 6 , December 1994 , pp. 1277 - 1285
Copyright
Copyright © Entomological Society of Canada 1994

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