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LIFE HISTORY PARAMETERS IN MELANOPLUS SANGUINIPES (F.) IN TWO CRESTED WHEATGRASS PASTURES

Published online by Cambridge University Press:  31 May 2012

Norma E. Sanchez  and
Jerome A. Onsager
Norma E. Sanchez
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
Jerome A. Onsager*
Affiliation:
Rangeland Insect Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Bozeman, Montana, USA59717–0001
*
3Author to whom reprint requests should be addressed.
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Abstract

A combination of published techniques provided point estimates of life history parameters for two natural field populations of Melanoplus sanguinipes (F.) in crested wheatgrass pastures. Stage-specific survival rates averaged 0.4798, 0.2261, 0.7628, and 0.6903 for egg, instars I–III combined, instar IV, and instar V, respectively. Daily survival rates of adults averaged 0.9702, but were slightly lower for females than for males. Estimated duration of nymphal instars averaged 8.4 days, the adult preoviposition period averaged 13.3 days, and adult longevity averaged 26.7 and 36.3 days in the two populations. Oviposition rates were estimated for up to four successive ovipositions, and net replacement rates of populations also were estimated. Neither population replaced itself, indicating that potential capacities for increase were not approached under conditions of these studies.

Résumé

Un ensemble de techniques publiées a permis d’obtenir des estimés ponctuels des paramètres du cycle évolutif de deux populations naturelles de Melanoplus sanguinipes (F.) dans les pâturages à agropyre à crête. Les taux de survie spécifique du stade étaient en moyenne de 0,4798, 0,2261, 0,7628 et 0,6903 pour les oeufs, les stades I à II combinés, le stade IV et le stade V. Les taux de survie journaliers des adultes étaient en moyenne de 0,9702, mais étaient légèrement plus faibles chez les femelles que les mâles. La durée moyenne des stades larvaires étaient de 8,4 jours, la période de préoviposition moyenne de 13,3 jours et la longévité moyenne de 26,7 et 36,3 jours chez les deux populations. Les taux de ponte ont été estimés pour un maximum de quatre pontes successives, et on a aussi estimé les taux nets de remplacement des populations. Aucune des populations ne s’est remplacée elle-même, indiquant que les capacités d’accroissement n’étaient pas atteintes dans les conditions de ces études.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 1 , January 1988 , pp. 39 - 44
Copyright
Copyright © Entomological Society of Canada 1988

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