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Effect of temperature on the ovarian development in the pupa of Glossina pallidipes Austen I: Estimation of the environmental temperature exposure from the size of the first egg follicle

Published online by Cambridge University Press:  19 September 2011

Mohamed M. Mohamed-Ahmed ,
Leonard H. Otieno ,
Steve Mihok  and
Joseph Muchiri
Mohamed M. Mohamed-Ahmed
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
Leonard H. Otieno
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
Steve Mihok
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
Joseph Muchiri
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30772, Nairobi, Kenya
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Abstract

Newly-deposited pupae Glossina pallidipes were incubated until emergence at constant temperature (20.5, 22.5, 25.0, 27.5, and 29.5°C) and compared with pupae held at ambient conditions (19 to 31°C). Egg follicles and enclosed oocytes of newly-emerged females were dissected and their lengths measured together with the lengths of the cutting blade of the hatchet cell of the right and left wings. Linear discriminant functions analysis showed that the mean length of egg follicle A accounted for 80% of the temperature-related variability. We therefore used a simple predictive equation for temperature experience based on mean follicle length in small batches of newly-emerged females. The equation predicted with reasonable accuracy the temperature experience of 19 monthly samples of newly-emerged G. pallidipes reared in an insectary under ambient conditions. Mean sizes of egg follicle A of the newly-emerged tsetse may therefore be of utility in estimating temperature experience of pupae.

Résumé

Des pupes nouvellement pondues de Glossina pallidipes ont été incubées jusqu'à l'émergence à des températures constantes (20,5, 22,5, 25,0, 27,5 et 29,5°C) puis comparées aux pupes exposées aux conditions ambiantes (19 à 31°C). Les follicules d'oeufs et les oocytes y inclus des femelles nouvellement émergées ont été dissequés et leurs longueurs mesurées en relation avec celles du côté tranchant de la cellule en forme de hâche des ailes droite et gauche. L'analyse du composant majeur a montré que la longuer moyenne du follicule d'oeuf A était responsable pour 80% de la variabilité induite par la température. Nous avons par conséquent utilisé une simple équation prédictive pour la température d'exposition basée sur la longueur moyenne du follicule sur un petit groupe de femelles nouvellement écloses. L'équation a prédit avec relativement d'exactitude la température d'exposition de 19 échantillons mensuels de G. pallidipes nouvellement émergées élevées dans un insectarium aux conditions ambiantes. La taille moyenne du follicule A du tsé tsé nouvellement éclos peut par conséquent être utile pour l'estimation de la température d'exposition des pupes.

Keywords

Glossina pallidipespupaeegg follicleswingstemperatureGlossina pallidipespupefollicules d'oeufsailestempérature
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 15 , Issue 3 , June 1994 , pp. 361 - 365
Copyright
Copyright © ICIPE 1994

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