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EFFECTS OF PUPA LIGATIONS ON DEVELOPMENT OF THE ADULT FEMALE SAWFLY, NEODIPRION SERTIFER (HYMENOPTERA: DIPRIONIDAE)1

Published online by Cambridge University Press:  31 May 2012

W. H. Fogal
W. H. Fogal
Affiliation:
Canadian Forestry Service, Petawawa Forest Experiment Station, Chalk River, Ontario K0J 1J0
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Abstract

Ligation experiments were conducted on freshly-ecdysed pupae of Neodiprion sertifer (Geoff.) to help identify sources of hormones which might control development of cuticle, rate of heartbeat, egg production, and uric acid depletion in adult females. Ligatures behind the head or thorax have little or no effect on apolysis of abdominal cuticle. Cuticle tanning and initiation of yolk formation are inhibited exclusively by ligatures behind the thorax. Increase in heartbeat rate and ovary weights is inhibited slightly by ligatures behind the head and almost completely by those behind the thorax. Uric acid depletion is inhibited equally by both ligations. The results are discussed in relation to current knowledge of the anatomy of endocrine organs in sawflies and insect endocrine functions in general.

Résumé

On a procédé à des expériences de ligatures sur des pupes de Neodiprion sertifer (Geoff.) après une ecdysis tout fraîche, afin d’aider à identifier les sources d’hormones susceptibles de contrôler le développement de la cuticle, le taux des battements du cœur, la production d’œufs et l’épuisement de l’acide urique chez les femelles adultes. Les ligatures derrière la tête ou le thorax ont peu ou pas d’effet sur l’apolyse de la cuticle abdominale. Le tanin de la cuticule et l’origine de la formation du jaune d’œuf sont inhibés exclusivement parles ligatures derrière le thorax. L’augmentation des battements cardiaques et du poids des ovaires est légèrement retenue par les ligatures derrière la tête et presque entièrement par les ligatures derrière le thorax. L’épuisement de l’acide urique est également empêché par les deux types de ligatures. L’auteur discute des résultats obtenus grâce aux connaissances actuelles de l’anatomie des organes endocriniens chez les tenthrèdes et des fonctions endocrines chez les insectes en général.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 5 , 01 May 1978 , pp. 541 - 546
Copyright
Copyright © Entomological Society of Canada 1978

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