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Fonctionnement de l'Appareil Reproducteur de la Femelle de Sitotroga Cerealella [Lep. Gelechiidae]

Fonctionnement de l'Appareil Reproducteur de la Femelle de Sitotroga Cerealella [Lep.... Summary J. Stockel: Physiology of the female reproductive system of Sitotroga cerealella Oliv. (Lep. Gelechiidae) The reproductive apparatus of the female S. cerealella functions in the manner typical of the Lepidotera described by Bourgogne (in Grassé, 1951). Directly after mating, activation of the sperm takes place within the spermatophore itself. This activation, like the maintenance of the activated state seems to be of a neuro-humoral nature and controlled by the cephalic nervous system of the female. Next, migration of the spermatozoïds begins, continuing for at last 6 hours. The spermatozoïds do not migrate of their own accord. Their movement is conditionned by the integrity of the tissues of the bursa copulatrix, the muscular contractions of which are necessary to rupture the sheath of the bulb of the spermatophore and subsequently for the propulsion of the sperm in the seminal canal towards the spermathecum. The migration appears to be facilited both by the presence of secretions, originating in the gland of the spermathecum which fill and lubricate the passages leading to it and by a particular anatomical structure at the end of the seminal canal forming a kind of « valvule » at the level of the oviduct, thus canalising the spermatozoïds towards the seminal receptacle. Vitellogenesis continues throughout the life of the female. If she is not fertilised, no deposition of eggs occurs and there exists therefore a process of ovocyte regulation: the oldest ovocytes are resorbed in a specialized organ: the seminal vesicle. In the virgin female the rythm of vitellogenesis diminishes until death but at any time, a fertile mating, even if belated, brings about an acceleration of this rythm and the egg laying which follows enables a partial « catching up » of the period ox sexual inactivity. The oosorption assures the maintenance of a significant reproductive potential in the virgin female of S. cerealella by the permanent presence of mature and young oocytes ready to be fertilized and subsequently deposited. From the ecological standpoint, the principal effect of this process is to increase in this insect the chances of producing offspring by extending to the maximum the period of reproduction of the female. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Annales de la Société entomologique de France (N S ) Taylor & Francis

Fonctionnement de l'Appareil Reproducteur de la Femelle de Sitotroga Cerealella [Lep. Gelechiidae]

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Publisher
Taylor & Francis
Copyright
© 1973 Société entomologique de France
ISSN
2168-6351
eISSN
0037-9271
DOI
10.1080/21686351.1973.12278938
Publisher site
See Article on Publisher Site

Abstract

Summary J. Stockel: Physiology of the female reproductive system of Sitotroga cerealella Oliv. (Lep. Gelechiidae) The reproductive apparatus of the female S. cerealella functions in the manner typical of the Lepidotera described by Bourgogne (in Grassé, 1951). Directly after mating, activation of the sperm takes place within the spermatophore itself. This activation, like the maintenance of the activated state seems to be of a neuro-humoral nature and controlled by the cephalic nervous system of the female. Next, migration of the spermatozoïds begins, continuing for at last 6 hours. The spermatozoïds do not migrate of their own accord. Their movement is conditionned by the integrity of the tissues of the bursa copulatrix, the muscular contractions of which are necessary to rupture the sheath of the bulb of the spermatophore and subsequently for the propulsion of the sperm in the seminal canal towards the spermathecum. The migration appears to be facilited both by the presence of secretions, originating in the gland of the spermathecum which fill and lubricate the passages leading to it and by a particular anatomical structure at the end of the seminal canal forming a kind of « valvule » at the level of the oviduct, thus canalising the spermatozoïds towards the seminal receptacle. Vitellogenesis continues throughout the life of the female. If she is not fertilised, no deposition of eggs occurs and there exists therefore a process of ovocyte regulation: the oldest ovocytes are resorbed in a specialized organ: the seminal vesicle. In the virgin female the rythm of vitellogenesis diminishes until death but at any time, a fertile mating, even if belated, brings about an acceleration of this rythm and the egg laying which follows enables a partial « catching up » of the period ox sexual inactivity. The oosorption assures the maintenance of a significant reproductive potential in the virgin female of S. cerealella by the permanent presence of mature and young oocytes ready to be fertilized and subsequently deposited. From the ecological standpoint, the principal effect of this process is to increase in this insect the chances of producing offspring by extending to the maximum the period of reproduction of the female.

Journal

Annales de la Société entomologique de France (N S ) – Taylor & Francis

Published: Jul 31, 1973

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