title: [Influence of light conditions and the presence of a laying substratum on ovarian function of virgin female Hydrellia griseola Fall. (Diptera, Ephydridae)].
abstract: None or very few eggs are deposited by young virgin Hydrellia griseola when exposed to constant darkness or deprived of any ovipositional substrate. Ovaries of such females have been investigated in order to find out what happens with the matured eggs. Under suitable conditions (photoperiodic regime and host-plant provided), oviposition occurs only over a fixed level of congestion of the ovaries. Under constant darkness there is neither accumulation nor deficiency in mature eggs. The withholding of the ovipositional substrate induces their accumulation in the ovarioles. In both cases, less eggs are produced. The alteration of the efficiency of the ovaries resulting from an important or complete reduction of oviposition takes different forms, depending on which stimulus is cut off.
mesh_terms: D000818:Animals; D002452:Cell Count; D003624:Darkness; D004175:Diptera / Q000502:physiology*; D004777:Environment; D005260:Female; D008027:Light; D009865:Oocytes; D009866:Oogenesis; D010058:Oviposition; D010507:Periodicity
vernacular_title: Influence des conditions d'éclairement et de la présence d'un substrat de ponte sur le fonctionnement ovarien des femelles vierges d'Hydrellia griseola Fall. (Diptère ephydridae)