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Effet De L'Inoculation D'Une Bacterie Endocellulaire Feminisante Sur La Croissance Et La Reproduction Des Femelles Du Crustacé Oniscoïde Armadillidium Vulgare (Latr.). Consequences Possibles Sur L'Evolution Des Populations

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In the populations of Armadillidium vulgare the three different types of functional females can be distinguished: ZW genetic females and two types of neo-females (i.e., feminized males). Sexual reversal of males is caused by the feminizing action of either intracytoplasmic symbiotic bacteria (F) or a less stable f factor. The inoculation of crushed ovaries of symbiotic females (ZZF neo-) in non-symbiotic females (ZW 9 and ZZf neo-) does not alter the onset of reproduction. Growth, however, and consequently fertility, is considerably slowed down by the introduction of these feminizing bacteria. There is no such noticeable pathogenic effect in ZZf neo-females. These results are analyzed according to the various possible origins of the microorganism and of the different types of females. This phenomenon might have a certain impact on the evolution of populations.


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Affiliations: 1: Laboratoire de Biologie Animale de l'Université de Poitiers, UA CNRS no. 673 "Physiologie et Génétique des Crustacés", 40, Avenue du Recteur Pineau, 86022 Poitiers Cedex, France


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