Experimental observations on the sex ratio of adult Schistosoma mansoni, with comments on the natural male bias

Abstract : The sex ratio of adult worms has been observed biased towards males in Schistosoma mansoni under natural conditions. The origin of this bias is unknown. This paper determines whether males are more infective than females under controlled experimental bisexual conditions, and hence if the sex ratio is male-biased as a consequence of this. The male and female cercarial infectivities in uni- and bisexual vertebrate host infections using a range of controlled cercarial sex ratios were studied. The results showed that, in experimental unisexual infections, male cercariae were more infective than females, and that in experimental bisexual infections, male cercarial infectivity was similar to that of female, irrespective of cercarial sex ratio. Furthermore, cumulative male and female cercarial infectivity was maximal when sex ratio was equilibrated. The unbiased sex ratios obtained in our experimental bisexual infections are discussed in terms of behavioural and/or biochemical male female interaction. Alternative explanations of the natural biased sex ratio are proposed
Type de document :
Article dans une revue
Parasitology, Cambridge University Press (CUP), 2000, 121, pp.379-383
Liste complète des métadonnées

https://hal-sde.archives-ouvertes.fr/hal-01495938
Contributeur : Anne Modat <>
Soumis le : lundi 27 mars 2017 - 09:55:50
Dernière modification le : lundi 27 novembre 2017 - 14:36:01

Identifiants

  • HAL Id : hal-01495938, version 1
  • PUBMED : 11072900

Collections

Citation

J. Boissier, H. Moné. Experimental observations on the sex ratio of adult Schistosoma mansoni, with comments on the natural male bias. Parasitology, Cambridge University Press (CUP), 2000, 121, pp.379-383. 〈hal-01495938〉

Partager

Métriques

Consultations de la notice

101