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Infection dynamics of a sexually transmitted nematode (Mehdinema alii) in the decorated cricket (Gryllodes sigillatus)

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Abstract:

We investigated the transmission dynamics of a sexually transmitted nematode, Mehdinema alii, in the decorated cricket, Gryllodes sigillatus. Adult crickets were experimentally inoculated with infective stages of the nematode, called dauerlarvae, to determine the role of the female cricket in nematode transmission. We found that female crickets serve only as a means of mechanical transmission, so nematodes do not require passage through a female cricket to be infective. Dauerlarvae were experimentally placed on the genitalia of both sexes. In the male, the dauerlarvae migrated into the gut and proceeded to develop into adult nematodes, whereas those that were inoculated into the female genitalia failed to migrate into the gut. When dauerlarvae were inoculated directly into the female rectum, the nematodes failed to develop. Therefore, the female gut is not a suitable environment for nematode development. Dauerlarvae persisted in the female cricket for up to 12 days post inoculation and remained infective to male crickets.

Nous avons étudié la dynamique du transfert de Mehdinema alii, un nématode transmis sexuellement, au grillon Gryllodes sigillatus. Des stades immatures du nématode, les larves dauer, ont été inoculés à des grillons adultes pour déterminer le rôle des grillons femelles dans la transmission du parasite. Les femelles ne servent qu'à la transmission mécanique, si bien que le passage d'un nématode dans un grillon femelle n'est pas essentiel pour qu'il devienne infectieux. Lorsque des larves dauer sont déposées directement sur les genitalia des adultes des deux sexes, les nématodes migrent dans le tube digestif des mâles où elles continuent leur développement jusqu'à leur transformation en adultes. Les larves déposées directement sur les genitalia femelles ne font pas cette migration et lorsqu'elles sont placées directement dans le rectum de femelles, elles ne se développent pas. Il semble donc que le tube digestif des grillons femelles ne constitue pas un milieu propice au développement des nématodes. Les larves dauer peuvent vivre jusqu'à 12 jours après la transmission chez les femelles et elles restent infectieuses pour les grillons mâles.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2002-07-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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