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Thermal preferences of resistant and susceptible strains of Biomphalaria glabrata (Gastropoda) exposed to schistosoma mansoni (Trematoda)

Published online by Cambridge University Press:  06 April 2009

H. Lefcort
Affiliation:
Department of Zoology, Oregon State University, Corvallis, OR 97331, USA
C. J. Bayne
Affiliation:
Department of Zoology, Oregon State University, Corvallis, OR 97331, USA

Extract

The thermal preferences of two strains of the snail Biomphalaria glabrata, one resistant to, and one susceptible to, the parasite Schistosoma mansoni were determined in an aquatic thermal gradient. Snails were tested without exposure to the parasite, and 2 h and 5 weeks after exposure to trematode miracidia. The mean temperature selected by susceptible strain snails 2 h post-exposure tended to be lower than that of unexposed controls, although this was not statistically significant. In this strain, at 5 weeks post-exposure, the preferred temperature dropped by 1.9±0.5°C. The resistant strain displayed a significant drop of 1.8±0.6°C 2 h post-exposure. These results are consistent with the hypothesis that a drop in mean temperatures selected by snails is due to altered levels of endogenous cytokines such as IL-1 or TNF in association with parasite activation of the snail internal defense system.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1991

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