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PubMed1984

[Experimental schistosomiasis III. Observations on the infestation of Biomphalaria glabrata by a miracidium of Schistosoma mansoni].

380 B. glabrata infected with 1 miracidium of S. mansoni produced 87 positive snails (22,9%), 38 of which sending out male cercariae and 49 female cercariae. The snails belonged to 3 experimental series kept at 27 degrees and 24 degrees C for 15 weeks under continuous lighting. There was no difference between the proportions of both sexes. The survival of the positive snails was favoured by the male sex. The shedding of female cercariae was greater than shedding of male. During those 15 weeks, the cercarial shedding of both sexes showed large and recurring changes. A certain correlation seems to exist between the sex of cercariae, the abundance and the frequency of cercarial shedding, and the longevity of the parasitized snails. All those factors could take a part in the epidemiology of the schistosomiasis.

Animals↗
PubMed1975

[The chronobiology of the cercaria of Ribeiroia marini (Faust and Hoffman, 1934) parasite of Biomphalaria glabrata: effect of the photoperiod on the rhythm of emergence].

Ribeiroir marini cercariage emerge from the snail-host during the night, according to a circadian rhythm. The photoperiod is the synchronizer of this rhythm. Inversion of the photoperiod is immediately followed by inversion of the periodicity of emergence. No cercaria emerge in continuous light conditions. This inhibitory effect of light exerts its influence on the emergence but not on the production of cercariae. The rhythmic emergence is almost maintained in continous dark, but darkness cannot induce emergence at any time. It is possible that an innate production rhythm interferes with the emergence rhythm.

Biomphalaria↗