Effect of temperature and atmospheric pressure on the eggs of the intermediate snail hosts of schistosoma mansoni and schistosoma haematobium

Nojima, H.; Sato, A.

Japanese Journal of Parasitology 30(2): 121-126


Accession: 005274598

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Hatching rates and incubation periods of [Puerto Rican] Biomphalaria glabrata, [Kenyan] B. pfeifferi and [Kenyan] Bulinus globosus eggs were examined at different water temperatures and different atmospheric pressures. At 10.degree. and 35.degree. C, none of the eggs hatched and at the temperature between 15.degree.-32.degree. C, about 90% of the Biomphalaria spp. hatched, while the maximum hatching rate for Bulinus globosus was 57.9% at 25.degree. C. In all 3 spp., the higher the water temperature, the shorter the incubation period. Biomphalaria spp. eggs showed a tolerance for higher, while Bulinus globosus had a tolerance for lower, atmospheric pressures. In all 3 spp., the lower the atmospheric pressure, the longer the incubation period. [The 3 spp. are vectors of human schistosomiasis. This study has implications for the study of the zoogeography of these species.].