Fig. 2.

Schistosoma mansoni/Biomphalaria glabrata from field to laboratory compatibility. Change in levels of compatibility when using (a) wild-type parasites and wild-type snails directly collected from the field and (b) their derived respective strains when established in the laboratory. Infection rates are enumerated after individual exposure of snails to increasing doses of S. mansoni miracidia (Mi). The observed reduction in compatibility (arrows) may be explained under the hypothesis of a matching phenotype model of interaction (symbols represent phenotype diversity for compatibility between Biomphalaria snails and S. mansoni parasites). Due to laboratory conditions of maintenance, the parasite strain exhibits a reduced set of phenotypes that match only with a fraction of the host phenotypes (modified from Theron et al. (2008, 2004)).