The study of snails by Johnson et al. (2009) found that increasing species richness and

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Increasing species richness and increasing population density can both decrease parasite transmission. This is because a more diverse community of snails is less likely to be infected with a particular parasite, and a higher population density of snails means that there are more potential hosts for the parasite, which can dilute the infection.

The Study of Snails by Johnson Et Al