Prevalence of metazoan parasites (live and shell-trapped) in three helicid species: Cornu aspersum, Cepaea nemoralis and Cepaea hortensis. Estimates are based on pooling all sites together.
|Cornu aspersum||Cepaea nemoralis||Cepaea hortensis|
|Number of snails sampled across all 20 sites||303||74||15|
|Number of sites with snail species present||17||4||1|
|− in which shell-trapped trematode cercariae were found||7||1||0|
|Prevalence, all sites pooled, of shell-trapped parasites:|
|− all metazoan parasites (trematodes and nematodes)||59.4%||83.8%||93.3%|
|− trematode cercariae||6.9%||1.4%||0.0%|
|Prevalence, all sites pooled, of live parasites:|
|− all metazoan parasites||43.2%||44.6%||6.7%|
|− trematode sporocysts/cercariae (in digestive gland)||6.6%||1.4%||0.0%|
|− trematode metacercariae (in kidney)||31.7%||33.8%||6.7%|
|− nematodes (in genitalia, lung, space or body-shell space)||13.9%||0.0%||0.0%|
|− mites (in lung)||0.0%||10.8%||0.0%|
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