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Fig. 8. CE exposure, time to explore and shadow responses. Top, the mean
(±s.e.m.) time to explore for snails placed in PW after a 2 h exposure
to PW, CE or BC. Time to begin to explore in the CE treatment was
significantly longer compared with snails in PW and snails in BC treatment
(N=54, *P<0.001, one-way ANOVA). Bottom,
snails in CE elicited full pneumostome withdrawal significantly more often
when presented with a passing shadow than did snails in PW or BC (from
Orr et al., 2007).