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Fig. 10. Tritonia diomedea are inconsistent in their ability to stimulate
rhinophore responses. Eight rhinophores were established as responsive to
seawater with conspecific odour isolated from multiple slugs. Responses were
then recorded to odours from a pair of non-mating slugs and a pair of mating
slugs. Shown are the mean normalized spike counts with standard errors, for
each rhinophore for applications of control seawater, non-mating pair
seawater, and mating pair seawater. Lines link non-significant pairwise
comparisons between treatments within each rhinophore (ANOVA, followed by
Tukey's pairwise mean comparisons, P=0.05); *means significantly
different from both other treatments. Conspecific responsive units in the
rhinophores did not respond equally to odours isolated from specific pairs of
T. diomedea, suggesting that the odours are only intermittently
released.