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Fig. 7. Effect of surgical treatments on locomotory behaviours. (A) Percentage of
the three locomotory behaviours produced spontaneously by leeches in the five
experimental groups. Control, N=46; cut, N=9; missing 1, 2,
N=10; missing 1, 2, 3, N=10; missing, 1, 2, 3, 4,
N=9. (B) Locomotion elicited by moderate touch to the posterior
dorsal body. Control, N=46; cut, N=9; missing, 1, 2,
N=10; missing, 1, 2, 3, N=11; missing, 1, 2, 3, 4,
N=10. Locomotion was much less common in animals with ablations than
in controls or animals with nerve cuts
(Fig. 6A). Locomotion included
only swimming, crawling and incomplete crawling, so the sum of the bars for
each experimental condition is 100% and the percentages for the three modes of
locomotion are not independent. Within each set of bars (that is, for each
behaviour within each panel), conditions that are not significantly
different from one another are labelled by the same letter, A, B, C, etc., and
bars that are labelled by different letters are significantly
different from one another (differences among surgical treatment groups were
tested with a Kruskal-Wallis test, and post-hoc comparisons among
groups were done using a Tukey's HSD procedure on the ranked data). Bars that
are labelled with two or more letters are not significantly different from
bars labelled with any of the letters. This analysis includes a total
of six extra controls, and eight leeches with ablations were used in only this
analysis.
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