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Fig. 4. Responses to differently sized colored obstacles by T. cystophora.
The thickness of the histogram bars follows the width of the obstacles. The
medusae responded more strongly to the wide obstacles than to the thin ones.
When comparing obstacles of the same color (e.g. red 2 cm vs red 1
cm), medusae had fewer contacts with (B) and performed avoidances further away
from (C) the wide obstacles. The rate of avoidance did not differ with
obstacle size (A). When converting the distances of avoidance into visual
angles none of the pairs differed significantly (D). N=10 except for
the thin green obstacle where N=6. Values are means and error bars
indicate s.e.m. *P values between 0.05 and 0.0001 from
ANOVA with Bonferroni–Dunn post hoc test.
**P values <0.0001.
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