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Fig. 6. Response to differently sized colored obstacles by C. bronzie. The
thickness of the histogram bars follows the width of the obstacles. Again, the
wide obstacles provoked the strongest responses (A–C). Only a weak
response was seen when the medusae were presented with thin obstacles and the
medusae spent up to 31% of the time in contact with them (blue bar in B). The
thin obstacles evoked a total of only eight avoidances (C). When mean distance
for avoidance is transformed into visual angles similar values are seen across
obstacle size (D). There is some more variation in the visual angles but this
is probably due to the very low value for N (1 or 3) for the thin
obstacles. N=10 for wide obstacles and 6 for thin obstacles, unless
shown otherwise in the bars (repeats in A and B; recorded events in C and D).
Values are means and error bars indicate s.e.m. *Significant
difference at the 0.10 level from t-test, **significant
differences at the 0.05 level.
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