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Fig. 5. (A,B) Mean (± S.E.M.) colour
contrasts of different body parts of typical Nephila pilipes viewed
by achromatic and chromatic vision. Broken lines indicate the threshold for
colour-contrast detection estimated for honeybees. (C,D) Schematic drawings
mimicking the (C) dorsum and (D) ventrum patterns perceived by bees using
chromatic vision. Body parts whose colour contrasts were smaller than the
discrimination threshold were given the same colour as the background, which
was artificially designated as black. Those with significantly higher values
were assigned different degrees of grey according to their contrast values.
Numbers correspond to areas shown in Fig.
1.
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