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| Abstract |
The spectral sensitivity of the posterior median eye of the jumping spider, Hasarius adansoni, was investigated by recording electroretinograms. The spectral sensitivity curve had a maximum peak at ab...out 340-360 nm and an additional small peak at about 480 nm. The effect of UV light on behavior was examined with freely walking spiders. The experimental arena was cylindrical, about 65 mm in diameter and 3 mm in height, and covered with a quartz glass sheet. When one half of the arena was illuminated with a 360 nm light and the other half was illuminated with a 540 nm light, spiders walked longer period preferentially under the 360 nm light than under the 540 nm light. When the posterior median eye was occluded with black paint, some spiders walked longer period under the 540 nm light than under the 360nm light. We conclude that the posterior median eye is a UV receptor.show more
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