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Bi‐modal sensitivity to monochromatic light by the mud snail Ilyanassa obsoleta † |
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| Authors: | Ronald V Dimock Jr Jeffrey R Parno |
| Institution: | 1. Department of Biology , Wake Forest University , Winston‐Salem, North Carolina, 27109, USA;2. Department of Biology , Wake Forest University , Winston‐Salem, North Carolina, 27109, USA;3. Division of Public Health , University of Massachusetts , Amherst, Massachusetts, 01003, USA |
| Abstract: | Under laboratory conditions the mud snail Ilyanassa obsoleta exhibits a pronounced positive behavioral response to monochromatic light. The response spectrum for‐this positive phototaxis has maxima at 480 nm and 560–580 nm. The threshold intensities for this response are 2.06 x 10‐7 /μW/cm2 for 480 nm and 2.18 × 10‐7 μW/cm2 for 580 nm. These results are suggestive of Ilyanassa's possessing two visual pigments with different absorption maxima. |
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