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Spectral sensitivity of the chaetognath sagitta hispida

, : Spectral sensitivity of the chaetognath sagitta hispida. Biological Bulletin (Woods Hole) 168(1): 32-38

Using phototaxis as a behavioral measure of photosensitivity, the spectral sensitivity of S. hispida Conant (Chaetognatha) was determined. S. hispida is most sensitive to blue-green light, with maximum sensitivity at 500 nm. From 400-580 nm, the shape of the action spectrum for phototaxis approximates an absorbance spectrum for a rhodspin-based visual pigment. Photoreception probably is mediated largely by a single major pigment. An accessory pigment may play a role in photoreception at longer wavelengths. S. hispida is adapted for greaster photosensitivity wherever blue-green light dominates the available spectrum. This finding is consistent with the geographical range of this species, which comprises relatively clear blue-green tropical and subtropical seas.

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