. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 S. M. LINDSAY ET AL. 420 nm 500 nm 580 nm 600 nm. 50 Figure 8. Representative bioluminescent responses by a single specimen of Sergestes similis to different wavelengths of light. Bioluminescence was first induced using a 490 nm stimulus of intermediate intensity, then the specimen was presented with 60 s stimuli at various wavelengths, at approximately equal irradiance of x 10'-' photons m~- s '. Bars as for Figure 5. ments from single photoreceptors (reviewed by Goldsmith. 1986). ERG results do not reflect the amou
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 356 S. M. LINDSAY ET AL. 420 nm 500 nm 580 nm 600 nm. 50 Figure 8. Representative bioluminescent responses by a single specimen of Sergestes similis to different wavelengths of light. Bioluminescence was first induced using a 490 nm stimulus of intermediate intensity, then the specimen was presented with 60 s stimuli at various wavelengths, at approximately equal irradiance of x 10'-' photons m~- s '. Bars as for Figure 5. ments from single photoreceptors (reviewed by Goldsmith. 1986). ERG results do not reflect the amount of higher order processing of visual input, nor the behavioral response to visual stimuli. Thus the behavioral studies of luminescent countershading extend the physiological assessment, result- ing in a comprehensive description of the organism's sen- sory and behavioral response to ecologically relevant light stimulation. Luminescent countershading by S. xiniilis occurred over a relatively narrow range of irradiance. A behavioral thresh- old occurred at approximately 3 X 10|: photons m~2 s~', as lower irradiance levels resulted in minimal levels of biolu- minescence which were not significantly different from background. This illumination level may represent the min- imum irradiance causing light adaptation of the eye. which appears to be required for luminescent countershading (Latz and Case. 1992). Under ideal conditions, bioluminescence should exactly match stimulus irradiance. As discussed by Young et al. (1980), differences in geometry between stim- ulus and response as well as calibration assumptions make direct comparisons difficult, although relative changes should still be valid. In the present study, the range of stimulus irradiance tested was less than two orders of mag- nitude. Within this range, bioluminescence increased with stimulus irradiance according to a power law (log-log) regression as found by Young et al. (1980) for midwater squid and fish. However, t
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