. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 354 S. M. LINDSAY ET AL. 5 380 420 460 500 540 580 620 Wavelength (nm) Figure 3. Visual spectral sensitivity of Sergestes similis based on electroretinogram (ERG) measurements. Sensitivity, based on the inverse of the irradiance required to elicit a !()() or 200 response, showed a broad maximum centered around 500 nm. Symbols represent means ± SE for 6 specimens. curve across the spectrum (Fig. 4), and had no effect on ERG waveform (Fig. 5). These results are consistent with those of the MSP study
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 354 S. M. LINDSAY ET AL. 5 380 420 460 500 540 580 620 Wavelength (nm) Figure 3. Visual spectral sensitivity of Sergestes similis based on electroretinogram (ERG) measurements. Sensitivity, based on the inverse of the irradiance required to elicit a !()() or 200 response, showed a broad maximum centered around 500 nm. Symbols represent means ± SE for 6 specimens. curve across the spectrum (Fig. 4), and had no effect on ERG waveform (Fig. 5). These results are consistent with those of the MSP study indicating that only a single visual pigment is present. Behavioral sensitivity The magnitude of luminescent countershading by 5. si- milis depended on the level of stimulus irradiance (Fig. 6). , y> o jz Q. o dark adapted 480 nm adapted 380 420 460 500 540 580 620 , B dark adapted 400 nm adapted \ • o £. Q. ra-11 0- 3 -19 r>- ^a********* 380 420 460 500 540 580 620 Wavelength (nm) Figure 4. fitted »t chromatic adaptation on the spectral sensitivity of Sergestes similis. Illumination of the eyes with (A) 480 nm, and (B) 400 nm light uniformly depressed spectral sensitivity across the spectrum compared to the response of dark-adapted eyes. A ]B 1C D -\N%*- .*nr**" .*\P"** .*\r»**' 0 1 0 1 0 1 0 1 G H O> cr 0 1 0 1 0 1 0 1 Time (s) Figure 5. Effect of chromatic adaptation on the ERG waveform of Sergestes similis. Dark bars indicate light stimulus off; white bars indicate light stimulus on. (A-D) 200 /xV responses measured in one specimen. (E-H) 100 responses measured in another specimen. Response to a 430 nm stimulus for the (A) dark-adapted condition and (B) after 400 nm light adaptation. Response to a 530 nm stimulus for the (C) dark-adapted condition and (D) after 400 nm light adaptation. Response to a 430 nm stimulus for the (E) d
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