. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1 0 -, 1 0 - 10° H JO1- 1 0 DUSK. 400 500 f 600 700 400 WAVELENGTH nm 500 600 700 FIGURE 2. Action spectra for photoperiodic induction of development in response to dawn and dusk pulses of monochromatic light. Energy necessary to promote a threshold (bottom curve), 50% (middle curve), or saturation (top curve) response is plotted as a function of wavelength; open circles, interpolated point; dotted circles, extrapolated point. sensitive to small quantities of light at 540 nm, probably less than 10~2 ergs cnr2 sec \ Sensitivi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 1 0 -, 1 0 - 10° H JO1- 1 0 DUSK. 400 500 f 600 700 400 WAVELENGTH nm 500 600 700 FIGURE 2. Action spectra for photoperiodic induction of development in response to dawn and dusk pulses of monochromatic light. Energy necessary to promote a threshold (bottom curve), 50% (middle curve), or saturation (top curve) response is plotted as a function of wavelength; open circles, interpolated point; dotted circles, extrapolated point. sensitive to small quantities of light at 540 nm, probably less than 10~2 ergs cnr2 sec \ Sensitivity to lit/lit diirini/ tlie dark period Sensitivity to light during the dark period was assessed by providing asymmetric skeleton photoperiods. Samples of 50 larvae without food were exposed to eight hours of white light plus a 30 minute white-light pulse at various times during the dark period. Thus, successive samples would receive 8L:-JD: ^L: 15D, 8L: ID : |L : 14iD, . . 8L: 15D : -JL: £D. Two control experiments of 100 larvae each were run concurrently and consisted of a 17L: 17D regimen without food. Larvae experienced asymmetric skeleton or control photoperiods for 10 days at 23± H° C after which they were transferred to short-day photoperiod (12L: 12D) at the same temperature. Development was scored after 5 additional days and the experiment Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
