. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 14 S. J. BRITZ AND H. H. SELIGER values were calculated from the relative transmittance at 682 nm using a cor- rection factor derived to account for the differences in transmittance between hori- zontal and vertical polarizing orientations of the filter. RESULTS Figure 1 shows a typical light absorption spectrum for an Ulva thallus at mid- photophase. At all wavelengths ROD values varied rhythmically with periods 55 °-8 :z Q I— < _l UJ at B 350 400 450 500 550 600 650 WAVELENGTH (nm) 700 750 800 8
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 14 S. J. BRITZ AND H. H. SELIGER values were calculated from the relative transmittance at 682 nm using a cor- rection factor derived to account for the differences in transmittance between hori- zontal and vertical polarizing orientations of the filter. RESULTS Figure 1 shows a typical light absorption spectrum for an Ulva thallus at mid- photophase. At all wavelengths ROD values varied rhythmically with periods 55 °-8 :z Q I— < _l UJ at B 350 400 450 500 550 600 650 WAVELENGTH (nm) 700 750 800 850 FIGURE 1. Typical in vivo absorption spectrum of mid-photophase Ulva lactitca L. recorded with a Bausch and Lomb Spectronic 505. See explanation under Results. of 24 hours. However, the time of maximum ROD varied with wavelength. For example. ROD maxima at 432, 470, 493, 560, 600, 654, 682, and 760 nm occurred at L + 9, L + 9, L + 9, L + 14, L + 14, L + 12, L + 9, and D + 2, respectively. Values of ROD at 760 nm. where pigment absorption should be negligible, are defined to represent relative light scattering. The above observations were then interpreted as resulting from the addition of two different rhythms—light absorption by the photosynthetic pigments and light scattering. The light absorp- tion rhythm seemed to have a maximum around mid-photophase, while light scatter-. 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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