. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 68 OLSON « 10 w. 13 D CT U ra OJ 0L Light Shade 0 Distance from surface of colony ( mm ) FIGURE 5. Distribution of algae through depth of colonies from sections of shade versus full sunlight colonies, n = 3 transects from 4 colonies each. Error bars are standard errors. Algal abundance is expressed as a relative measure (# cells/quadrat). Photoadaptation The difference in coloration of colonies (Fig. 1) is primarily due to their levels of phycobilin pigments. The algae of dissected light colonies are lig
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 68 OLSON « 10 w. 13 D CT U ra OJ 0L Light Shade 0 Distance from surface of colony ( mm ) FIGURE 5. Distribution of algae through depth of colonies from sections of shade versus full sunlight colonies, n = 3 transects from 4 colonies each. Error bars are standard errors. Algal abundance is expressed as a relative measure (# cells/quadrat). Photoadaptation The difference in coloration of colonies (Fig. 1) is primarily due to their levels of phycobilin pigments. The algae of dissected light colonies are light brown in color, those of shade colonies are dark purple, almost black. There was twice as much phy- coerythrin per unit of surface area in shade colonies than in sun colonies (Table II). Aqueous extracts of shade colonies were red in color versus light pink for sunlight colonies. Shade colonies also had a greater mean concentration of phycocyanin than light colonies. In addition to the differences in the amount of phycobilin pigment, extracts from the sun colonies had much greater absorbance in the ultraviolet-B region, with a peak absorbance around 330 nm. The difference in absorbance down to 400 nm can be seen in Figure 6. Shading experiment During the six days of the shading experiment, colonies beneath the dark roofs contracted and most began to deteriorate. Of the approximately 100 colonies beneath 0) U c «J .0 w O en 400 500 600 Wavelength ( nm ) 700 FIGURE 6. Absorbance spectra of water soluble pigments from representative light and shade colonies. PC—phycocyanin, PE— 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 Rat
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