. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 OLSON. FIGURE 3. Scanning electron micrograph of calcareous, stellate spicules and Synechocystis algae (small spheres) in the tunic of T. solidum. Top portion of photo is top of colony. (Photo by E. Seling.) free dry weights (ash-free dry weight/total dry weight) of ( = ; n = 9) and ( = ; n = 9), respectively. Thus light colonies have a significantly greater inorganic component (Mest, P < ). This difference is also reflected in the ratio of volume to dry weight (Table I) which shows
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 OLSON. FIGURE 3. Scanning electron micrograph of calcareous, stellate spicules and Synechocystis algae (small spheres) in the tunic of T. solidum. Top portion of photo is top of colony. (Photo by E. Seling.) free dry weights (ash-free dry weight/total dry weight) of ( = ; n = 9) and ( = ; n = 9), respectively. Thus light colonies have a significantly greater inorganic component (Mest, P < ). This difference is also reflected in the ratio of volume to dry weight (Table I) which shows that light colonies have a greater density than shade colonies. It appears that much of the difference could be accounted for by the top layer of the colonies. Very few, if any, spicules can be seen in the top 2-3 mm of shade colonies, whereas light colonies are generally packed to the top with spicules. Cross sections revealed a zone at the top of light colonies with very little algae (Fig. 5). 20 CO 0) 'c o o o I 10 0L Shade N = so Light N=SO 10 15 0 Surface area ( cm2 ) FIGURE 4. Size distribution, by surface area, of colonies from shade and full sunlight 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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