. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 622 M. R. PATTERSON FLOW. ATION V 2. 0 cm Figure 5. Deformation of polyps on the surface of a small colony is visible in this tracing made from a Super 8 mm film of the colony in still water and then in a flow of cm-s"' measured at the level of the height of the colony 10 cm upstream. Note the lack of deflection of the polyps in the wake of the colony. The separation point was determined using a filament of dye. Discussion Flow in nature Colonies of ^4. siderium typically occur on shallow (<20 m depth) subtidal v
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 622 M. R. PATTERSON FLOW. ATION V 2. 0 cm Figure 5. Deformation of polyps on the surface of a small colony is visible in this tracing made from a Super 8 mm film of the colony in still water and then in a flow of cm-s"' measured at the level of the height of the colony 10 cm upstream. Note the lack of deflection of the polyps in the wake of the colony. The separation point was determined using a filament of dye. Discussion Flow in nature Colonies of ^4. siderium typically occur on shallow (<20 m depth) subtidal vertical rocky substrates with some colonies occurring on the undersides of boulders, on horizontal rock surfaces, and on Modiolus shells attached to rock. The flow envi- U = 2. 7 CM S 12. 2 CM S 19. B CM S 45 40 35 30 DC 20 LU °- 15 10 5 0 45 40 35 30 25 ^20 30 50 90 120 150 ISO DEGREES 15 10 5 0 45 40 35 30 S 25 u '^ 15 10 5 0 30 50 90 120 150 180 DEGREES 0 30 60 90 120 150 180 DEGREES Figure 6. Angular position of prey capture events for increased levels of turbulence at three difterent flow speeds. Data from the bilateral halves of the colony are pooled; hence the abscissa runs from 0 to 180 degrees, with 180 degrees being the extreme downstream point. Capture frequencies are normalized relative to the amount of colony area (and hence number of polyps) available for prey capture. Vertical bars are 95% confidence intervals. For flow speeds of , , and cm -s"', the number of colonies fed were 10, 10, and 11, and the total number of cysts caught were 383, 305, and 747, 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;
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