. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF SEDENTARY ORGANISMS 21 In another series of experiments conducted for 24 hours (Fig. 2) using black, opal and clear plates held both in the horizontal and in the vertical positions, the black plates consistently showed much larger popu- lations. In addition, the variable nature of the response to the geotropic factor was here again confirmed. For all three types of plates the lowest w _Q> O ro c v. 10 CO I E 10 •f- o 1400 1200 000 800 600 400 €>0pal Plates O Clear Plates. 200 | 0° 90° 180° Angle of Plates
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF SEDENTARY ORGANISMS 21 In another series of experiments conducted for 24 hours (Fig. 2) using black, opal and clear plates held both in the horizontal and in the vertical positions, the black plates consistently showed much larger popu- lations. In addition, the variable nature of the response to the geotropic factor was here again confirmed. For all three types of plates the lowest w _Q> O ro c v. 10 CO I E 10 •f- o 1400 1200 000 800 600 400 €>0pal Plates O Clear Plates. 200 | 0° 90° 180° Angle of Plates FIG. 2. Orientation of barnacles on black, opal and clear plates held in the horizontal and vertical positions. counts were found at the 90° angle, at the three angles were: Black- Opal Clear The total number of individuals 2750 1484 1204 Table V shows the results of an experiment in which one unit of black and one of clear plates were examined after being held in a hori- zontal position in the sea for periods of 1,3, 5, and 7 days. The results show: (a) no significant difference in the population size of the under. 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
