. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 608 K. RANGA RAO, MILTON FINGERMAN, AND CLELMER K. BARTELL dispersion occurs the sum of the average chromatophore stages recorded throughout the experiment for the control group is subtracted from the sum for the experimental group. When pigment concentration occurs the sum for the experimental group is subtracted from the sum of the control group. The differences represent the activity values and constitute a measure of both the intensity and duration of the response. EXPERIMENTS AND RESULTS Rhythm of white pigment migratio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 608 K. RANGA RAO, MILTON FINGERMAN, AND CLELMER K. BARTELL dispersion occurs the sum of the average chromatophore stages recorded throughout the experiment for the control group is subtracted from the sum for the experimental group. When pigment concentration occurs the sum for the experimental group is subtracted from the sum of the control group. The differences represent the activity values and constitute a measure of both the intensity and duration of the response. EXPERIMENTS AND RESULTS Rhythm of white pigment migration This experiment was conducted using a group of crabs delivered to the laboratory on March 21, 1967. On that afternoon 40 intact crabs were placed in a plastic container with a small volume of sea water, about cm. deep. The container was covered with two layers of black cloth to provide darkness for the crabs. Another lot of 40 was selected and distributed 10 each into two white and two black enameled basins which were kept under a constant illumination of meter-candles light intensity. At noon on March 22 the average stage of the white chromatophores of 20 crabs adapted to darkness was determined and the crabs were returned to darkness. The white chromatophores of the crabs on black and white backgrounds were also staged and the crabs returned to their respective backgrounds. This procedure was repeated every four hours through midnight of March 25 and the results are shown in Figure 1. The white pigment of the crabs maintained in constant darkness was more dispersed during the daytime than at night. However, there was no evidence of rhythmical migration of the white pigment of the crabs kept under constant illumination on either background. The white pigment of the crabs on the black background was maximally concentrated while on a white back- bJ (/) u a: O 3 I QL O §> o a: i u I .0—0-0—0. •-•• NOON NOON 12PM. NOON NOON FIGURE 1. Relation
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
