. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENTS OF STYLOCHUS 151 determined by noting the length of time needed for each worm to move 40 mm., with- out stopping, in a straight line. The average righting time at 20°, 25° and 30° C. was fairly constant at 7 to 9 seconds, but increased to 17 seconds at ° C. and remained at approximately this level at temperatures down to and including ° C. At 10° C. righting time in- creased to 30 seconds and rose sharply to 116 seconds at ° C. (Fig. 2). The average locomotion rate varied somewhat erratically at differen
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MOVEMENTS OF STYLOCHUS 151 determined by noting the length of time needed for each worm to move 40 mm., with- out stopping, in a straight line. The average righting time at 20°, 25° and 30° C. was fairly constant at 7 to 9 seconds, but increased to 17 seconds at ° C. and remained at approximately this level at temperatures down to and including ° C. At 10° C. righting time in- creased to 30 seconds and rose sharply to 116 seconds at ° C. (Fig. 2). The average locomotion rate varied somewhat erratically at different tem- peratures, but tended to decrease with decreasing temperature. From a rate of over 50 millimeters per minute at 20° C. and higher it dropped to approximately 10 at ° C. (Fig. 3). A comparison of average locomotion rates ob- served in this experiment with similar data reported by Pearse and Wharton (1938) for 5\ cllipticus from Apalachicola Bay showed that, at the same temperatures loco- motion rates of Milford Harbor worms were consistently higher than those of Florida worms (Fig. 4). This difference may indicate the existence of physiological races within this species of flatworm. 120 100 80 01 o z o o UJ C/) UJ 5 \- 60 40 20. j_ 10 15 SALINITY IN 20 25 30 PPT FIGURE 5. Average righting time of Stylochus ellipticus from Milford Harbor, Conn, at different salinities and 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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