. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF BARNACLES 247 respond. When the cyprid density was high, thus providing more organisms which would by random selection be subjected to the contrast of luminous zone and dark area, the greatest change in cyprid attachment occurred when the illumination of the water surface was changed from to footcandle. At footcandle and greater intensities, the difference in cyprid settling, in comparison to the controls, was sevenfold, while at footcandle and less, the increase over the control col- -10260. -
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ATTACHMENT OF BARNACLES 247 respond. When the cyprid density was high, thus providing more organisms which would by random selection be subjected to the contrast of luminous zone and dark area, the greatest change in cyprid attachment occurred when the illumination of the water surface was changed from to footcandle. At footcandle and greater intensities, the difference in cyprid settling, in comparison to the controls, was sevenfold, while at footcandle and less, the increase over the control col- -10260. - I 0250 -10240 10230 CO UJ Q 7 3O 8 30 1130 I 30 3 30 5 30 730 800 100012 00200400 600 800 10001200 200400 600 AM PMAM PMAM P M FEB 15 MARCH 7 MARCH 8 FIGURE 4. Bi-hourly cyprid attachment at each station totaled from the four collecting surfaces. The height of tide is noted in decimeter units. February 15, March 7 and 8, 1946. lectors was only twofold. However, at illumination as low as .03 footcandle, in- creases in attachment over control collectors were still considerable. Previous investigations (Visscher, 1927; Pomerat and Reiner, 1942; and McDougall, 1943) showed that the barnacle cyprid attaches in daylight in greater numbers to dark surfaces than to light surfaces. At night, as is to be expected, there is no distinction between the two colors. In this investigation illumination of dark collecting surfaces at night increased attachment. One effect of illumination. 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
