. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 192 WHEELER J. NORTH TABLE II Summary of an experiment to determine the time required for Littorina to cycle food completely through the gut; May 18, 1953; water temperature range 17° to 30° C.; 20 snails per size group Species I [fight cm. Time elapsed until First blue fecal pellet observed, hr. Half of group defecated blue feces. hr. Entire group defecated blue feces, hr. L. f>lanaxis L. planaxis L. planaxis If 2 2| 2 3! ^ 3 5 _* L. sciitulata L. sciitulata 1! 2| 1 4 3 5 * Thir
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 192 WHEELER J. NORTH TABLE II Summary of an experiment to determine the time required for Littorina to cycle food completely through the gut; May 18, 1953; water temperature range 17° to 30° C.; 20 snails per size group Species I [fight cm. Time elapsed until First blue fecal pellet observed, hr. Half of group defecated blue feces. hr. Entire group defecated blue feces, hr. L. f>lanaxis L. planaxis L. planaxis If 2 2| 2 3! ^ 3 5 _* L. sciitulata L. sciitulata 1! 2| 1 4 3 5 * Thirteen had defecated blue feces after 1\ hours. group were generally at least partially full hut sometimes almost empty. It was concluded that animals in the pools graze sufficiently to keep the gut full at all times. Snails feeding on areas that become dry at low tide appear to graze only when the surface is moist, and the amount of material in the gut consequently is variable. In order to determine the rate at which material is passed through the gut, groups of snails were allowed to graze on a section of Shelf Rock the. 2 + Weight of sand in the gut, mg o.'s Height of snail, cm FIGURE 5. Relationship of sand contained in the gut to height of Littorina 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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