. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERTIDAL GASTROPOD CLUSTERING 175 >' >- *• 4 2min. t . 24min. 56min. 13in. lowering) Cerjthium Distribution and Water Level FIGURE 7. The distribution of a single cluster of Ccrithium in a 12 inch X 14 inch enamel pan of sea water at various times and depths after immersion. other mollusks (Rao, 1954) are, however, suggestive that Cerithium may respond in other ways to the tide cycle than by clustering and aggregation. COMPOSITION OF THE POPULATION The Cerithium population in late 1960 was comprise
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERTIDAL GASTROPOD CLUSTERING 175 >' >- *• 4 2min. t . 24min. 56min. 13in. lowering) Cerjthium Distribution and Water Level FIGURE 7. The distribution of a single cluster of Ccrithium in a 12 inch X 14 inch enamel pan of sea water at various times and depths after immersion. other mollusks (Rao, 1954) are, however, suggestive that Cerithium may respond in other ways to the tide cycle than by clustering and aggregation. COMPOSITION OF THE POPULATION The Cerithium population in late 1960 was comprised chiefly of two varieties of the same species : a dark gray translucently shelled form with a spire of lighter color than the major whorl, and a lighter colored, heavier shelled, less common form with a thickened lip similar in these details to the knobbed cerithium (C. cacrulcnm) of eastern Africa. Intermediates between the two types occur. Size distribution of a cluster of 1377 individuals between 6 and mm. in length is shown in Figure 8. Periodic recruitments to the population, presumably SIZE FREQUENCY IN CERITHIUM CLUSTER Heron Islond XI/9/60. 10 10 11 12 Length in millimeters FIGURE 8. Size distribution within a single cluster of 1377 individuals collected on November 9, 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
