. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UJ CO .5 H- S. MHWN MLWN TIDAL HEIGHT FIGURE 4. Settlement density of Chthamalus in numbers per cm2 in Semibalanus removals. Means and standard deviations from 5 to 10 replicate counts of 4 cm X 4 cm quadrats are reported as a function of tidal height. Symbols and locations are as in Figure 1. on the opercular valves of adjacent Semibalanus individuals. In sites where Semi- balanus settlement was less intense (shore sites used for Figs. 2 and 3), Semibalanus had not yet overgrown Chthamalus but were likely to do so by Ju
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. UJ CO .5 H- S. MHWN MLWN TIDAL HEIGHT FIGURE 4. Settlement density of Chthamalus in numbers per cm2 in Semibalanus removals. Means and standard deviations from 5 to 10 replicate counts of 4 cm X 4 cm quadrats are reported as a function of tidal height. Symbols and locations are as in Figure 1. on the opercular valves of adjacent Semibalanus individuals. In sites where Semi- balanus settlement was less intense (shore sites used for Figs. 2 and 3), Semibalanus had not yet overgrown Chthamalus but were likely to do so by June or July. These results indicate that Chthamalus is capable of settlement and survival for at least 8 months (August through April) at mid-tide level in the absence of Semiba- lanus. Postsettlement mortality as a result of competition with Semibalanus is the most likely mechanism causing the restriction of Chthamalus to the high shore. Although Chthamalus settles most heavily in the mid-shore, it survives only in its refuge from competition high on the shore, where Semibalanus is restricted by desiccation. Postsettlement mortality of Chthamalus is likely to be very intense in spring when Semibalanus settlement occurs, thereby smothering 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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