. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SPAWNING AND DEVELOPMENT IN TR1DACNA 221 zooxanthellae was typically 11-15 days. However, there was wide variation in the times of development (see Table IV). Metamorphosis occurred in some clams as late as day 30. Clams without zooxanthellae metamorphosed at the same times as those with zooxanthellae. Mortality was high for all groups of clams, regardless of strain of zooxanthellae. Less than 5% of the veligers alive on day 3 survived through to complete metamorphosis, regardless of the experimental conditions. No zooxanthe
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SPAWNING AND DEVELOPMENT IN TR1DACNA 221 zooxanthellae was typically 11-15 days. However, there was wide variation in the times of development (see Table IV). Metamorphosis occurred in some clams as late as day 30. Clams without zooxanthellae metamorphosed at the same times as those with zooxanthellae. Mortality was high for all groups of clams, regardless of strain of zooxanthellae. Less than 5% of the veligers alive on day 3 survived through to complete metamorphosis, regardless of the experimental conditions. No zooxanthellae were seen in the mantle region of newly metamorphosed clams (Fig. 6), in spite of the fact that zooxanthellae were common in the stomachs of 100 75 cr D (/> 50 UJ O cr LLI Q. 25. Aiptasia pallida Cassiopeia xamachana \X Zoanthus solanderi <4 Tridacna gigas & Tridacna maxima --- D A Zoanthus sociatus" Q Aiptasia tagetes O without algae 7 8 9 10 AGE (DAYS) FIGURE 5. Percent survival of veligers of T. squamosa over 7 days in Petri dishes containing zooxanthellae isolated from the various hosts indicated on the right of each line. The experiment was terminated on day 11, when metamorphosis began. * = strain "Z", ** = strain "U".. 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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