. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 496 TOM M. SPIGHT QQ 0 UJ cr UJ CO. 10 - 0 0 SHELL LENGTH (mm) FIGURE 3. Effect of crowding on sizes reached by embryos of Thais emarginata. Capsules in A contain 17-23 embryos; capsules in B contain 14-16 embryos; capsules in C contain 6-11 embryos; and capsules in D contain 1-4 embryos (and excess nurse eggs). In a capsule con- taining four embryos, one embryo reached mm ; its size is not plotted. such capsules are highly correlated (r-, ) with the number of embryos (X), indicating that all embryos eat
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 496 TOM M. SPIGHT QQ 0 UJ cr UJ CO. 10 - 0 0 SHELL LENGTH (mm) FIGURE 3. Effect of crowding on sizes reached by embryos of Thais emarginata. Capsules in A contain 17-23 embryos; capsules in B contain 14-16 embryos; capsules in C contain 6-11 embryos; and capsules in D contain 1-4 embryos (and excess nurse eggs). In a capsule con- taining four embryos, one embryo reached mm ; its size is not plotted. such capsules are highly correlated (r-, ) with the number of embryos (X), indicating that all embryos eat about the same number of nurse eggs when nurse eggs are present in excess. With the relationship between these variables, Y = + , it can be shown that the nurse egg supplies of the smallest capsules can be consumed by only four embryos, and six embryos can consume the supplies found in the largest capsules. Since nurse egg supplies vary less from capsule to capsule than embryo counts, a typical embryo's nurse-egg ration will be more closely related to the number of capsulemates than to capsule size. In the capsule sample available, embryo sizes (Y, mean of the logarithms of shell lengths in mm) are highly correlated (r is ) with embryo counts (number per capsule, X). The linear regression be- tween these variables is Y • - — X, for twelve capsules. Embryo size distributions, as well as mean sizes, change regularly as the num- ber of embryos per capsule decreases (Fig. 3). When 17-23 embryos share a capsule, the distribution is sharply curtailed to the right and has a small tail to. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
