. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SHELL SIZE AS INDEX OF AGE IN APLYSIA 343 to >s o Q_ o O 0 320r 280 240 200 160 120 80 40 (28). (9) (8) (10) I 0 20 40 60 80 Shell Diameter (MSD)-mm FIGURE 5. Determination of postmetamorphic age (PMA) based upon the equation given in text (see Discussion). The relationship in the equation is entirely independent of body weight. Numbers in parentheses are the number of determinations for each point plotted; standard error given for each shell size. age (PMA) of Aplysia: PMA = MSP - SDMM RSG where MSD is the maximum shell
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SHELL SIZE AS INDEX OF AGE IN APLYSIA 343 to >s o Q_ o O 0 320r 280 240 200 160 120 80 40 (28). (9) (8) (10) I 0 20 40 60 80 Shell Diameter (MSD)-mm FIGURE 5. Determination of postmetamorphic age (PMA) based upon the equation given in text (see Discussion). The relationship in the equation is entirely independent of body weight. Numbers in parentheses are the number of determinations for each point plotted; standard error given for each shell size. age (PMA) of Aplysia: PMA = MSP - SDMM RSG where MSD is the maximum shell diameter (see Fig. 5); SDMM is the shell diameter at metamorphosis, mm (see Kriegstein, 1977; Switzer-Dunlap and Hadfield, 1977); RSG is the rate of shell growth (See Table II). The PMA of the smallest animals described above is mm — mm mm/day = 18 days This age compares favorably with that of animals whose birthdate was known, 17 days after metamorphosis, as described by Kriegstein (1977, Table I). It is now possible to determine the PMA of the age groups studied previously (Papkaetal., 1981; Rattan and Peretz, 1981;Peretzef al., 1982), using the equation above or Figure 5. Young animals have an average shell diameter of ± mm (n = 24), with body weights from 2 to 20 g. Mature animals have an average shell diameter of ± mm (n = 92), with body weights from 100 to 250 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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