. The Biological bulletin. Biology; Zoology; Marine biology. 454 ANDERSON, LUMER, AND ZUPANCIC Total length was employed as the best available measure of body size. Its use in this way is justified by the fact that there is apparently very little change in the shape of the body during growth (see the preceding section). The standard deviations and coefficients of variation for total length are given in Table I and are plotted against instar number in Fig. 8. It may be noted that both these quantities tend to increase at first, but that after the eighth instar they fall off rather steadily unti
. The Biological bulletin. Biology; Zoology; Marine biology. 454 ANDERSON, LUMER, AND ZUPANCIC Total length was employed as the best available measure of body size. Its use in this way is justified by the fact that there is apparently very little change in the shape of the body during growth (see the preceding section). The standard deviations and coefficients of variation for total length are given in Table I and are plotted against instar number in Fig. 8. It may be noted that both these quantities tend to increase at first, but that after the eighth instar they fall off rather steadily until the seventeenth instar, after which they remain approximately constant. Hence as the growth process reaches com- pletion, body size becomes less variable both absolutely and S 10 INSTAR Fig. 8. Standard deviation and coefficient of variation of total length in relation to instar number. A comparison of the curve for the coefficient of variation with the increment curve (Fig. 4) suggests that these two quantities are corre- lated. When the coefficient of variation is plotted against the loga- rithm of the increment (Fig. 9), the points tend to group themselves along a straight line, indicating that there is roughly a linear relation- ship between the relative variability and the logarithm of the growth rate. Whether or not any general significance can be attached to the precise character of the relationship as indicated here is open to ques- tion ; however, there is no doubt that a distinct relationship exists. These observations are essentially in agreement with those of previous investigators. A trend in the coefficient of variation similar. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Bi
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