. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE DEPENDENCE OF CLEAVAGES 109 with temperature, each cleavage rate is represented by the product of the temperature-dependent term and the cleavage rate at a standard temperature, which is a con- stant that differs between cleavages. The logarithm of this product is thus the sum of the logarithm of the term representing the temperature dependence and the loga- rithm of the constant. So, if all terms of the temperature dependence are equal to one another from one cleavage cycle to the next, all curves as a function
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. TEMPERATURE DEPENDENCE OF CLEAVAGES 109 with temperature, each cleavage rate is represented by the product of the temperature-dependent term and the cleavage rate at a standard temperature, which is a con- stant that differs between cleavages. The logarithm of this product is thus the sum of the logarithm of the term representing the temperature dependence and the loga- rithm of the constant. So, if all terms of the temperature dependence are equal to one another from one cleavage cycle to the next, all curves as a function of temperature will have the same shape with different ordinate inter- cepts. To further examine the temperature dependence of cleavage cycles, the same data used in Figure 1 are replot- ted in Figure 2. As seen in the figure, u3 has a linear relation to u:. with the straight line passing through the 200 - a 150- 3, u OJ DC cd u "E •= loo — 50- 0-. °C ^ I I 0 50 100 Length of the second cleavage cycle (u,) (mini Figure 2. The data in Figure 1 plotted to show the relation between cleavage cycles at various temperatures. The abscissa is the mean length of the second cleavage cycle, and the ordinate is the mean length of the first or third cleavage cycles. Error bars show 99% confidence inter- vals of the averages. The error bars for u: were omitted for clarity in this figure (the magnitude of error bars for u: is similar to the magnitude of error bars for u,). Each straight line was obtained by at least-squares method applied to the data points for u, or u,, using the squares of SEM for both variables as the variances (Awaya. 1983). The ordinate intercept of the line is min for u, and min for u,. origin; its slope is The ordinate intercept is not sig- nificantly different from zero (P = ). This relation shows that the temperature dependence of u: is equal to that of u,, since the lengths of two cleavage cycles should be in d
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
