. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 46 L. R. McEDWARD AND K. H. MORGAN Table 7 tur the 22 species of echinodenns with feeding larvae, including Clypeaster roseaceus Model b c k Fit AX predict Y Linear — — [[ ] [>100%] Power [] [] Allometric [] [] [] [>100%] Polynomial [] [] [—] Regression parameters are illustrated for each model in Table 2. Fit is
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 46 L. R. McEDWARD AND K. H. MORGAN Table 7 tur the 22 species of echinodenns with feeding larvae, including Clypeaster roseaceus Model b c k Fit AX predict Y Linear — — [[ ] [>100%] Power [] [] Allometric [] [] [] [>100%] Polynomial [] [] [—] Regression parameters are illustrated for each model in Table 2. Fit is the proportion of the total variance in egg energy content that is explained by the regression against egg volume. AX predict Y gives the minimum difference in egg volume needed to yield significantly different predictions of egg energy content. subsets of planktotrophic species that we analyzed. Like- wise, the coefficient of the second-order term of the poly- nomial regression varied from positive (upward curvature) to negative (downward curvature), but the 95% confidence interval for that parameter ranged from positive to negative for most analyses. The behavior of these models indicates that there is not a clear scaling trend among species with feeding larvae. This is consistent with the growing appre- ciation that planktotrophic species utilize a wide range of nutritional strategies and are characterized by different life history trade-offs across those strategies (Herrera et 1996; McEdward and Janies, 1997; McEdward, 1997). At this point, with existing data, it is not possible to character- ize the scaling relationships between egg size and energy content, and it is certainly impossible to use regression analysis to predict energy content from measurements of egg volume. Data on additional planktotrophic species might provide a clear picture of how egg energy scales with volume. However, it is also possible that energetic diversity among planktotrophs is cons
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