. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING REGULATION IN TADPOLES 223 Buccal volume as a function of individual size The apparent buccal volume (BV: volume cleared/pump stroke) for Xenopus larvae was larger than that for comparably sized Rana larvae (Fig. 2). An analysis of covariance, using individual snout-vent length (SV) as the covariate, indicated that the Xenopus larvae had larger apparent buccal volumes than did the Rana larvae, over all size classes examined (F = ; P = ). A double-logarithmic transformation of the data indicates that log SV
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING REGULATION IN TADPOLES 223 Buccal volume as a function of individual size The apparent buccal volume (BV: volume cleared/pump stroke) for Xenopus larvae was larger than that for comparably sized Rana larvae (Fig. 2). An analysis of covariance, using individual snout-vent length (SV) as the covariate, indicated that the Xenopus larvae had larger apparent buccal volumes than did the Rana larvae, over all size classes examined (F = ; P = ). A double-logarithmic transformation of the data indicates that log SV vs log BV are linearly related (Fig. 3). Therefore, the relationship between SV and BV could be fitted to a power function for cohorts of both X. laevis and R. sphenocephala. Using nonlinear regres- sion (after Zar, 1968), the parameters in the power function were: Xenopus BV = (±) SK' ). The estimates of the exponents for both species was less than 3, indicating negative allometry (Huxley, 1932, 1950). k- o _S? O O > O Xen opus Rana A A AA SNOUT-VENT LENGTH (cm) FIGURE 3. Apparent buccal volumes (BV) of A", laevis and R. sphenocophala larvae, as functions of individual sizes, measured by snout-vent lengths (SV). This double-logarithmic transformation of the data indicates that the relationships can be described by power function (BV = aSF*5), with b < 3, suggesting negative 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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