. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 77 - a •s. en Q. - Portobelo. \ 6 I 7 45678 Polyp diameter (mm) FIGURE 2. (Left) Proportion of colonies with large polyps (L) and with small polyps (S) found expanded in each of five different depth zones. Values based on transects from the San Bias Islands and Bocas del Toro regions of Panama. Values in parenthesis indicate numbers of colonies used to derive each data point, and roughly correspond to the colonies' relative abundances at the different depths. FIGURE 3. (Right) Least squares regressions of polyp size
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 77 - a •s. en Q. - Portobelo. \ 6 I 7 45678 Polyp diameter (mm) FIGURE 2. (Left) Proportion of colonies with large polyps (L) and with small polyps (S) found expanded in each of five different depth zones. Values based on transects from the San Bias Islands and Bocas del Toro regions of Panama. Values in parenthesis indicate numbers of colonies used to derive each data point, and roughly correspond to the colonies' relative abundances at the different depths. FIGURE 3. (Right) Least squares regressions of polyp size on polyp density at 8 and 20 m depth from Portobelo. Mean diameter of polyps from the two populations do not differ, but polyp density of the deep population (20 m) is significantly lower than that of the shallow population (8 m) (p < , ANOVA). area is an index of biomass per unit area and accounts for much of the variance in the respiration rates. The importance of polyp size and number was again evident when data on whole colony respiration rates were analyzed. Linear regressions were determined between respiration and two measures of colony size: RT= +, r2 = (1) RT= + , r2 = , (2) where RT is total respiration (jug O2/h), A is total colony surface area (cm2), and Ap is area of the polyps (cm2). A greater portion of variance in respiration rates is explained by (2), which uses the area of the polyps as an estimator of biomass. The solution of (2) was calculated in a stepwise linear regression procedure which considered, but rejected as insignificant, the effects of coenosarc area. This does not necessarily mean coensarc makes no contribution to respiration rate. Coe- nosarc and polyp areas among the 18 colonies were correlated (r = , p < ), and the covariance between the areas of the two makes it difficult to discuss whether the two actually make an independent contribution to respi- ration. As a consequence of the correla
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
