Table 2. Correlations among predictor variables and between predictor variables and maximum prolonged swimming speed, U _max.

a) MPF swimmers
	f	AR	logM	logU max
f		0.25	−0.34	0.28
AR	0.33		0.01	0.8
logM	−0.23	0.39		0.2
logU max	0.34	0.89	0.47

The coefficients are the bivariate Pearson product-moment correlation among raw variables (below diagonal) and phylogenetically independent contrasts (above diagonal). The predictor variables are f (body fineness ratio), AR (propulsive fin aspect-ratio), and logM (body mass).