Table 2 . Regression parameters for the major morphometric comparisons of Solenopsis invicta. All variables were regressed as logarithms of ratios in the form log y= b+a[log (x/y)]. Slopes that are significantly different from zero indicate that the ratio (size-free shape) changes with the size of the whole body or body part. Abbreviations as in Table 1.

Line No. Dimension 1 (x-axis) Dimension 2 (y- axis) Log slope t-value d.f. p-value R2 1 BL HL/BL -0.013 -0.98 48 n.s. --- 2 BL HW1/BL 0.15 6.49 48 <0.0001 45% 3 BL HW2/BL 0.27 9.68 48 <0.0001 65% 4 BL HW3/BL 0.058 1.87 50 n.s. --- 5 BL HW1/HW3 0.096 4.93 50 <0.0001 31% 6 BL HW2/HW3 0.20 7.43 50 <0.0001 52% 7 HL HW2/HL 0.35 11.6 49 <0.0001 72% 8 BL HW2/HL 0.33 13.2 49 <0.0001 78% 9 BL ML/HW2 -0.16 -2.83 21 <0.01 24% 10 BL ML/HW3 0.032 0.61 21 n.s. --- 11 BL ANT/BL -0.30 -16.1 48 <0.0001 84% 12 AN SC/AN 0.027 0.91 48 n.s. --- 13 AN FL/AN -0.017 -0.77 48 n.s. --- 14 AN CL/AN -0.17 -3.46 48 <0.005 18% 15 BL SC/BL -0.27 -10.8 49 <0.0001 70% 16 BL FL*/BL -0.26 -3.72 50 <0.0005 20% 17 BL CL/BL -0.43 -10.9 50 <0.0001 70% 18 BL LG1/BL -0.034 -1.77 124 n.s. --- 19 BL LG2/BL -0.016 -0.82 124 n.s. --- 20 BL LG3/BL -0.015 -0.49 124 n.s. --- 21 L3 FE3/LG3 -0.071 -2.85 48 <0.01 13% 22 L3 TB3/LG3 0.049 1.58 47 n.s. --- 23 L3 TA3/LG3 0.04 1.56 49 n.s. --- 24 BL HL/BL -0.013 -0.97 123 n.s. --- 25 BL AL/BL -0.06 -3.56 123 <0.001 8.5% 26 BL GL/BL 0.17 8.06 125 <0.0001 34% 27 BL AH/BL 0.14 2.51 125 <0.05 4% 28 GL GW/GL 1.17 2.54 50 <0.05 10% 29 BL GW/BL 0.31 11.6 48 <0.0001 73%