Table 4 Differences in size and mass between right and left bones of forelimbs in 23 walruses (Odobenus rosmarus).
From: Feeding behaviour of free-ranging walruses with notes on apparent dextrality of flipper use
All specimens (n = 23) | Average of differences, ∑ (R-L)/n (mm or g) | Average of differences in % of bone length or mass ∑ ((R-L)/L*100)/n | % R > L;R = L; R < L | Significance of difference (Wilcoxon signed rank test) |
|---|---|---|---|---|
Scapula length (n = 22) | 2.63 | 1.08 | 64% 18% 18% | 0.005* |
Scapula height (n = 22) | 0.18 | -0.02 | 41% 27% 32% | 0.68 |
Humerus length (n = 21) | 1.00 | 0.64 | 52% 43% 5% | 0.004* |
Radius length (n = 23) | 0.39 | 0.29 | 39% 39% 22% | 0.29 |
Ulna length (n = 21) | 1.38 | 0.62 | 62% 29% 9% | 0.02* |
Scapula mass (n = 19) | 2.05 | 0.66 | 37% 10% 53% | 0.67 |
Humerus mass (n = 17) | 5.06 | 1.08 | 71% 5% 24% | 0.09 |
Radius mass (n = 20) | -0.10 | 1.14 | 50% 30% 20% | 0.44 |
Ulna mass (n = 21) | 1.76 | 0.45 | 38% 33% 29% | 0.55 |