Table 1.
Mean values for kinematic and performance metrics for the jellyfish Aurelia aurita in the presence or absence of a stopping vortex underneath the animal.
| parameter | stopping vortex absent | n | stopping vortex present | n | p value |
|---|---|---|---|---|---|
| bell margin speed | 56.3 (s.d. 4.2) mm s−1 | 6 | 58.7 (s.d. 4.4) mm s−1 | 8 | 0.439 |
| bell fineness at peak contraction | 0.549 (s.d. 0.05) | 6 | 0.562 (s.d. 0.04) | 8 | 0.677 |
| contraction duration | 441.7 (s.d. 7.5) ms | 6 | 428.3 (s.d. 17.2) s | 8 | 0.179 |
| total displacement | 7.9 (s.d. 1.9) mm | 5 | 12.7 (s.d. 1.5) mm | 7 | *0.007 |
| maximum swimming speed | 18.2 (s.d. 1.5) mm s−1 | 6 | 25.7 (s.d. 0.9) mm s−1 | 8 | *<0.001 |
| maximum negative pressure | −0.34 (s.d. −0.11) Pa | 5 | −0.51 (s.d. 0.12) Pa | 6 | 0.120 |
| maximum positive pressure | 0.32 (s.d. 0.09) Pa | 5 | 0.74 (s.d. 0.08) Pa | 6 | *<0.001 |