Table 1.

Summary statistics of DPIV variables in Triakis semifasciata and Chiloscyllium punctatum holding position at 1.0 Ls-1 and during vertical maneuvering in Triakis semifasciata

Chiloscyllium punctatumTriakis semifasciata
VariableHold, BHold, LRise, RSink, SP-valueSNK
Vertical body velocity (cm s-1)0.39±0.2430.43±0.2962.23±0.632-5.7±1.5300.0004*BLR>S
Body angle (degrees)9±1.63811±0.99519±1.498-3±2.4410.0001*R>BL>S
Path of motion angle (degrees)1.0±0.4480.2±0.4225.7±1.541-11.8±3.2940.0002*R>LB>S
Ring axis angle (degrees)125±4.701120±3.120135±2.881101±7.4310.0011*BLR>S
Jet angle (degrees)-44.5±3.642-38.6±4.190-34.7±5.767-7.1±(3.5380.0010*BLR<S
Tail angle (degrees)163±1.511156±1.140156±1.902154±1.2180.0022*B>LRS
  • These mean values result from using the a priori classification of locomotor behavior into three discrete classes: holding position, rising and sinking.

    Values are means ± S.E.M. for five sequences in each of three individuals (total N=15 for each column).

    L, total body length.

  • * Significant at the Bonferroni corrected P-value of 0.008.

  • Student-Newman-Keuls comparison among behaviors within Triakis semifasciata.