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Table 1.

Means of 23 statistical variables digitized from the kinematic profiles of Chelus fimbriatus feeding on fish

Variable
Mean velocity of stalking (cm s-10.36±0.30 
Time between start of gape and start of approach (ms) 5.94±1.89 
Mean velocity of forward thrust of head (cm s-170.47±15.81 
Maximum velocity of forward thrust of head (cm s-1177.97±48.64 
Gape cycle duration (ms) 83.35±19.90 
Time to maximum gape (ms) 20.30±4.59 
Mean velocity of gape (cm s-175.46±14.96 
Maximum velocity of gape (cm s-1151.15±40.72 
Mean velocity of mouth closure (cm s-125.46±8.13 
Maximum velocity of mouth closure (cm s-188.46±33.30 
Delay between start of hyoid depression and maximum gape (ms) 11.10±2.77 
Delay between maximum hyoid depression and maximum gape (ms) 46.55±10.78 
Time to maximum hyoid depression (ms) 54.00±10.92 
Mean velocity of hyoid depression (cm s-129.70±6.59 
Maximum velocity of hyoid depression (cm s-193.93±27.24 
Mean velocity of prey (suction) (cm s-1144.33±70.30 
Maximum velocity of prey (suction) (cm s-1282.59±166.76 
Delay between start of oesophageal distension and hyoid depression (ms) 6.50±3.36 
Duration of oesophageal distension (ms) 1340.00±219.10 
Time to first peak of oesophageal distension (ms) 43.95±9.25 
Duration of distension (ms) 218.90±85.14 
Mean velocity of oesophageal distension (cm s-139.40±11.63 
Maximum velocity of oesophageal distension (cm s-1103.48±28.07 
Ram-suction index +0.36±0.23 
Variable
Mean velocity of stalking (cm s-10.36±0.30 
Time between start of gape and start of approach (ms) 5.94±1.89 
Mean velocity of forward thrust of head (cm s-170.47±15.81 
Maximum velocity of forward thrust of head (cm s-1177.97±48.64 
Gape cycle duration (ms) 83.35±19.90 
Time to maximum gape (ms) 20.30±4.59 
Mean velocity of gape (cm s-175.46±14.96 
Maximum velocity of gape (cm s-1151.15±40.72 
Mean velocity of mouth closure (cm s-125.46±8.13 
Maximum velocity of mouth closure (cm s-188.46±33.30 
Delay between start of hyoid depression and maximum gape (ms) 11.10±2.77 
Delay between maximum hyoid depression and maximum gape (ms) 46.55±10.78 
Time to maximum hyoid depression (ms) 54.00±10.92 
Mean velocity of hyoid depression (cm s-129.70±6.59 
Maximum velocity of hyoid depression (cm s-193.93±27.24 
Mean velocity of prey (suction) (cm s-1144.33±70.30 
Maximum velocity of prey (suction) (cm s-1282.59±166.76 
Delay between start of oesophageal distension and hyoid depression (ms) 6.50±3.36 
Duration of oesophageal distension (ms) 1340.00±219.10 
Time to first peak of oesophageal distension (ms) 43.95±9.25 
Duration of distension (ms) 218.90±85.14 
Mean velocity of oesophageal distension (cm s-139.40±11.63 
Maximum velocity of oesophageal distension (cm s-1103.48±28.07 
Ram-suction index +0.36±0.23 

Values are means ± S.D. (N=20).

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