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Table 1.

Distinguishing features of successful vs unsuccessful strikes

Successful strike in water columnUnsuccessful strikeSuccessful strike on substrate
Accuracy index 0.45±0.07 –0.26±0.09 0.61±0.12 
Normalized Ax 0.24±0.08 0.43±0.09 0.21±0.13 
Normalized Ay 0.24±0.06 0.36±0.08 0.06±0.10 
Aspect ratio 0.75±0.15 0.74±0.14 0.23±0.07 
N 16 11 
Successful strike in water columnUnsuccessful strikeSuccessful strike on substrate
Accuracy index 0.45±0.07 –0.26±0.09 0.61±0.12 
Normalized Ax 0.24±0.08 0.43±0.09 0.21±0.13 
Normalized Ay 0.24±0.06 0.36±0.08 0.06±0.10 
Aspect ratio 0.75±0.15 0.74±0.14 0.23±0.07 
N 16 11 

Values are means ± s.e.m. for total accuracy index, one-dimensional accuracy indices (Ax and Ay) and aspect ratio of the ingested volume for three behaviours: successful strikes in the water column, unsuccessful strikes and successful strikes on the substrate. All variables are dimensionless. N, the sample size in each group

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