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Table 1.

Path kinematics in real and simulated crabs in three different downstream plume regions

Velocity (cm s-1) in plume regionCenterline displacement (cm) in plume region
100-66 cm66-33 cm33-0 cm100-66 cm66-33 cm33-0 cm
Simulations (0.7) 14.3±0.05 14.4±0.05 14.5±0.06 2.55±0.32 2.31±0.21 0.64±0.08 
Simulations (0.5) 6.79±0.30 6.73±0.34 6.08±0.23 2.94±0.25 1.83±0.19 0.72±0.54 
Real crabs 7.21±0.82 7.26±0.91 5.52±0.73 6.29±1.33 4.85±0.79 3.34±0.32 
Velocity (cm s-1) in plume regionCenterline displacement (cm) in plume region
100-66 cm66-33 cm33-0 cm100-66 cm66-33 cm33-0 cm
Simulations (0.7) 14.3±0.05 14.4±0.05 14.5±0.06 2.55±0.32 2.31±0.21 0.64±0.08 
Simulations (0.5) 6.79±0.30 6.73±0.34 6.08±0.23 2.94±0.25 1.83±0.19 0.72±0.54 
Real crabs 7.21±0.82 7.26±0.91 5.52±0.73 6.29±1.33 4.85±0.79 3.34±0.32 

Weightings in the simulations are given in parentheses.

Mean movement velocity and distance from centerline are shown in three plume regions characterized by their downstream distance from the source.

Values are means ± S.E.M. (N=14 paths for each treatment).

Repeated-measures design analysis indicates that movement rate is significantly different in the three regions for real but not for simulated searchers (F2,26=4.70, P<0.05; F2,26<2.07, P>0.05, for real and both simulation groups, respectively).

Movement velocity in real crabs declined linearly as a function of distance category (F1,13=6.07, P<0.05).

Centerline displacement (absolute distance) was significantly different in all groups (F2,26>5.17, P<0.05 for all groups) and was a linear function of distance category(F1,13=5.74, P<0.05 for all groups).

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