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Table 4.

Track parameters measured from P. americana males walking in a laboratory wind tunnel for wind and odor orientation (Series 2) experiment

Treatment*NNet velocity (cm s–1)Groundspeed (cm s–1)Track angle(deg.)Body yaw(deg.)Track width (cm)Inter-turn duration (s)Stop duration (s)Number of stopsLinearity index
Continuous odor + wind 15 15.9±5.2a 19.5±4.6a 33.5±19.3b 26.2±23.8b 2.8±1.9b 0.4±0.3b 0.1±0.1b 0.5±0.6b 0.8±0.2a 
Odor + wind 16 4.5±4.1b 20.6±15.1a 64.5±18.1a 69.5±36.4a 16.1±9.0a 2.1±1.1a,b 0.2±0.1a 12.6±11.6a 0.3±0.2b 
No odor + wind 16 5.8±6.5b 25.2±9.6a 68.2±22.3a 67.4±28.7a 17.3±11.0a 1.6±0.9b 0.1±0.1a,b 6.1±7.4a,b 0.3±0.3b 
No odor, no wind 15 7.5±18.8a,b 20.5±12.9a 72.1±15.1a 75.0±20.1a 22.6±10.6a 3.3±3.1a 0.2±0.2a 13.4±20.2a 0.2±0.2b 
Treatment*NNet velocity (cm s–1)Groundspeed (cm s–1)Track angle(deg.)Body yaw(deg.)Track width (cm)Inter-turn duration (s)Stop duration (s)Number of stopsLinearity index
Continuous odor + wind 15 15.9±5.2a 19.5±4.6a 33.5±19.3b 26.2±23.8b 2.8±1.9b 0.4±0.3b 0.1±0.1b 0.5±0.6b 0.8±0.2a 
Odor + wind 16 4.5±4.1b 20.6±15.1a 64.5±18.1a 69.5±36.4a 16.1±9.0a 2.1±1.1a,b 0.2±0.1a 12.6±11.6a 0.3±0.2b 
No odor + wind 16 5.8±6.5b 25.2±9.6a 68.2±22.3a 67.4±28.7a 17.3±11.0a 1.6±0.9b 0.1±0.1a,b 6.1±7.4a,b 0.3±0.3b 
No odor, no wind 15 7.5±18.8a,b 20.5±12.9a 72.1±15.1a 75.0±20.1a 22.6±10.6a 3.3±3.1a 0.2±0.2a 13.4±20.2a 0.2±0.2b 

Values are means ± s.d. Values in the same column with the same letters do not differ significantly according to a split-plot ANOVA(P⩽0.05) and post-hoc Tukey's test

*

Treatment prior to the wind being stopped (the wind was not stopped for the continuous odor + wind)

All angles are absolute values of the distributions measured

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