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Table 2.

Track parameters measured from P. americana males walking in a laboratory wind tunnel from the Series 1 experiment

TreatmentNNet velocity (cm s–1)Ground speed (cm s–1)Track angle*(deg.)Body yaw angle*(deg.)Track width (cm)Inter-turn duration (s)Number of stopsStop duration (s)Linearity index
WP beg 14 18.9±11.0a,b 21.2±9.9a 30.9±23.9b,c 23.1±25.8b 2.8±2.2b,c 0.4±0.3b 0.4±0.6a 0.04±0.06a 0.7±0.3a,b 
WP end 14 17.6±7.2a,b 24.9±8.1a 37.0±20.4b 24.1±15.2b 3.9±3.3b,c 0.5±0.4b 0.8±1.6a 0.04±0.08a 0.7±0.2b 
Pre-WS 16 21.4±10.0a,b 21.7±8.6a 21.3±9.3b,c 15.7±7.9b 2.1±1.3c 0.3±0.1b 0.2±0.5a 0.01±0.04a 0.8±0.1a,b 
Post-WS 16 23.4±19.3a 24.8±6.5a 36.8±19.5b 26.3±21.0b 5.8±4.6b 0.6±0.4b 0.9±1.8a 0.05±0.07a 0.8±0.2a,b 
Pre-PP 17 21.1±5.4a,b 22.8±5.4a 20.2±8.1c 15.3±3.9b 2.4±2.6b,c 0.4±0.5b 0.6±0.2a 0.02±0.08a 0.9±0.0a 
Post-PP 17 8.6±19.9b 27.7±6.1a 95.1±11.9a 92.8±27.3a 14.9±5.9a 1.2±0.4a 0.8±1.1a 0.04±0.05a 0.2±0.1c 
TreatmentNNet velocity (cm s–1)Ground speed (cm s–1)Track angle*(deg.)Body yaw angle*(deg.)Track width (cm)Inter-turn duration (s)Number of stopsStop duration (s)Linearity index
WP beg 14 18.9±11.0a,b 21.2±9.9a 30.9±23.9b,c 23.1±25.8b 2.8±2.2b,c 0.4±0.3b 0.4±0.6a 0.04±0.06a 0.7±0.3a,b 
WP end 14 17.6±7.2a,b 24.9±8.1a 37.0±20.4b 24.1±15.2b 3.9±3.3b,c 0.5±0.4b 0.8±1.6a 0.04±0.08a 0.7±0.2b 
Pre-WS 16 21.4±10.0a,b 21.7±8.6a 21.3±9.3b,c 15.7±7.9b 2.1±1.3c 0.3±0.1b 0.2±0.5a 0.01±0.04a 0.8±0.1a,b 
Post-WS 16 23.4±19.3a 24.8±6.5a 36.8±19.5b 26.3±21.0b 5.8±4.6b 0.6±0.4b 0.9±1.8a 0.05±0.07a 0.8±0.2a,b 
Pre-PP 17 21.1±5.4a,b 22.8±5.4a 20.2±8.1c 15.3±3.9b 2.4±2.6b,c 0.4±0.5b 0.6±0.2a 0.02±0.08a 0.9±0.0a 
Post-PP 17 8.6±19.9b 27.7±6.1a 95.1±11.9a 92.8±27.3a 14.9±5.9a 1.2±0.4a 0.8±1.1a 0.04±0.05a 0.2±0.1c 

Each treatment was split into two sections: wind and plume tracking beginning and end (WP beg, WP end), pre- and post-plume pull (Pre-PP,Post-PP), and pre- and post-wind stop (Pre-WS, Post-WS)

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

*

All angles are absolute values of the distributions measured

Linearity index range = 0.0–1.0, with 1.0 = straight line from release point to source

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