The Company of Biologists

Table 4.

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

Treatment^{^*}	N	Net 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 stops	Linearity index
Continuous odor + wind	15	15.9±5.2^a	19.5±4.6^a	33.5±19.3^b	26.2±23.8^b	2.8±1.9^b	0.4±0.3^b	0.1±0.1^b	0.5±0.6^b	0.8±0.2^a
Odor + wind	16	4.5±4.1^b	20.6±15.1^a	64.5±18.1^a	69.5±36.4^a	16.1±9.0^a	2.1±1.1^a,b	0.2±0.1^a	12.6±11.6^a	0.3±0.2^b
No odor + wind	16	5.8±6.5^b	25.2±9.6^a	68.2±22.3^a	67.4±28.7^a	17.3±11.0^a	1.6±0.9^b	0.1±0.1^a,b	6.1±7.4^a,b	0.3±0.3^b
No odor, no wind	15	7.5±18.8^a,b	20.5±12.9^a	72.1±15.1^a	75.0±20.1^a	22.6±10.6^a	3.3±3.1^a	0.2±0.2^a	13.4±20.2^a	0.2±0.2^b

Treatment^{^*}	N	Net 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 stops	Linearity index
Continuous odor + wind	15	15.9±5.2^a	19.5±4.6^a	33.5±19.3^b	26.2±23.8^b	2.8±1.9^b	0.4±0.3^b	0.1±0.1^b	0.5±0.6^b	0.8±0.2^a
Odor + wind	16	4.5±4.1^b	20.6±15.1^a	64.5±18.1^a	69.5±36.4^a	16.1±9.0^a	2.1±1.1^a,b	0.2±0.1^a	12.6±11.6^a	0.3±0.2^b
No odor + wind	16	5.8±6.5^b	25.2±9.6^a	68.2±22.3^a	67.4±28.7^a	17.3±11.0^a	1.6±0.9^b	0.1±0.1^a,b	6.1±7.4^a,b	0.3±0.3^b
No odor, no wind	15	7.5±18.8^a,b	20.5±12.9^a	72.1±15.1^a	75.0±20.1^a	22.6±10.6^a	3.3±3.1^a	0.2±0.2^a	13.4±20.2^a	0.2±0.2^b

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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