Treatment	Species	No. trials	No. flies coloured that mated	p-value	No. flies gassed that mated	p-value
Collection on CO2	D. mel	73	36	1	27	0.0344
D. pse	79	41	0.8221	44	0.3682
D. sub	71	40	0.3425	33	0.6353
Exposed to CO2 18 hrs prior	D. mel	57	28	1	19	0.0163
D. pse	65	32	1	31	0.8043
D. sub	68	38	0.3961	35	0.9036
Exposed to CO2 2days.	D. mel	56	19	0.0222	32	0.3497
D. pse	70	32	0.5504	33	0.7202
D. sub	56	29	0.8939	26	0.6889