Table 2 Estimates of degree of mate choice by males and females of the rice (R) and water-oat (W) populations of Chilo suppressalis in mate choice tests after altering the photoperiod of one population to more closely synchronize its mating activity with that of the other.

Mating situation	PTI	Value	SD	P
No choice	PTI_RR	0.91	0.12	0.436
	PTI_RW	0.89	0.12	0.329
	PTI_WR	1.04	0.13	0.810
	PTI_WW	1.16	0.13	0.235
Female choice	PTI_RR	1.02	0.18	0.920
	PTI_RW	0.81	0.17	0.249
	PTI_WR	0.98	0.18	0.876
	PTI_WW	1.19	0.18	0.288
Male choice	PTI_RR	0.95	0.17	0.723
	PTI_RW	1.11	0.17	0.603
	PTI_WR	0.76	0.15	0.111
	PTI_WW	1.18	0.18	0.326
Multiple choice	PTI_RR	0.95	0.17	0.694
	PTI_RW	0.91	0.17	0.530
	PTI_WR	0.95	0.17	0.706
	PTI_WW	1.20	0.19	0.311

Table show PTI coefficients (estimates of mating preference) and their standard deviation (SD) for each mating pair combination. The software JMATING was used to calculate the coefficients, their standard deviations, and their significance (probability of rejecting the null hypothesis) by resampling the observed values 10,000 times (see Materials and Methods). RR represents a R♀ × R♂ mating, WW represents a W♀ × W♂ mating, RW represents a R♀ × W♂ mating and WR represents a W♀ × R♂ mating.

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