Table 1 Effects of nine separate mutations on the average proportion of matings achieved by mutant relative to stock males ( p̄_ms) and the resulting selective coefficient (s_ms; a negative value corresponds to a deleterious allele) when assayed in two different environments

Mutation	Ancestral (cornmeal) environment			Novel (corn-flour) environment
	p̄ _ms	s_ms	P	p̄ _ms	s_ms	P
brown	0.335	−0.496	<0.001^*	0.360	-0.438	<0.001^*
cinnabar	0.385	−0.374	0.008^*	0.340	−0.485	<0.001^*
claret	0.425	−0.261	0.003^*	0.465	−0.131	0.376
eyeless	0.285	−0.601	<0.001^*	0.215	−0.726	<0.001^*
forked	0.440	−0.214	0.131	0.380	−0.387	0.001^*
plexus	0.480	−0.0769	0.599	0.530	0.128	0.368
sepia	0.435	−0.230	0.044^*	0.470	−0.113	0.390
white	0.140	−0.837	<0.001^*	0.105	−0.883	<0.001^*
yellow	0.365	−0.425	0.002^*	0.440	−0.214	0.131
Mean (±s.e)	0.366 (0.034)	−0.391 (0.077)		0.367 (0.045)	−0.361 (0.106)

Significance (P) was evaluated by one-sample t-test (t) to determine whether p̄_ms differed from 0.5 (the null hypothesis of equal mating success of mutant and stock males), treating cages as replicates (df=19 in all cases). The asterisks denote P⩽0.05.

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