Table 1 Coefficients of a logistic regression model of sporulation efficiency.

	Estimate	Std. error	Z value	Pr(>\|z\|)
(Intercept)	−7.6058	1.0315	−7.3734	0.0000
Temperature	0.6882	0.0842	8.1750	0.0000
Temperature²	−0.0182	0.0021	−8.8585	0.0000
Species (S. uvarum)	3.6304	0.7785	4.6634	0.0000
Pure-strain diploid	−0.2157	0.7152	−0.3015	0.7630
Temperature:SK1	0.2896	0.0571	5.0682	0.0000
Temperature:DBVPG1106/SK1	0.2222	0.0516	4.3051	0.0000
Temperature:DBVPG1106	0.1644	0.0579	2.8368	0.0046
Temperature:DBVPG6044/SK1	0.2522	0.0527	4.7842	0.0000
Temperature:DBVPG6044	0.1594	0.0577	2.7619	0.0057
Temperature:Y12/SK1	0.2080	0.0511	4.0720	0.0000
Temperature:Y12	0.1258	0.0575	2.1865	0.0288
Temperature:YILC17_E5/SK1	0.0846	0.0507	1.6687	0.0952
Temperature:YILC17_E5	−0.0728	0.1200	−0.6070	0.5438
Temperature:UWOPS83_787_3/SK1	0.1943	0.0506	3.8393	0.0001
Temperature:GM14/CBS7001	−0.0062	0.0420	−0.1480	0.8824
Temperature:GM14	−0.0557	0.0532	−1.0476	0.2948
Temperature:yHCT78/CBS7001	0.0065	0.0424	0.1524	0.8789
Temperature:yHCT78	0.0342	0.0512	0.6679	0.5042
Temperature:ZP646/CBS7001	−0.0265	0.0418	−0.6342	0.5259
Temperature:ZP646	−0.0708	0.0546	−1.2959	0.1950
Temperature:UCD61-137/CBS7001	−0.0222	0.0418	−0.5326	0.5943
Temperature:DBVPG7787/CBS7001	−0.0518	0.0426	−1.2166	0.2237

We included whether a strain was heterozygous for a tester strain or a “pure” strain background as a correction in our model (indicated as Pure-strain diploid). Strains SK1, DBVPG1106, DBVPG6044, Y12, and YILC17_E5, and UWOPS83_787_3 are S. cerevisiae strains, either listed as a “pure” strain or crossed to tester SK1. Strains GM14, yHCT78, ZP646, UCD61-137, and DBVPG7787 are S. uvarum strains, either listed as a “pure” strain or crossed to tester CBS7001. Temperature:strain terms are in relation to strain CBS7001/CBS7001.

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