Table 2. Adaptive thermal plasticity in sperm and eggs improves gamete performance.

			Sperm		Eggs
Line	Gamete production	Gamete performance	Offspring	N	Viability	N
KSS	30°C	30°C	349.5 ± 151.5	27	90 ± 2%	8
KSS	38°C	30°C	248.8 ± 140.9	27	80 ± 5%	8
KSS	30°C	38°C	91.0 ± 61.8	27	78 ± 8%	8
KSS	38°C	38°C	179.6 ± 61.8	27	80 ± 3%	8
KSS	30°C	40°C			27 ± 5%	8
KSS	38°C	40°C			36 ± 5%	8

Sperm performance was measured by mating focal males to tester females and counting all offspring produced over a 100d period. Egg performance was measured as the proportion of eggs that developed into adult offspring, tested in groups of 50 eggs (see main text and Figures 3 and 4).