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Hatching rates (proportion) assessed every 12 h under the different thermal regimes (cold (C), 2°C; warm (W), 8°C). Letters in the treatment acronyms are ordered as follows: egg temperature, sperm temperature, embryo development temperature. The means (dots) ± standard deviations (vertical bars) are shown for a total of 80 split-design crosses, with ten males and ten females crossed pairwise.
