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Effect of cold shock (A) or no shock (B) on copulation duration. (A) We assayed copulation duration 4 h, 12 h and 30 h post cold shock. Closed bars represent FCB and open bars represent FSB populations. Selection, period and Selection × period had no significant effect on copulation duration. (B) Under no-shock treatment, there was no significant difference in copulation duration between FSB and FCB males.
