Positive genetic correlation between brain size and sexual traits in male guppies artificially selected for brain size.

We also detected a nonsignificant trend ( P = 0.067) towards more orange coloration in the larger‐brained males.

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The area of black melanin spots did not differ between large‐ and small‐brained males (Table 2 ), but large‐brained males showed a trend towards a greater orange spot area (Table 2 ; Fig. 1 b) and a significantly greater area of iridescence (Table 2 ; Fig. 1 c).

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