Figure 8.

The correlation between the morphological characteristics of male and female antennae. (A) In the three Danaus species. (B) In D. chrysippus. (C) In D. genutia. (D) In D. plexippus. The area and color of the squares indicate the strength of correlations. The stronger the correlation is, the larger the square and the deeper its color. Squares are in blue if the correlation is positive and in red if the correlation is negative. ‘*’ indicates significance at the 0.05 level. ‘**’ indicates significance at the 0.01 level. ‘***’ indicates significance at the 0.001 level.