Female mate choice and male body size.

<p>Relationship between male size difference (standard length of preferred male − standard length of non-preferred male) and strength of female preference (difference in time spent with preferred and non-preferred male) in the annual killifish <i>A. reicherti</i> at the beginning (black circles, black line) and end (white circles, dashed line) of the reproductive season. Negative scores indicate more time with smaller male, positive scores indicate more time with larger male.