Fig. 2.

Social experience offsets size in territorial fights in A. burtoni. There was a significant effect of age difference on size advantage across winners of territorial disputes in all dyads (P=0.048, Kruskal–Wallis one-way ANOVA). The y-axis is the length of the winning fish minus the length of the losing fish (cm), thus negative values indicate that the winner was smaller. The x-axis is the relative ages of winners across all dyads. No fish that were younger than their opponent won any territorial disputes. Gray circles represent winner–loser size difference in each fight; top and bottom of boxes represent the first and third quartiles, respectively; whiskers extend to the most extreme data points no more than 1.5 times the interquartile range from the box; and horizontal lines within the boxes represent group medians. All but one of the age-matched winners was larger than their opponent, while animals with a greater age difference (6 or 19 days) tended to be smaller.