Fig. 2
From: Allopatry, competitor recognition and heterospecific aggression in crater lake cichlids
The total rate of aggression by A. sagittae and H. nicaraguensis territory holders (a specimen of each of the two species is pictured at the bottom of the graph) towards non-breeding (boxes with vertical stripes) versus breeding (solid dark boxes) intruder models of A. astorquii (pictured on the top of the graph). The results are given separately for the two sexes of the territory holders. Central horizontal lines within the boxes indicate means, margins of the boxes are for standard errors, and whiskers indicate standard deviations. Sample size for each box: n = 28