Figure 1.

Mean differences (±SE) in (a) competitive ability and (b) aggression among offspring of female salmon that had matured early (EM_M) or late (LM_M). Data from pairs consisting of 1 juvenile from an EM mother and 1 juvenile from an LM mother competing for food and a feeding territory in sections of a stream tank. Competitive ability was calculated as the number of food items acquired by an individual over the 2 days of observation. Aggression refers to the total number of aggressive acts perpetrated by an individual during the observation period. See text for full details.