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The relationship between offspring sex ratio and average mate attractiveness (measured as mean mass of males greater than or equal to 1.5 years) in reindeer herds during the rut the year before calving. Dotted lines are 95% confidence intervals. The size of the circles is directly proportional to the sample size (i.e. the number of offspring born in each manipulation). The number within circles refers to the treatment number (see table 1).
