Figure 2

Ontogenetic changes in allometric scaling between body size and thoracic horn length in male Onthophagus nigriventris. (A) Scaling relationship between body size (presented as standard deviations away from mean) and horn length in male pupae (●) and corresponding adults (○). Allometries differ significantly both in amplitude and slope. (B) Absolute (■ right) and relative (□ left) loss of pupal horn length as a function of adult male body size. Both absolute and relative horn loss decline drastically with adult size.(C) Log-log plot of pupal against adult horn length. Gray line indicates expectation if adult horn length is a direct reflection of pupal horn length (y-intercept = 0, slope = 1). Regression analysis shows that the y-intercept is significantly different from 0 (indicating pupal remodeling) and the slope is significantly greater than 1 (indicating that remodeling occurs to a greater degree in minor compared to major male morphs). Red lines indicate 99% confidence intervals.