Predictions | Support? | Source |
---|---|---|
H1: Sexual selection hypothesis | ||
P1: SSD predicts the presence of dewlaps (interspecific) | No | This study |
P2: Dewlap size predicts dominance status (intraspecific) | ‘Yes’, but not after control for age | Bro-Jørgensen & Beeston (2015) |
P3: Dewlap size predicts master bull status (intraspecific) | No | Bro-Jørgensen & Beeston (2015) |
H2: Predator deterrence hypothesis | ||
P1: Large dewlap size predicts the absence of claw-marks (intraspecific) | No, the opposite | This study |
P2: If condition-dependent handicap, scars from predation attempts present on dewlaps (intraspecific) | No | This study |
H3: Thermoregulation hypothesis | ||
P1: Large body size predicts the presence of dewlaps (interspecific) | Yes (threshold approx. 400 kg) | This study |