Sexually selected sentinels? Evidence of a role for intrasexual competition in sentinel behavior.

Utilizing data from incubation periods, when the body masses of dominant and subordinate males were assessed, there was no significant effect of body condition (as assessed using the SMI) on the sentinel contributions of males (glmmPQL: t 7 = −1.66, P = 0.14) and, even with SMI retained in the model, the effect of dominance status approached significance despite the comparatively small sample size ( t 7 = −2.32, P = 0.053; n = 11 dominant males and 10 subordinate males of known SMI from 12 groups).

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