Studies of integrated phenotypes sometimes reveal correlations between mating effort, favoured by sexual selection, and risk-taking, favoured by survival selection. We used Girardinus metallicus to examine the relationship between rank order of mating effort and risk-taking. We measured risk-taking in a novel environment containing a predator. We then paired males, using aggression to assign dominant or subordinate status, and examined mating behaviour. Dominant males showed higher mating effort, but did not exhibit any relationship between risk-taking and mating effort. Subordinate males exhibited a cross-context correlation, as males were either more willing to take risks and aggressive or more hesitant to take risks and nonaggressive. Less risk-averse, aggressive subordinate males may gain fitness advantages in a more realistic dominance hierarchy, despite being outranked by the rival with which they were paired in our study. Results highlight intraspecific variation in behavioural correlations and the importance of social environment in shaping integrated phenotypes.
Indirect genetic effects influence antipredator behavior in guppies: estimates of the coefficient of interaction PSI and the inheritance of reciprocity. —
The effects of juvenile social interaction on growth rate, size and age at maturity, and adult social behavior in Girardinus metallicus Poey (Pisces: Poeciliidae). —
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Sexual selection in black morph Girardinus metallicus (Pisces: Poeciliidae): females can spot a winner (but we cannot). —