New publication - Spatial asymmetry of the paternity success in nests of a fish with alternative reproductive tactics
Pubblicato il: 11.02.2021 09:32
Spatial asymmetry of the paternity success in nests of a fish with alternative reproductive tactics
Poli, F. Marino, I.A.M.Santon M., Pellizzato G., Bozzetta E., Zane L., Rasotto M.B.
In many species, males compete for matings but the factors determining their relative paternity success are not easy to disentangle. In fish, the structure of reproductive nests has been hypothesized to affect males’ mating success, influencing the relative distance of competitors. In the black goby (Gobius niger), dominant males dig reproductive nests with two entrances of different size, while subordinate males try to sneak and steal fertilizations. We demonstrated that dominant males defend more and sneaking pressure is higher at the larger access of the nest than at the smaller one, where dominants’ paternity success resulted also higher. Such a predictable spatial distribution of the paternity share suggests that nest structure might work as an indirect cue of male relative siring success, potentially influencing the dominant male investment in parental care over the eggs and/or the female egg-deposition behavior.