Key to kangaroo siring success: be in the right place at the right time

Poster session
Partie de:
vendredi 20 déc. 11:30 AM (1 heure)
Dîner   12:30 PM à 01:30 PM (1 heure)
Salle ABCD

In polygynous species, male reproductive success is predicted to be monopolized by a few highly competitive males. This prediction is often not supported, suggesting that ecological and demographic factors influence siring success. The spatiotemporal location of individuals and the number of males competing for each receptive female are often overlooked, because they are difficult to monitor in wild animals. We examined how spatial overlap of female-male pairs, male residency, number of competitors and morphological traits influence siring probability in eastern grey kangaroos (Macropus giganteus). We compared home range overlap for 14,351 dam-male pairs and 295 known dam-sire pairs to define local competitive groups and to estimate every male’s opportunity to sire the young of each female (mating scope). We compared models considering morphological traits relative to the entire population or to local competitive groups to assess if the estimation of local competition improve model performance. Including local competition improved model performance, because it weighed each male’s morphological traits relative to those of its competitive group. Regardless of size, males can increase their probability to sire a young by increasing their mating scope relative to the mother. We underline the importance of considering spatial structure to assess the intensity of competition in species where males cannot access all females in a population. The estimation of mating scope and intensity of local competition improves our understanding of how morphological traits affect siring success when each mating opportunity involves a different set of competing males, a characteristic of most wild species.


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