First evidence of multiple paternity in the bull shark (Carcharhinus leucas)

Agathe Pirog (1) , Sébastien Jaquemet (2, 1) , Marc Soria (3) , Hélène Magalon (2, 1)

1 ENTROPIE [Réunion] - Ecologie marine tropicale dans les Océans Pacifique et Indien
2 LabEX CORAIL - Laboratoire d'Excellence CORAIL
3 UMR EME - Ecosystèmes Marins Exploités

The present study assessed the occurrence of multiple paternity in four litters of bull shark Carcharhinus leucas (n¼5, 8, 9 and 11 embryos) sampled at Reunion Island in the Western Indian Ocean. Using 21 microsatellite loci, we revealed that two litters were generated from two sires each, demonstrating for the first time multiple paternity for this species. We also reported a high paternal skew (10 : 1 in Litter 1 and 7 : 1 in Litter 3), which may be because of postcopulatory or post-zygotic selection processes. These results contribute to a better understanding of the reproductive behaviour of the bull shark, which remains poorly documented. The present study must be expanded to assess the frequency of multiple paternity in this species, and to test for genetic or cryptic benefits (convenience polyandry), which is important for long-term conservation and management plans.

Domaines: Biodiversité et Ecologie

Agathe Pirog, Sébastien Jaquemet, Marc Soria, Hélène Magalon. First evidence of multiple paternity in the bull shark (Carcharhinus leucas). Marine and Freshwater Research, 2015, ⟨10.1071/mf15255⟩. ⟨hal-01253775⟩