title: The behavioural and genetic mating system of the sand tiger shark, Carcharias taurus, an intrauterine cannibal.
abstract: Sand tiger sharks (Carcharias taurus) have an unusual mode of reproduction, whereby the first embryos in each of the paired uteri to reach a certain size ('hatchlings') consume all of their smaller siblings during gestation ('embryonic cannibalism' or EC). If females commonly mate with multiple males ('behavioural polyandry') then litters could initially have multiple sires. It is possible, however, that EC could exclude of all but one of these sires from producing offspring thus influencing the species genetic mating system ('genetic monogamy'). Here, we use microsatellite DNA profiling of mothers and their litters (n = 15, from two to nine embryos per litter) to quantify the frequency of behavioural and genetic polyandry in this system. We conservatively estimate that nine of the females we examined (60%) were behaviourally polyandrous. The genetic mating system was characterized by assessing sibling relationships between hatchlings and revealed only 40 per cent genetic polyandry (i.e. hatchlings were full siblings in 60% of litters). The discrepancy stemmed from three females that were initially fertilized by multiple males but only produced hatchlings with one of them. This reveals that males can be excluded even after fertilizing ova and that some instances of genetic monogamy in this population arise from the reduction in litter size by EC. More research is needed on how cryptic post-copulatory and post-zygotic processes contribute to determining paternity and bridging the behavioural and genetic mating systems of viviparous species.
authors: School of Marine and Atmospheric Science, Institute for Ocean Conservation Science, Stony Brook University, Stony Brook, NY 11794, USA. demian.chapman@stonybrook.edu
authors: Demian D
authors: DD
authors: Chapman
authors: Sabine P
authors: SP
authors: Wintner
authors: Debra L
authors: DL
authors: Abercrombie
authors: Jimiane
authors: J
authors: Ashe
authors: Andrea M
authors: AM
authors: Bernard
authors: Mahmood S
authors: MS
authors: Shivji
authors: Kevin A
authors: KA
authors: Feldheim
mesh_terms: D000818:Animals; D004276:DNA, Satellite / Q000235:genetics; D005260:Female; D011235:Predatory Behavior; D012726:Sexual Behavior, Animal; D012754:Sharks / Q000235:genetics / Q000502:physiology*
chemical_list: D004276:DNA, Satellite
keywords: adelphophagy; monogamy; polyandry
references: Annu Rev Genet. 2002;36:19-45
references: 12429685
references: Mol Ecol. 2004 Jul;13(7):1965-74
references: 15189217
references: Mol Ecol. 2008 Jun;17(11):2566-80
references: 18452517