title: Frequency of multiple paternity in the spiny dogfish Squalus acanthias in the western north Atlantic.
abstract: Multiple paternity (MP) has been shown to be widespread in elasmobranch fishes although its prevalence and the number of sires per litter vary considerably among species. In the squaloid shark Squalus acanthias, MP has been reported, but whether it is a common feature of the species' reproductive strategy is unknown. In this study, we determined the frequency of MP in 29 litters of S. acanthias sampled from the lower Chesapeake Bay and coastal Virginia waters, using 7 highly polymorphic nuclear DNA microsatellite loci. Only 5 litters (17% of the total) were genetically polyandrous, with at least 2 sires per litter. Litter size increased with female size but was similar between polyandrous and monandrous females.
authors.affiliation: Department of Fisheries Science, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA 23062, USA. averissimo@vims.edu
authors.forename: Ana
authors.initials: A
authors.lastname: Veríssimo
authors.forename: Dean
authors.initials: D
authors.lastname: Grubbs
authors.forename: Jan
authors.initials: J
authors.lastname: McDowell
authors.forename: John
authors.initials: J
authors.lastname: Musick
authors.forename: David
authors.initials: D
authors.lastname: Portnoy
mesh_terms: D000818:Animals; D001267:Atlantic Ocean; D005260:Female; D005306:Fertilization; D056426:Genetic Loci; D007178:Inbreeding; D018895:Microsatellite Repeats; D010060:Ovulation / Q000235:genetics*; D058974:Phylogeography; D012044:Regression Analysis; D017422:Sequence Analysis, DNA; D012726:Sexual Behavior, Animal; D048251:Squalus acanthias / Q000235:genetics*; D014768:Virginia; D052286:Viviparity, Nonmammalian