title: Multiple mating and reproductive skew in parental and introgressed females of the live-bearing fish Xiphophorus birchmanni.
abstract: Just as mating patterns can promote speciation or hybridization, the presence of hybridization can shape mating patterns within a population. In this study, we characterized patterns of multiple mating and reproductive skew in a naturally hybridizing swordtail fish species, Xiphophorus birchmanni. We quantified multiple mating using microsatellite markers to genotype embryos from 43 females collected from 2 wild populations. We also used a suite of single-nucleotide polymorphism markers to categorize females and their inferred mates as either parental X. birchmanni or as introgressed individuals, which carried alleles from a sister species, X. malinche. We found that parental and introgressed X. birchmanni females mated multiply with both parental and introgressed males. We found no difference in mating patterns or reproductive skew between parental and introgressed X. birchmanni females. However, nonintrogressed X. birchmanni males mated more often with large, fecund females. These females also had the greatest levels of skew in fertilization success of males. Thus, our results show that X. birchmanni has a polygynandrous mating system and that introgression of X. malinche alleles has only subtle effects on mating patterns in this species.
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal). kpaczolt@umd.edu.
authors.forename: Kimberly A
authors.initials: KA
authors.lastname: Paczolt
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal).
authors.forename: Courtney N
authors.initials: CN
authors.lastname: Passow
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal).
authors.forename: Pablo J
authors.initials: PJ
authors.lastname: Delclos
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal).
authors.forename: Holly K
authors.initials: HK
authors.lastname: Kindsvater
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal).
authors.forename: Adam G
authors.initials: AG
authors.lastname: Jones
authors.affiliation: From the Department of Biology, 3258 TAMU, Texas A&M University, College Station, TX 77843 (Paczolt, Passow, Delclos, Jones, and Rosenthal); and the Centro de Investigaciones Científicas de las Huastecas "Aguazarca," Calnali, Hidalgo, Mexico (Passow, Delclos, Kindsvater, and Rosenthal).
authors.forename: Gil G
authors.initials: GG
authors.lastname: Rosenthal
mesh_terms: D000818:Animals; D003198:Computer Simulation; D003532:Cyprinodontiformes / Q000235:genetics* / Q000502:physiology*; D005260:Female; D005828:Genetics, Population; D005838:Genotype; D006824:Hybridization, Genetic; D008297:Male; D008800:Mexico; D018895:Microsatellite Repeats / Q000235:genetics; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012098:Reproduction / Q000502:physiology*; D012726:Sexual Behavior, Animal / Q000502:physiology*; D013045:Species Specificity
keywords: hybrid zone; microsatellite; parentage; polygynandry; swordtail