Genetic polyandry and sexual conflict in the sandbar shark, Carcharhinus plumbeus, in the western North Atlantic and Gulf of Mexico

To investigate patterns of polyandry in the sandbar shark (Carcharhinus plumbeus), 20 pregnant females were sampled from the western North Atlantic and Gulf of Mexico. Five species-specific microsatellite markers were used to genotype each shark and its litter. Of 20 litters, 17 (85%) were shown to...

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Bibliographic Details
Published in:Molecular ecology Vol. 16; no. 1; pp. 187 - 197
Main Authors: PORTNOY, DAVID S, PIERCY, ANDREW N, MUSICK, JOHN A, BURGESS, GEORGE H, GRAVES, JOHN E
Format: Journal Article
Language:English
Published: Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.01.2007
Blackwell Publishing Ltd
Subjects:
anatomy & histology
Animal reproduction
Animals
Atlantic Ocean
Bateman's principles
Biological Evolution
Body size
Carcharhinidae
Carcharhinus
Carcharhinus plumbeus
Elasmobranchii
Female
Females
genetic benefit
Genetic Markers
genetics
Genotype
Genotype & phenotype
Gulf of Mexico
Male
males
Marine
microsatellite
Microsatellite Repeats
paternity
paternity analysis
physiology
polyandry
Polymorphism, Genetic
Population genetics
Regression Analysis
Reproduction
Reproduction - genetics
Reproduction - physiology
Sand bars
Sexual Behavior, Animal
sexually antagonistic co-evolution
Sharks
Sharks - anatomy & histology
Sharks - genetics
Sharks - physiology
sires
Atlantic Ocean
Gulf of Mexico
AN, North Atlantic
ASW, Mexico Gulf
ISSN:0962-1083, 1365-294X
Online Access:Get full text
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Summary:To investigate patterns of polyandry in the sandbar shark (Carcharhinus plumbeus), 20 pregnant females were sampled from the western North Atlantic and Gulf of Mexico. Five species-specific microsatellite markers were used to genotype each shark and its litter. Of 20 litters, 17 (85%) were shown to have multiple sires. In multiply sired litters, the estimated minimum number of sires ranged from two to five with an average of 2.3 males per litter. Regression analysis did not demonstrate a significant relationship between female reproductive success and female body size or sire number and female body size. There was a high incidence of reproductive skew noted in litters, and two groups of males with significantly different mean reproductive success were observed. Analyses using Bateman's principles suggest that there is less direct benefit for females that acquire multiple mates than for males who bias paternity within litters. In light of past morphological and behavioural studies, these data suggest that patterns of polyandry in elasmobranchs may be determined by coercive mating, and that breeding behaviour has likely evolved in the context of sexual conflict.
Bibliography:http://dx.doi.org/10.1111/j.1365-294X.2006.03138.x
ark:/67375/WNG-1KKCV467-0
ArticleID:MEC3138
istex:2FAA9B949E9459A67121F9066BEC1AADC8D400FB
SourceType-Scholarly Journals-1
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ISSN:0962-1083
1365-294X
DOI:10.1111/j.1365-294X.2006.03138.x