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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Veröffentlicht in:	Molecular ecology Jg. 16; H. 1; S. 187 - 197
Hauptverfasser:	PORTNOY, DAVID S, PIERCY, ANDREW N, MUSICK, JOHN A, BURGESS, GEORGE H, GRAVES, JOHN E
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.01.2007 Blackwell Publishing Ltd
Schlagworte:	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-Zugang:	Volltext
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Zusammenfassung:	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.
Bibliographie:	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 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0962-1083 1365-294X
DOI:	10.1111/j.1365-294X.2006.03138.x