NDLI: Polyandry and paternity in a wild population of the swordtail Xiphophorus nigrensis

Content Provider	Springer Nature Link
Author	Smith, Chad C.
Copyright Year	2013
Abstract	Genetic analyses of parentage provide crucial information about the prevalence of polyandry and the potential for sexual selection to operate in wild populations. In the swordtail Xiphophorus nigrensis, large males are thought to have a competitive advantage due to their superiority in male–male contests and attractiveness to females, who are presumed to mate multiply. I examined the distribution of paternity within broods, the relationship between male body size and paternity and the effect of sire number on fecundity from females collected in the field. Sixty-one percent of females produced offspring from two to four males, with 70% of the offspring typically sired by one of the males represented in the brood. Male body size did not affect paternity share or whether females were multiply mated, as predicted if precopulatory sexual selection has a strong effect on the outcome of postcopulatory sexual selection. Female fecundity increased with the number of sires; however, this relationship was not observed when the smallest broods, where multiple mating is more difficult to detect, were excluded from the analysis. The high levels of multiple paternity and reproductive skew suggest that postcopulatory sexual selection has important evolutionary consequences in X. nigrensis. Traits important in precopulatory sexual selection, such as male body size, however, are more likely to affect sexual selection by increasing the number of mates obtained rather than paternity share within broods.
Starting Page	415
Ending Page	424
Page Count	10
File Format	PDF
ISSN	03405443
Journal	Behavioral Ecology and Sociobiology
Volume Number	68
Issue Number	3
e-ISSN	14320762
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-12-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sexual selection Reproductive skew Genetic mating system Parentage Poeciliidae Behavioural Sciences Zoology Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Data from: Polyandry and postcopulatory sexual selection in a wild population (Dataset)

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Data from: Polyandry and postcopulatory sexual selection in a wild population (Dataset)

The genetic mating system of a sea spider with male-biased sexual size dimorphism: evidence for paternity skew despite random mating success

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