Document Detail

Genetic evidence for extreme polyandry and extraordinary sex-role reversal in a pipefish.
MedLine Citation:
PMID:  11749706     Owner:  NLM     Status:  MEDLINE    
Due to the phenomenon of male pregnancy, the fish family Syngnathidae (seahorses and pipefishes) has historically been considered an archetypal example of a group in which sexual selection should act more strongly on females than on males. However, more recent work has called into question the idea that all species with male pregnancy are sex-role reversed with respect to the intensity of sexual selection. Furthermore, no studies have formally quantified the opportunity for sexual selection in any natural breeding assemblage of pipefishes or seahorses in order to demonstrate conclusively that sexual selection acts most strongly on females. Here, we use a DNA-based study of parentage in the Gulf pipefish Syngnathus scovelli in order to show that sexual selection indeed acts more strongly on females than on males in this species. Moreover, the Gulf pipefish exhibits classical polyandry with the greatest asymmetry in reproductive roles (as quantified by variances in mating success) between males and females yet documented in any system. Thus, the intensity of sexual selection on females in pipefish rivals that of any other taxon yet studied.
A G Jones; D Walker; J C Avise
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  268     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2001-12-25     Completed Date:  2002-06-18     Revised Date:  2010-09-14    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2531-5     Citation Subset:  IM    
Department of Zoology, 3029 Cordley Hall, Oregon State University, Corvallis, OR 97331, USA.
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MeSH Terms
Microsatellite Repeats / genetics*
Selection, Genetic
Sex Characteristics
Sex Determination (Genetics)
Sexual Behavior, Animal*
Smegmamorpha / embryology,  genetics,  physiology*

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