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The Bateman gradient and the cause of sexual selection in a sex-role-reversed pipe sh
 

Summary: The Bateman gradient and the cause of sexual
selection in a sex-role-reversed pipe sh
Adam G. Jones1,4*
, Gunilla Rosenqvist2
, Anders Berglund3
, Stevan J. Arnold4
and John C. Avise1
1Department of Genetics, University of Georgia, Athens, GA 30602, USA
2
Department of Zoology, Norwegian University of Science andTechnology, N-7491 Trondheim, Norway
3Department of Animal Ecology, Uppsala University, Norbyva« gen 18d, S-752 36 Uppsala, Sweden
4Department of Zoology, Oregon State University, Corvallis, OR 97331, USA
As a conspicuous evolutionary mechanism, sexual selection has received much attention from theorists
and empiricists. Although the importance of the mating system to sexual selection has long been
appreciated, the precise relationship remains obscure. In a classic experimental study based on parentage
assessment using visible genetic markers, more than 50 years ago A. J. Bateman proposed that the cause
of sexual selection in Drosophila is `the stronger correlation, in males (relative to females), between number
of mates and fertility (number of progeny)'. Half a century later, molecular genetic techniques for
assigning parentage now permit mirror-image experimental tests of the `Bateman gradient' using sex-
role-reversed species. Here we show that, in the male-pregnant pipe¢sh Syngnathus typhle, females exhibit

  

Source: Arnold, Stevan J. - Department of Zoology, Oregon State University
Jones, Adam - Department of Biology, Texas A&M University

 

Collections: Biology and Medicine; Environmental Sciences and Ecology