Joint Influence of Gene Flow and Selection on a Reproductively Important Genetic-Polymorphism in the Fire Ant Solenopsis-Invicta

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Etat: Public
Version: de l'auteur
ID Serval
serval:BIB_6181B2F1C88C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Joint Influence of Gene Flow and Selection on a Reproductively Important Genetic-Polymorphism in the Fire Ant Solenopsis-Invicta
Périodique
American Naturalist
Auteur(s)
Ross  K. G., Keller  L.
ISSN
0003-0147
Statut éditorial
Publié
Date de publication
09/1995
Peer-reviewed
Oui
Volume
146
Numéro
3
Pages
325-348
Notes
Rq971 Times Cited:42 Cited References Count:54 --- Old month value: Sep
Résumé
We present evidence that gene flow counteracts directional selection to maintain a high level of polymorphism at Pgm-3, a gene known to have a major effect on reproduction in the population of Solenopsis invicta that we studied. Reproductive queens in this population never possess the homozygous genotype Pgm-3(ala), whereas prereproductive and nonreproductive females possess it at substantial frequencies. The loss of Pgm-3(ala) queens, which occurs because workers selectively destroy all such queens as they initiate reproductive development, constitutes a process of strong negative selection on the allele Pgm-3(a) that now has been observed over a 4-yr period. This allele is maintained at high frequency in the study population in spite of such directional selection by means of gene flow from a population of a different social form, in which equivalent selection is not found and the allele Pgm-3(a) is common. Evidence for such gene flow comes from two sources in this study. First, Pgm-3 genotype and allele frequencies for parental and offspring generations suggest that a large majority of matings at our six study sites are between resident females and immigrant males of the alternate social form. The inferred proportions of matings attributable to immigrant males at each site vary predictably according to the distance from an upwind source of such males. Second, the proportions of queens that are mated within the study population depend to a large extent on the proximity of the queens to an upwind source of immigrant males. This system offers a unique view of how gene flow occurring in the face of strong, locally restricted selection can affect the extent and distribution of genetic variation.
Mots-clé
natural-populations social insect queen number hymenoptera formicidae migration frequency colonies clines tests
Web of science
Open Access
Oui
Création de la notice
24/01/2008 19:39
Dernière modification de la notice
20/08/2019 15:18
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