Document Detail

Negative frequency-dependent selection maintains a dramatic flower color polymorphism in the rewardless orchid Dactylorhiza sambucina (L.) Soo.
MedLine Citation:
PMID:  11353863     Owner:  NLM     Status:  MEDLINE    
The orchid Dactylorhiza sambucina shows a stable and dramatic flower-color polymorphism, with both yellow- and purple-flowered individuals present in natural populations throughout the range of the species in Europe. The evolutionary significance of flower-color polymorphisms found in many rewardless orchid species has been discussed at length, but the mechanisms responsible for their maintenance remain unclear. Laboratory experiments have suggested that behavioral responses by pollinators to lack of reward availability might result in a reproductive advantage for rare-color morphs. Consequently, we performed an experiment varying the relative frequency of the two color morphs of D. sambucina to test whether rare morph advantage acted in the natural habitat of the species. We show here clear evidence from this manipulative experiment that rare-color morphs have reproductive advantage through male and female components. This is the first demonstration, to our knowledge, that negative frequency-dependent selection through pollinator preference for rare morphs can cause the maintenance of a flower-color polymorphism.
L D Gigord; M R Macnair; A Smithson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2001-05-15
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  98     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2001 May 
Date Detail:
Created Date:  2001-05-24     Completed Date:  2001-07-19     Revised Date:  2013-04-17    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  6253-5     Citation Subset:  IM    
Hatherly Laboratories, Department of Biological Sciences, University of Exeter, Prince of Wales Road, Exeter EX4 4PS, United Kingdom.
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MeSH Terms
Angiosperms / genetics*
Gene Frequency
Genes, Plant*
Polymorphism, Genetic*
Selection, Genetic*
Erratum In:
Proc Natl Acad Sci U S A. 2004 May 18;101(20):7839

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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