Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Experimental Studies of the Evolutionary Significance of Sexual Reproduction. I. A Test of the Frequency-Dependent Selection Hypothesis

Janis Antonovics and Norman C. Ellstrand
Evolution
Vol. 38, No. 1 (Jan., 1984), pp. 103-115
DOI: 10.2307/2408550
Stable URL: http://www.jstor.org/stable/2408550
Page Count: 13
  • Read Online (Free)
  • Download ($4.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available

Abstract

This study tests the hypothesis that one evolutionary advantage of sexual reproduction is that it produces rare or unique genotypes with a frequency-dependent advantage. Our experimental approach involved planting clonal tillers of the grass Anthoxanthum odoratum into natural sites. In two different experiments, clones in situations as a minority genotype had approximately a twofold increase of fitness compared to those in majority genotype situations. Although fitness data were strongly skewed and highly variable, overall these differences were significant. The data reported here are in concordance with the theoretical expectations of the frequency-dependent hypothesis for the evolutionary significance of sex and represent the first experimental demonstration of frequency-dependent selection under natural field conditions.

Page Thumbnails

  • Thumbnail: Page 
103
    103
  • Thumbnail: Page 
104
    104
  • Thumbnail: Page 
105
    105
  • Thumbnail: Page 
106
    106
  • Thumbnail: Page 
107
    107
  • Thumbnail: Page 
108
    108
  • Thumbnail: Page 
109
    109
  • Thumbnail: Page 
110
    110
  • Thumbnail: Page 
111
    111
  • Thumbnail: Page 
112
    112
  • Thumbnail: Page 
113
    113
  • Thumbnail: Page 
114
    114
  • Thumbnail: Page 
115
    115