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.

Density-Dependent Sexual Selection in the Fungus Beetle, Bolitotherus cornutus

Jeffrey Conner
Evolution
Vol. 43, No. 7 (Nov., 1989), pp. 1378-1386
DOI: 10.2307/2409454
Stable URL: http://www.jstor.org/stable/2409454
Page Count: 9
  • 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.
Density-Dependent Sexual Selection in the Fungus Beetle, Bolitotherus cornutus
Preview not available

Abstract

The hypothesis that population density can affect sexual selection on male horn size was tested in a three-year study of a fungus beetle, Bolitotherus cornutus. Males of this species have horns that vary greatly in length. These horns are used in fights over females; longer-horned males win the majority of fights, regardless of population density. However, density does affect the relationship between horn length and access to females. In six populations of naturally and experimentally varying densities, longer-horned males gained a greater advantage in access to females in low-density populations than at high density. This increase in access to females causes an increase in the number of females inseminated by longer-horned males; thus, sexual selection for longer horns is stronger at lower densities.

Page Thumbnails

  • Thumbnail: Page 
1378
    1378
  • Thumbnail: Page 
1379
    1379
  • Thumbnail: Page 
1380
    1380
  • Thumbnail: Page 
1381
    1381
  • Thumbnail: Page 
1382
    1382
  • Thumbnail: Page 
1383
    1383
  • Thumbnail: Page 
1384
    1384
  • Thumbnail: Page 
1385
    1385
  • Thumbnail: Page 
1386
    1386