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.

Stabilizing Selection on Body Mass in the Sociable Weaver Philetairus socius

Rita Covas, Charles R. Brown, Mark D. Anderson and Mary Bomberger Brown
Proceedings: Biological Sciences
Vol. 269, No. 1503 (Sep. 22, 2002), pp. 1905-1909
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/3067882
Page Count: 5
  • Read Online (Free)
  • 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.
Stabilizing Selection on Body Mass in the Sociable Weaver Philetairus socius
Preview not available

Abstract

The survival of small birds is often believed to increase with increasing body mass, despite some evidence that body mass is usually maintained below the physiological maximum and that there are costs associated with high body mass, such as increased energetic expenditure and predation risk. In this study, we used an eight-year dataset to investigate survival in relation to body mass in a wild population of sociable weavers (Philetairus socius), a savannah-dwelling passerine bird. We present evidence for strong stabilizing selection on body mass, verifying the prediction that body mass probably results from a trade-off between the risks of starvation at low mass and predation at high mass.

Page Thumbnails

  • Thumbnail: Page 
1905
    1905
  • Thumbnail: Page 
1906
    1906
  • Thumbnail: Page 
1907
    1907
  • Thumbnail: Page 
1908
    1908
  • Thumbnail: Page 
1909
    1909