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.

Thermal Evolution of Egg Size in Drosophila melanogaster

Ricardo B. R. Azevedo, Vernon French and Linda Partridge
Evolution
Vol. 50, No. 6 (Dec., 1996), pp. 2338-2345
DOI: 10.2307/2410702
Stable URL: http://www.jstor.org/stable/2410702
Page Count: 8
  • 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.
Thermal Evolution of Egg Size in Drosophila melanogaster
Preview not available

Abstract

We measured the size of eggs produced by populations of Drosophila melanogaster that had been collected along latitudinal gradients in different continents or that had undergone several years of culture at different temperatures in the laboratory. Australian and South American populations from higher latitudes produced larger eggs when all were compared at a standard temperature. Laboratory populations that had been evolving at 16.5⚬C produced larger eggs than populations that had evolved at 25⚬C or 29⚬C, suggesting that temperature may be an important selective agent in producing the latitudinal clines. Flies from laboratory populations produced larger eggs at an experimental temperature of 16.5⚬C than at 25⚬C, and there was no indication of genotype-environment interaction for egg size. Evolution of egg size in response to temperature cannot be accounted for by differences in adult body size between populations. It is not clear which life-history traits are direct targets of thermal selection and which are showing correlated responses, and disentangling these is a task for the future.

Page Thumbnails

  • Thumbnail: Page 
2338
    2338
  • Thumbnail: Page 
2339
    2339
  • Thumbnail: Page 
2340
    2340
  • Thumbnail: Page 
2341
    2341
  • Thumbnail: Page 
2342
    2342
  • Thumbnail: Page 
2343
    2343
  • Thumbnail: Page 
2344
    2344
  • Thumbnail: Page 
2345
    2345