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.

Developmental Niche Structure in the Gregarine Assemblage Parasitizing Tenebrio molitor

R. E. Clopton and J. Janovy, Jr.
The Journal of Parasitology
Vol. 79, No. 5 (Oct., 1993), pp. 701-709
DOI: 10.2307/3283608
Stable URL: http://www.jstor.org/stable/3283608
Page Count: 9
  • Read Online (Free)
  • 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.
Developmental Niche Structure in the Gregarine Assemblage Parasitizing Tenebrio molitor
Preview not available

Abstract

The exogenous developmental niche spaces of Gregarina cuneata and Gregarina polymorpha, parasites restricted to larval Tenebrio molitor, and Gregarina niphandrodes, a parasite restricted to adult T. molitor, were determined along temperature and humidity axes and associated with parasite niche space on the host resource axis. Gregarine gametocysts were incubated at controlled humidity (0,10, and 20 mm Hg vapor pressure deficit) at 20, 25, 30, and 35 C to determine the environmental limits to survival and sporulation. Although the environmental conditions that permit gametocyst development overlap, the gregarine parasite restricted to adult T. molitor utilizes a subset of sporulation and survival conditions that is incompatible with the developmental needs of the gregarines restricted to larval T. molitor. Likewise, the gregarine parasites that are restricted to larval T. molitor survive and sporulate under a subset of environmental conditions that are incompatible with the developmental needs of the gregarine restricted to adult T. molitor. Gregarina niphandrodes survived and sporulated under extended environmental conditions characterized by lower humidity and temperature. In contrast, G. cuneata and G. polymorpha survived and sporulated under extended environmental conditions at the upper end of the temperature scale. The pattern of interspecific variation in the environmental tolerances of the exogenous gregarine stages is analogous to the pattern of interspecific variation in host stadium specificity observed in the corresponding endogenous gregarine stages.

Page Thumbnails

  • Thumbnail: Page 
701
    701
  • Thumbnail: Page 
702
    702
  • Thumbnail: Page 
703
    703
  • Thumbnail: Page 
704
    704
  • Thumbnail: Page 
705
    705
  • Thumbnail: Page 
706
    706
  • Thumbnail: Page 
707
    707
  • Thumbnail: Page 
708
    708
  • Thumbnail: Page 
709
    709