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.

Population Sizes and Within-Deme Movement of Trimerotropis saxatilis (Acrididae), a Grasshopper with a Fragmented Distribution

Anne S. Gerber and Alan R. Templeton
Oecologia
Vol. 105, No. 3 (1996), pp. 343-350
Published by: Springer in cooperation with International Association for Ecology
Stable URL: http://www.jstor.org/stable/4221192
Page Count: 8
  • Download ($43.95)
  • Cite this Item
Population Sizes and Within-Deme Movement of Trimerotropis saxatilis (Acrididae), a Grasshopper with a Fragmented Distribution
Preview not available

Abstract

Capture-mark-recapture studies were initiated in 1990 on four Missouri populations of the lichen grasshopper, Trimerotropis saxatilis. This grasshopper lives only on glade habitat, predominantly in the Ozark Mountains. Genetic data suggest that no gene flow occurs among T. saxatilis populations. Lichen grasshopper population size (both present and historical), and the likelihood of movement within and between glades, are the subjects of this study. Population sizes on all glades were found to be small (<280 individuals) and to vary from year to year. Inbreeding effective sizes were found to be much larger than census sizes. On one of the sites, Graham Cave Glade, population size was calculated for 5 years; in 3 of those years (1991, 1993 and 1994) our studies of this population also tested for movement of T. saxatilis individuals among different regions of the moderately subdivided glade. Maintenance of Graham Cave Glade (burning and clearing) was initiated after the 1991 capture-mark-recapture season. Comparisons of before- and after-burning intraglade movement probabilities did not show a significant difference. Grasshoppers more frequently remained in the part of the glade where they were previously captured, but were able to move about the moderately subdivided glade. The presence of a closed-canopy forest, rather than distance, appears to be an effective dispersal barrier.

Page Thumbnails

  • Thumbnail: Page 
[343]
    [343]
  • Thumbnail: Page 
344
    344
  • Thumbnail: Page 
345
    345
  • Thumbnail: Page 
346
    346
  • Thumbnail: Page 
347
    347
  • Thumbnail: Page 
348
    348
  • Thumbnail: Page 
349
    349
  • Thumbnail: Page 
350
    350