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 need an accessible version of this item please contact JSTOR User Support

Distribution, Density and Longitudinal Zonation of Dryopoid Beetles (Coleoptera: Dryopoidea) in Southwestern Virginia

Henry H. Seagle, Jr. and Albert C. Hendricks
The American Midland Naturalist
Vol. 107, No. 2 (Apr., 1982), pp. 219-227
DOI: 10.2307/2425372
Stable URL: http://www.jstor.org/stable/2425372
Page Count: 9
  • Read Online (Free)
  • Subscribe ($19.50)
  • Cite this Item
If you need an accessible version of this item please contact JSTOR User Support
Distribution, Density and Longitudinal Zonation of Dryopoid Beetles (Coleoptera: Dryopoidea) in Southwestern Virginia
Preview not available

Abstract

Fifteen dryopoid species in five families were collected from the Clinch and North Fork Holston river basins in southwestern Virginia. Eleven of the species were in the family Elmidae. Stenelmis crenata and Psephenus herricki were the most widely distributed species occurring in 11 of 13 streams. Highest dryopoid densities occurred in September and December, and overall mean dryopoid densities for Brumley Creek and the North Fork Holston River were 186 and 2545 m-2, respectively Stenelmis crenata, Optioservus trivittatus, P herricki and Dubiraphia sp. were the most abundant species with overall mean densities of 1204, 903, 247 and 122 m-2, respectively. Oulimnius latiusculus and Promoresia tardella were dominant in the headwaters of Brumley Creek and S. crenata, Optioservus trivittatus, P herricki and Dubiraphia sp. were most prevalent in the lower reaches of Brumley Creek and the North Folk Holston River. Microcylloepus pusillus aptus occurred almost exclusively in the North Fork Holston River. Number of dryopoid species among streams was correlated with highest alkalinity, hardness and conductivity (r≥0.76; p < 0.05). Stream ecosystem function is suggested as an important factor in zonation.

Page Thumbnails

  • Thumbnail: Page 
219
    219
  • Thumbnail: Page 
220
    220
  • Thumbnail: Page 
221
    221
  • Thumbnail: Page 
222
    222
  • Thumbnail: Page 
223
    223
  • Thumbnail: Page 
224
    224
  • Thumbnail: Page 
225
    225
  • Thumbnail: Page 
226
    226
  • Thumbnail: Page 
227
    227