Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (539 KB)

Title: Use and selection of bridges as day roosts by Rafineque’s big-eared bats

Author: Bennett, Frances M.; Loeb, Susan C.; Bunch, Mary S.;

Date: 2009


Publication Series: Scientific Journal (JRNL)

Description: Rafineque’s big-eared bats (corynorhinus rafinequii) use bridges as day roosts in parts of their range, but information on bridge use across their range is lacking.  From May to Aug. 2002 we surveyed 1129 bridges (12.5%) within all 46 counties of South Carolina to determined use and selection of bridges as day roosts by big-eared bats and to document their distribution across the state.  During summer 2003, we visited 235 bridges in previously occupied areas of the state to evaluate short-term fidelity to bridge roosts.  We found colonies and solitary big-eared bats beneath 38 bridges in 2002 and 54 bridges in 2003.  Construction type and size of bridges strongly influenced use in both years; bats selected large, concrete girder bridges and avoided flat-bottomed slab bridges.  The majority of occupied bridges (94.7%) were in the Upper and Lower Coastal Plains, but a few bridges (5.3%) were located in the Piedmont.  Rafineque’s big-eared bats were absent beneath bridges in the Blue Ridge Mountains.  We established new records of occurrence for 10 counties.  In the Coastal Plains, big-eared bats exhibited a higher degree of short-term fidelity to roosts in highway bridges.  For bridges that were occupied at least once, mean frequency of use was 65.9%.  Probability of finding bats under a bridge ranged from 0.45 to 0.73 depending on whether the bridge was occupied in the previous year.  Thus, bridges should be inspected three to five times in a given year to determine whether they are being used.  Regional bridge roost survey may be a good method for determining the distribution of C. rafinesquii, particularly in the Coastal Plains, and protection of suitable bridges may be a viable conservation strategy where natural root sites are limited.

Keywords: South Carolina, Coastal Plains, Piedmont, bridges, roost, bats

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.



Bennett, Frances M.; Loeb, Susan C.; Bunch, Mary S.; 2009. Use and selection of bridges as day roosts by Rafineque’s big-eared bats. The American Midland Naturalist. 160:386-399


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.