USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Effects of Roadside Transect Width on Waterfowl and Wetland Estimates


Figure 1 - County map of ND illustrating locations of study plots all located in the three topographical sections east of the Missouri River
Figure 1.  Location of forty-five 40-km² plots in North Dakota, 1995.


Figure 2 - Illustration of Inner transect width (400-m area with road as the midline) and Outer transect width (200-m areas outside the Inner transect width)
Figure 2.  Representation of transect and transect width samples for 40-km² plots.


Figure 3 - Line graph illustrating bias in wetland densities
Figure 3.  Bias in wetland densities as a function of wetland area for 800-m and 400-m wide roadside transects. Bias is expressed as a proportion of actual density in 45 plots in North Dakota, 1995.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Friday, 01-Feb-2013 19:51:27 EST
Menlo Park, CA [caww54]