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Effects of Roadside Transect Width on Waterfowl and Wetland Estimates

Figures


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.

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