USGS - science for a changing world

Northern Prairie Wildlife Research Center

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

Floristic Quality Assessment of One Natural and Three Restored Wetland Complexes in North Dakota, USA

David M. Mushet, Ned H. Euliss, Jr., and Terry L. Shaffer


Abstract: Floristic quality assessment is potentially an important tool for conservation efforts in the northern Great Plains of North America, but it has received little rigorous evaluation. Floristic quality assessments rely on coefficients assigned to each plant species of a region's flora based on the conservatism of each species relative to others in the region. These “coefficients of conservatism” (C values) are assigned by a panel of experts familiar with a region's flora. The floristic quality assessment method has faced some criticism due to the subjective nature of these assignments. To evaluate the effect of this subjectivity on floristic quality assessments, we performed separate evaluations of the native plant communities in a natural wetland complex and three restored wetland complexes. In our first assessment, we used C values assigned “subjectively” by the Northern Great Plains Floristic Quality Assessment Panel. We then performed an independent assessment using the observed distributions of species among a group of wetlands that ranged from highly disturbed to largely undisturbed (data-generated C values). Using the panel-assigned C values, mean C values (Mean C value) of the restored wetlands rarely exceeded 3.4 and never exceeded 3.9, with the highest values occurring in the oldest restored complex; all but two wetlands in the natural wetland complex had a Mean C value greater than 3.9. Floristic quality indices (FQI) for the restored wetlands rarely exceeded 22 and usually reached maximums closer to 19, with higher values occurring again in the oldest restored complex; only two wetlands in the natural complex had an FQI less than 22. We observed that 95% confidence limits for species richness and percent natives overlapped greatly among wetland complexes, whereas confidence limits for both Mean C value and FQI overlapped little. Mean C value and FQI values were consistently greater when we used the data-generated C values than when we used the panel-assigned C values; nonetheless, conclusions reached based on these two independent assessment techniques were virtually identical. Our results are consistent with the opinion that coefficients assigned subjectively by expert botanists familiar with a region's flora provide adequate information to perform accurate floristic quality assessments.

Key Words: conservatism, floristic quality assessment, Great Plains, hydrophytes, monitoring, prairie pothole region, species richness, wetland plants, wetland restoration


This resource is based on the following resource (Northern Prairie Publication 1162):

Mushet, David M., Ned H. Euliss, Jr., and Terry L. Shaffer.  2002.  Floristic quality assessment of one natural and three restored wetland complexes in North Dakota, USA.  Wetlands 22(1):126-138.

This resource should be cited as:

Mushet, David M., Ned H. Euliss, Jr., and Terry L. Shaffer.  2002.  Floristic quality assessment of one natural and three restored wetland complexes in North Dakota, USA.  Wetlands 22(1):126-138.  Jamestown, ND: Northern Prairie Wildlife Research Center Online.  http://www.npwrc.usgs.gov/resource/wetlands/ndwetlnd/index.htm  (Version 04SEP2003).


Table of Contents

Figures and Tables


David M. Mushet, Ned H. Euliss, Jr., and Terry L. Shaffer, U.S. Geological Survey, Northern Prairie Wildlife Research Center, 8711 37th St. SE, Jamestown, North Dakota, USA 58401-7317.

Downloading Instructions -- Instructions on downloading and extracting files from this site.

(Download) ndwetlnd.zip ( 88K) -- Floristic Quality Assessment of One Natural and Three Restored Wetland Complexes in North Dakota, USA

Installation: Extract all files and open index.htm in a web browser.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/wetlands/ndwetlnd/index.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:59:00 EST
Sioux Falls, SD [sdww54]