Effects of Grazing Systems on Sharp-tailed Grouse Habitat

Effects of grazing systems on sharp-tailed grouse (Pedioecetes phasianellus jamesi) nesting and brooding habitats in the Little Missouri National Grasslands of southwestern North Dakota were evaluated. Three grazing allotments with deferred-rotation grazing systems and three allotments with season-long grazing systems were randomly selected for study. Fifty measurements of vegetation were taken using the height-density pole on line transects in each of three range sites; rolling grasslands, upland grasslands and lowland draws. Vegetation was sampled in late spring, summer and fall of 1976 and early spring of 1977. Average height-density of vegetation for the season-long grazing system was significantly greater than vegetation in the deferred-rotation system (P<0.01). Average visual obstruction readings (VOR) were 1.10 ± .02 for the season-long systems and 0.75±.02 for deferred-rotation systems. Grazing allotments utilizing the season-long grazing system had consistently higher VOR averages than allotments with the deferred-rotation system in all four sampling periods. Visual obstruction readings increased form late spring (1.15±.03) to summer (1.32±.03) and decreased in the fall (0.69±.03). The following early spring, VOR average decreased to 0.55±.03. Vegetation around six stock ponds each grazing system was measured on three line transects radiating from each pond. Fifty measurements of vegetation were taken in six 91.4 m segments during the summer and fall 1976. Visual obstruction readings of vegetation around ponds in season-long systems were significantly higher (P<0.05) than VOR of vegetation around ponds in deferred-rotation systems. Height and density of vegetation became uniform beyond 182.8 m from each pond edge. The use of the deferred-rotation grazing system may be detrimental to vegetation cover types used by sharptails for nesting and brooding. A re-evaluation of the range capacity ratings and land management techniques on the grasslands will benefit sharp-tailed grouse habitat in southwestern North Dakota.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis - Open Access

Discipline thesis:degree_discipline

Wildlife and Fisheries Science

Year

1978

Author dc:creator

• Mattise, Samuel N.

• Natural Resources and Conservation

Statement dc:rights

• <p>No Copyright - Non-Commercial Use Only<br /><a href="http://rightsstatements.org/vocab/InC-EDU/1.0/">http://rightsstatements.org/vocab/NoC-NC/1.0/</a></p>

Language dc:language

en

Repository record dc:identifier

https://openprairie.sdstate.edu/etd/173

OAI identifier oai:identifier

oai:openprairie.sdstate.edu:etd-1173