Northern Prairie Wildlife Research Center
The preceding recommendations are what we consider to be key, specific, items which could benefit the SNG prairie chickens. As a summary, we generally agree with Johnson and Knue's (1989:121) wrap-up in their chapter dealing with prairie chickens in North Dakota:
"the Sheyenne Grassland population has been the object of considerable study. The Grasslands are used primarily for grazing and haying, and different grazing and pasture management systems have been shown to have a direct bearing on the grouse population.
Pinnated grouse have been described as birds of the grassland; it is said that prairie chickens can be abundant only in areas with at least 35% permanent grassland. But this statement is somewhat misleading. A study in Missouri found that a region with a large relative percentage of permanent grassland did not necessarily guarantee a large pinnate population.
Quality of the grassland is important; and the needs of grouse in terms of grassland may be different at different times of the year. Recently the U.S. Forest Service and Montana State University completed a cooperative study on prairie chickens in the Sheyenne Grasslands. The study examined the habitat needs of prairie chickens during the crucial nesting and brood rearing season and during the winter.
From the Montana State University study and other studies, it appears that we cannot expect the prairie chicken to spread in any significant way outside the Sheyenne National Grasslands. The land surrounding the Grasslands is highly productive and very intensively farmed. Within the boundaries of the Grasslands, however, it does appear possible to maintain a viable population, and possibly increase it.
The prairie chicken population in the Grasslands first began to show increases when grazing in the Grasslands was changed from season-long grazing to some kind of rotational pasture management system, and when some of the meadows were burned in early spring. Why these changes had a salutary effect on prairie chickens was explained by the Montana State University study.
During the nesting season, prairie chicken hens tended to choose pastures which had been left unmowed and which were not being grazed. Nests in taller and denser vegetation were more successful. After nests were hatched, hens tended to stay in places that were relatively undisturbed1, or move to places less disturbed by cattle or mowing. Again, height and density of vegetation seemed to be of greatest importance.
Something similar was true during the winter months. During daylight hours and times of mild weather, prairie chickens remained in agricultural areas where high-energy food was available in the form of waste crops. During the night and in periods of bad weather, pinnates moved to areas of taller grasses which stood up well to winter conditions.
The implications for management of the Grasslands seems clear. The Sheyenne Grasslands represent our best chance in North Dakota for maintaining a population of prairie chickens, and management practices need to be such that prairie chickens can co-exist with cattle. The Montana State University study makes specific suggestions for rotational grazing systems, timed to allow spring growth of grass and better pinnate nest success. The study concludes that mowing patterns can be altered to improve the distribution of unmowed lowlands most preferred by brood hens, and that residual vegetation be increased for nesting and winter roosting. Burning and mowing can be beneficial for both pinnates and cattle, but care should be taken that it does not interfere with nesting or brood rearing. In addition, since the Grasslands hold the only significant population of pinnates, an effort could be made to favor pinnates over sharptails here by controlling shrubs."
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