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Temporal Effects Of Grazing Regimes On Non-Game Birds In North Dakota Grasslands, Eric D. Salo, Kenneth F. Higgins, William T. Barker, Kristel K. Bakker, Kent C. Jensen
Temporal Effects Of Grazing Regimes On Non-Game Birds In North Dakota Grasslands, Eric D. Salo, Kenneth F. Higgins, William T. Barker, Kristel K. Bakker, Kent C. Jensen
Proceedings of the North American Prairie Conferences
Grazing occurred naturally in the northern Great Plains and influenced many natural processes in grassland ecosystems, including the habitat selection of breeding birds. Grazing, mainly for livestock production, is still an important land use practice and is one that impacts millions of hectares on both public and private land in the United States. To better understand how long-term grazing treatments affect non-game breeding birds, a study was conducted at the Central Grasslands Research Extension Center (CGREC) in south-central North Dakota during 2001 and 2002 and results were compared to two earlier studies, one in native prairie and the other in …
Grazing Intensity Effects On Vegetation, Livestock And Non-Game Birds In North Dakota Mixed-Grass Prairie, Eric D. Salo, Kenneth F. Higgins, Bob D. Patton, Kristel K. Bakker, William T. Barker, Brian Kreft, Paul E. Nyren
Grazing Intensity Effects On Vegetation, Livestock And Non-Game Birds In North Dakota Mixed-Grass Prairie, Eric D. Salo, Kenneth F. Higgins, Bob D. Patton, Kristel K. Bakker, William T. Barker, Brian Kreft, Paul E. Nyren
Proceedings of the North American Prairie Conferences
We conducted studies in native prairie mixed-grass pastures in south~central North Dakota (U.S.A.) during 1989- 2003 to determine how different grazing intensities affected structural characteristics of vegetation, livestock production and the occurrence and density of grassland birds. Generally, as grazing treatment intensity increased from light to extreme, mean vegetation structural values decreased for visual obstruction readings, tallest plants of grasses, forbs, and shrubs, and litter depth. Nineteen species of non-game birds were detected during 2001 and 2002. Overall breeding bird densities were negatively affected by increasing levels of grazing intensity in mixed-grass prairie. Claycolored sparrows (Spizella pallida), grasshopper …
Could The Area-Sensitivity Of Some Grassland Birds Be Affected By Landscape Composition?, David Joseph Horn, Rolf R. Koford
Could The Area-Sensitivity Of Some Grassland Birds Be Affected By Landscape Composition?, David Joseph Horn, Rolf R. Koford
Proceedings of the North American Prairie Conferences
Several grassland bird species have been shown to be area sensitive. This area sensitivity occurs when a species' frequency of occurrence, or relative abundance, tends to be lower in smaller fields. The detection of area sensitivity, however, is not consistent among studies because a species may exhibit area sensitivity in one study, but not in another. We tested the hypothesis that a species' area sensitivity varies depending on the amount of grassland in the landscape. The study took place in central North Dakota during the 1996 and 1997 breeding seasons on 46 fields enrolled in the Conservation Reserve Program (CRP). …