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Full-Text Articles in Social and Behavioral Sciences
Patch Size And Landscape Effects On Density And Nesting Success Of Grassland Birds, Maiken Winter, Douglas H. Johnson, Jill A. Shaffer, Therese M. Donovan, W. Daniel Svedarsky
Patch Size And Landscape Effects On Density And Nesting Success Of Grassland Birds, Maiken Winter, Douglas H. Johnson, Jill A. Shaffer, Therese M. Donovan, W. Daniel Svedarsky
USGS Northern Prairie Wildlife Research Center
Cumnt management recommendations for grassland birds in North America emphasize providing large patches of grassland habitat within landscapes that have few forest or shrubland areas. These Bird Conservation Areas are being proposed under the assumption that large patches of habitat in treeless landscapes will maintain viable populations of grassland birds. This assumption requires that patch size and landscape features affect density and nesting success of grassland birds, and that these effects are consistent among years and regions and across focal species. However, these assumptions have not yet been validated for grassland binls, and the relative importance of local vegetation structure, …
Habitat And Nesting Of Le Conte's Sparrows In The Northern Tallgrass Prairie, Maiken Winter, Jill A. Shaffer, Douglas H. Johnson, Therese M. Donovan, W. Daniel Svedarsky, Peter W. Jones, Betty R. Euliss
Habitat And Nesting Of Le Conte's Sparrows In The Northern Tallgrass Prairie, Maiken Winter, Jill A. Shaffer, Douglas H. Johnson, Therese M. Donovan, W. Daniel Svedarsky, Peter W. Jones, Betty R. Euliss
USGS Northern Prairie Wildlife Research Center
ABSTRACT. Little is known about the breeding biology of the Le Conte's Sparrow (Ammodramus leconteil), probably because of its secretive nature. We provide new information on several aspects of Le Conte's Sparrow breeding biology, including rates of nest parasitism by Brown-headed Cowbirds (Molothrus ater) and potential factors affecting breeding densities and nesting success of the species. Our study was conducted in the tallgrass prairie of northwestern Minnesota and southeastern North Dakota during 1998-2002. Breeding densities varied among years, but this variation was not clearly linked to climatic patterns. Vegetation had some influence on densities of Le …