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Full-Text Articles in Social and Behavioral Sciences
Effects Of Weather On Habitat Selection And Behavior Of Mallards Wintering In Nebraska, Dennis Jorde, Gary Krapu, Richard Crawford, Miriam Hay
Effects Of Weather On Habitat Selection And Behavior Of Mallards Wintering In Nebraska, Dennis Jorde, Gary Krapu, Richard Crawford, Miriam Hay
USGS Northern Prairie Wildlife Research Center
Sex and age ratios, habitat selection, spatial characteristics, and time budgets of Mallards (Anas platyrhynchos) wintering on the Platte River in south central Nebraska were studied from mid-December to early April 197% 1980. The proportion of females and subadults in the population increased substantially from a cold to a mild winter. Radio-tagged Mallards shifted from riverine to canal roost sites during the coldest periods of the winter, seemingly because of more favorable microclimatic conditions there. Subadults ranged over larger areas during winter than did adults. Activity patterns varied with weather conditions, time of day, and habitat type. During …
Ecological Distribution And Crude Density Of Breeding Birds On Prairie Wetlands, Harold A. Kantrud, Robert E. Stewart
Ecological Distribution And Crude Density Of Breeding Birds On Prairie Wetlands, Harold A. Kantrud, Robert E. Stewart
USGS Northern Prairie Wildlife Research Center
Breeding populations of 28 species of wetland-dwelling birds other than waterfowl (Anatidae) were censused on 1,321 wetlands lying within the prairie pothole region of North Dakota. Ecological distribution and two crude measures of relative density were calculated for the 22 commonest species using eight wetland classes. Semipermanent wetlands supported nearly two-thirds of the population and were used by all 22 species, whereas seasonal wetlands contained about one-third of the population and were used by 20 species. Semipermanent, fen, and temporary wetlands contained highest bird densities on the basis of wetland area; on the basis of wetland unit, densities were highest …
Habitat Use By Migrant Sandhill Cranes In Nebraska, Gary Krapu, Douglas Facey, Erik Fritzell, Douglas Johnson
Habitat Use By Migrant Sandhill Cranes In Nebraska, Gary Krapu, Douglas Facey, Erik Fritzell, Douglas Johnson
USGS Northern Prairie Wildlife Research Center
The principal spring staging areas of the midcontinent population of sandhill cranes (Grus canadensis) are along the Platte and North Platte rivers in south-central Nebraska. Most of these lands are privately owned and managed for corn and cattle production. Diurnal habitat use by radio-tagged cranes was primarily in cropland (55%), native grassland (28%), and tame hayland (15%). Ninety-nine percent of the cropland use was in cornfields; 55% as grazed stubble, 36% as disced, cultivated, and plowed stubble, 7% as ungrazed stubble, and 1% unclassified. Grazed pastures accounted for 93% of the grassland locations and mowed alfalfa fields 77% …