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Full-Text Articles in Social and Behavioral Sciences
The Effect Of Variable Spring Water Conditions On Mallard Reproduction, Gary Krapu, Albert Klett, Dennis Jorde
The Effect Of Variable Spring Water Conditions On Mallard Reproduction, Gary Krapu, Albert Klett, Dennis Jorde
USGS Northern Prairie Wildlife Research Center
Mallard (Anas platyrhynchos) breeding densities in the prairie pothole habitat of eastern North Dakota during 1961-1980 varied from 2.28 birds/km2 in 1977 to 9.47 birds/ km2 in 1963 and were correlated with pond abundance (r = 0.543, P < 0.05). The number of basins used by pairs declined with drought, as did home-range size. Nesting activity also varied with the number of ponds holding water/km2, ranging from high (including substantial renesting) under favorable water conditions to low during extreme drought. The span between first and last nest initiations declined by 19 days from a wet to a dry year. With severe drought conditions during spring 1977 on the Medina Study Area, pairs returned to attempt nesting but were unsuccessful, and most …
Breeding Birds Of Wooded Draws In Western North Dakota, Craig A. Faanes
Breeding Birds Of Wooded Draws In Western North Dakota, Craig A. Faanes
USGS Northern Prairie Wildlife Research Center
Wooded draws represent a unique vegetative community within the northern Great Plains. Because of their limited extent over broad areas of grasslands, wooded draws offer potentially diverse breeding areas for a large array of birds and mammals. Seabloom et al. (1978) reported that although wooded habitats made up only 8.6% of their area sampled in southwestern North Dakota, nearly 33% of the observed vertebrate fauna occupied wooded habitats.
Little information is available on vertebrate communities in wooded vegetation of western North Dakota. Hopkins (1980) studied the breeding avifaunas of several habitat types in Theodore Roosevelt National Park. Hiemenz and Cassel …
Survival Of Mallard Broods In South-Central North Dakota, Larry Talent, Robert Jarvis, Gary Krapu
Survival Of Mallard Broods In South-Central North Dakota, Larry Talent, Robert Jarvis, Gary Krapu
USGS Northern Prairie Wildlife Research Center
Survival characteristics of 25 broods of Mallards (Anas platyrhynchos) were determined on a study area in the Missouri Coteau of south-central North Dakota in 1976-1977. Radio-equipped Mallard hens fledged at least one duckling in 7 of 16 (44%) broods produced in 1976, 5 of 9 (55%) in 1977, and 12 of 25 (48%) for both years combined. Of the 13 broods in which all young were lost, 11 (85%) were lost within the first two weeks after hatching. All losses of entire broods occurred in wetlands; few ducklings and no entire broods were lost during overland travel. Predation …
Avian Associations Of The Northern Great Plains Grasslands, Harold A. Kantrud, Russell L. Kologiski
Avian Associations Of The Northern Great Plains Grasslands, Harold A. Kantrud, Russell L. Kologiski
USGS Northern Prairie Wildlife Research Center
The grassland region of the northern Great Plains was divided into six broad subregions by application of an avian indicator species analysis to data obtained from 582 sample plots censused during the breeding season. Common, ubiquitous species and rare species had little classificatory value and were eliminated from the data set used to derive the avian associations. Initial statistical division of the plots likely reflected structure of the dominant plant species used for nesting; later divisions probably were related to foraging or nesting cover requirements based on vegetation height or density, habitat heterogeneity, or possibly to the existence of mutually …
Book Review: Animal Population Dynamics, Douglas H. Johnson, James W. Grier
Book Review: Animal Population Dynamics, Douglas H. Johnson, James W. Grier
USGS Northern Prairie Wildlife Research Center
This booklet is one of a series offered by the publisher as an alternative to a single textbook in ecology. Each is intended to be a self-contained and concise summary of some topic in ecology. This one attempts to cover a major subject in a few small (13 x 22 cm) pages. It achieves but limited success.