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Full-Text Articles in Social and Behavioral Sciences
Effects Of Redhead Nest Parasitism On Mallards, Larry Talent, Gary Krapu, Robert Jarvis
Effects Of Redhead Nest Parasitism On Mallards, Larry Talent, Gary Krapu, Robert Jarvis
USGS Northern Prairie Wildlife Research Center
Female Redheads (Aythya americana) are known to deposit eggs in nests of Mallards (Anas platyrhynchos). Joyner (J. Wildl. Manage. 40:33-38, 1976) attributed a high rate of Redhead parasitism on Mallard nests at Farmington Bay, Davis Co., Utah, to crowding of host and parasite into the same habitat. Weller (Ecol. Monogr. 29:333365, 1959) stated that at Knudson Marsh, Utah, only a few deep channels and patches of water were suitable for feeding and courtship by Redheads, and nests of other ducks located near those areas were heavily parasitized; nests farther from the shore were parasitized less often. …
The Platte River Ecology Study: Special Research Report', Northern Prairie Wildlife Research Center
The Platte River Ecology Study: Special Research Report', Northern Prairie Wildlife Research Center
USGS Northern Prairie Wildlife Research Center
Each spring about 80%of the sandhill cranes in North America stop for several weeks in the Platte and North Platte River Valleys of Nebraska while en route to breeding grounds in Canada, Alaska, and the Soviet Union. This concentration of cranes is unparalleled in North America and these sites represent the principal spring staging areas for the midcontinent population. Large numbers of waterfowl, numerous bald eagles, whooping cranes, and many other species also use the area.
Recent changes in habitat conditions along the Platte and North Platte Rivers have prompted concern for the welfare of sandhill cranes and other migratory …
The Role Of Nutrient Reserves In Mallard Reproduction, Gary Krapu
The Role Of Nutrient Reserves In Mallard Reproduction, Gary Krapu
USGS Northern Prairie Wildlife Research Center
Mallard (Arias platyrhynchos) populations breeding in temperate North America obtain a significant part of the energy and lipid requirements of reproduction at sites occupied prior to arrival on the breeding grounds. Protein for egg formation, however, is obtained principally from the diet during the nesting period. Both sexes arrive heavy and fat in North Dakota but experience substantial weight loss and lipid depletion during the nesting cycle. Weight loss is most pronounced among females and averages 25% from prelaying to late incubation. Body weights of both sexes are positively correlated with carcass lipid content. The paired male draws …
Determination Of Age And Whelping Dates Of Live Red Fox Pups, Alan B. Sargeant, Stephen H. Allen, Douglas H. Johnson
Determination Of Age And Whelping Dates Of Live Red Fox Pups, Alan B. Sargeant, Stephen H. Allen, Douglas H. Johnson
USGS Northern Prairie Wildlife Research Center
Public concern for large carnivores, high longhair fur prices, and recent findings of predator-prey investigations have increased interest in the management of red foxes (Vulpes vulpes). A technique for assigning individuals to age-classes is necessary to understand the population dynamics and behavioral interactions of this species.