Your search for keyword(s) "waterfowl" resulted in 6 record(s).

Title: Cattle grazing and avian communities of the St. Lawrence River Islands: Journal: Journal of Range Management; Authors: L. Belanger, and M. Picard; Date: 1999; Summary: A two-year study examined the effect of three grazing intensities on habitat selection of passerines and nest selection of waterfowl along the St. Lawrence River in Quebec. Three islands with different grazing intensities (Barques Island-no grazing, Moine Island-moderate and Ronde Island-intensive) were studied. Vegetation measurements were taken in late May to early June while the duck nest survey was conducted from mid-May to early June. The passerine bird survey was conducted during the first two weeks of June. ...; Agrovoc Control Words: Grazing, Wildlife, Birds; View more details about this article

Title: The impact of vertebrate herbivores on wetland vegetation in Atchafalaya Bay, Louisiana: Journal: Estuaries and Coasts; Authors: D. E. Evers, C. E. Sasser, J. G. Gosselink, D. A. Fuller, and J. M. Visser; Date: 1998; Summary: The effects of herbivory by waterfowl and nutria were measured because of vegetation loss in Sagittaria spp. dominated marshes along the coast of Louisiana. One set of study plots was set up on islands in Atchafalya Delta (fall 1985), while the other set was established on islands in Wax Lake Delta (winter 1986). Each set of plots included an exclosure that barred just nutria, one that barred just waterfowl, one that barred both, and an open grazing plot. Aboveground biomass and species composition were measured at the end of the growing season in 1986 and 1987. Belowground biomass was collect ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Adaptations to and consequences of an herbivorous diet in grouse and waterfowl: Journal: The Condor; Authors: J. S. Sedinger; Date: 1997; Summary: This review looks at diet selection in grouse and waterfowl in the context of their herbivorous diets and discusses adaptations to herbivory in these groups. Grouse eat plant foods containing lower concentrations of protein than foods of waterfowl, especially during the breeding season. Several species of grouse and small waterfowl (ducks) eat invertebrates during periods of high protein requirement, such as growth or egg production. Grouse and waterfowl differ little from each other in the morphology of digestive structures. The principal exception is the ceca, which are 5 times as long i ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Response of nesting ducks to habitat management on the Monte Vista National Wildlife Refuge Colorado: Journal: Wildlife Monographs; Authors: D. W. Gilbert, D. R. Anderson, J. K. Ringelman, and M. R. Szymczak; Date: 1996; Summary: Gilbert et al. looked at the habitat requirements for nesting ducks, and how management practices effect nesting density and success on the Monte Vista National Wildlife Refuge (MVNWR) in southern Colorado. Cattle grazing, in a rest-rotation system (1 year on 3 years off), was practiced on the MVNWR from 1977-1990. Nest success of all species of ducks showed a negative correlation with grazing intensity. Rested pastures, that were grazed at 0.4 AUM/ha the year prior, saw a decrease in nests by 55% as compared to a decrease of 38% in pastures grazed at 0.2 AUM/ha the year prior. Gilbert et ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Effects of grazing and burning on densities and habitats of breeding ducks in North Dakota: Journal: Journal of Wildlife Management; Authors: A. D. Kruse, and B. S. Bowen; Date: 1996; Summary: The research of this study found that spring cattle grazing (Bos taurus) reduced gadwall (Anas strepera) and blue-winged teal (Anas discors) cover. Gadwall and blue-winged teal nest densities decreased substantially during the three consecutive years of spring grazing compared to the post-treatment years. This reduction may have been influenced not only by the loss in cover, but also by the presence of cattle during the two species' nest initiation period. Nest density was not reduced for mallards (Anas platyrhynchos&l ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Guild structure of a riparian avifauna relative to seasonal cattle grazing

Journal: Journal of Wildlife Management

Authors: F. L. Knopf, J. A. Sedgwick, and R. W. Cannon

Date: 1988

Summary: Knopf et al. found that summer cattle grazing has an adverse effect on the presence of certain willow-dependent songbirds. Pastures that have historical summer grazing no longer have the Willow flycatcher, Lincoln's sparrow and the White-crowned sparrow present. Yet in these same areas, birds like the American Robin, Brown-headed cowbird and the Red-winged blackbird have increased in density. One possible answer for the decrease in some songbirds is the fact that the main focus of the Arapaho National Wildlife Refuge is on waterfowl habitat, which requires large amounts of open space (oppos ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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