Folders: ROOT > ScienceBase Catalog > Northern Prairie Wildlife Research Center > Waterfowl and Other Waterbirds ( Show all descendants )
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The continental population of scaup ( Aythya affinis and A. marila) fell to >30% below the 1955-2008 average, and ~3 million birds below the North American Waterfowl Management Plan (NAWMP) goal of 6.3 million. Reviews of long-term databases noted a decrease in the sex and age ratios (number of females relative to males and number of immatures relative to adults, respectively) of lesser scaup in the U.S. harvest. These results indicate that recruitment and female survival of lesser scaup has declined during this period. Recruitment is the product of several demographic rates, including female survival during the breeding season, breeding propensity, nesting success, and duckling survival. Previous life-cycle models...
Categories: Project
Population size and trends of most North American marsh bird species are poorly known, and continental marsh bird surveys are being proposed to provide better insight into marsh bird populations. The Prairie Pothole Region (PPR) is a critical and expansive breeding area for several focal marsh bird species (Beyersbergen et al. 2004). The study described here supports development of a regional and national monitoring program by furnishing data that can be used to develop models that relate roadside counts of marsh birds in the PPR to counts obtained from off-road sites for which access is more difficult. Roadside surveys (i.e. point-count surveys conducted from the road right-of-way) are being considered as a technique...
Categories: Project
In 1987, the U. S. Fish and Wildlife Service, Regions 3 and 6 initiated a survey to annually assess the size and productivity of waterfowl populations, and measure wetland habitat conditions within Wetland Management Districts (WMD) in North Dakota, South Dakota, Minnesota, and northeastern Montana. The original impetus for the survey resulted from the FWS Directorate's desire to improve the monitoring of migratory birds and to obtain consistency among National Wildlife Refuge (NWR) waterfowl surveys. The survey, called the "Four-Square-Mile (FSM) Survey" was developed by statisticians and biologists from Northern Prairie Wildlife Research Center and relied on ground pair counts in combination with aerial videography...
Categories: Project
Spring migration is a key portion of the annual cycle for waterfowl due to its proximity to the breeding period and for the potential for resource limitation during this time. Research during spring has lagged behind other periods of the annual cycle, despite the potential for events during spring to influence successful reproduction. Arctic-nesting geese rely heavily on nutrient reserves (lipid and protein) accumulated during spring migration for egg laying and/or incubation. Nesting pintails rely on endogenous lipids to greater degree than other ducks, and lipid dynamics prior to arriving at breeding areas may influence initiation of nesting, clutch size, and other aspects of recruitment in pintails. The Rainwater...
Categories: Project
Categories: Project
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