1999 · 71 citations · 42 references
Life SciencesConservation BiologyEcologyOrnithologyPopulation EcologyWildlife ManagementBird ConservationBird Population BiologyDroughtDrought Disturbance EcologyDrought EcologyDrought Impact AssessmentBaseline Habitat ConditionsBreeding Population ManagementBreeding Population RepresentationRegional Precipitation PatternsWaterfowl ConservationWaterfowl EcologyWetland Breeding EcologyWetland Population Dynamics
The number of northern pintails (Anas acuta) in North America continues to be low despite substantially improved wetland habitat conditions as recorded by the May Breeding Population and Habitat Survey (May Survey, United States Fish and Wildlife Service [USFWS] 1998; Figure 1). In 1993-97, following extended drought during the 1980s and early 1990s, favorable precipitation patterns returned to the critical waterfowl nesting areas of the northern Great Plains of the United States (U.S.) and Canada (USFWS 1997), the area known as the Prairie Pothole Region (PPR, Bellrose 1980). Historically, when the number of wetlands (May ponds) counted on the May Survey increased in the PPR, pintail breeding populations (BPOP) also increased (e.g., Smith 1970). However, even though May ponds attained record high levels in
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The Ducks, Geese, and Swans of North America
Paul M. Scheffer, Francis H. Kortright · The Murrelet · 1943 · 1.2K citations
The role of nutrient reserves in mallard reproduction
Gary L. Krapu · Lincoln (University of Nebraska) · 1981 · 350 citations · Full text