The role of predator removal, density-dependence, and environmental factors on mallard duckling survival in North Dakota
作者： Courtney L. Amundson , Todd W. Arnold
DOI: 10.1002/JWMG.166
关键词: Animal science 、 Density dependence 、 Anas 、 Nest 、 Biology 、 Cumulative survival 、 Predator 、 Ecology (disciplines) 、 Ecology, Evolution, Behavior and Systematics 、 Nature and Landscape Conservation
摘要: ABSTRACT Duckling survival is an important component of mallard (Anas platyrhynchos) recruitment and population growth, yet many factors regulating duckling are poorly understood. We investigated affecting in the drift prairie northeastern North Dakota, 2006–2007. Mammalian meso-predators were removed by trapping on 4 92.3 km2 study sites another served as controls. monitored 169 broods using telemetry periodic resighting, we modeled cumulative to 30 days age (Ŝ30d) nest module Program MARK. was not affected predator removal (Ŝ30d-Control = 0.208, 85% CI: 0.182–0.234; Ŝ30d-Trapped 0.183, 0.155–0.211) only weakly negatively correlated with density. higher 2007 (Ŝ30d-2007 0.264, 0.193–0.355) than 2006 (Ŝ30d-2006 0.157, 0.084–0.252) increased total seasonal semipermanent wetland area declined ...
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