Mallard recruitment in the agricultural environment of North Dakota
作者： L.M. Cowardin , D.S. Gilmer , C.W. Shaiffer
DOI:
关键词: Agriculture 、 Geography 、 Agroforestry 、 Environmental protection
摘要: Recruitment of a mallard (Anas platyrhynchos) population was assessed on a $10,041{\rm -}{\rm km}^{2}$ study area in central North Dakota during 1977-80. We equipped 338 hens …
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