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Distribution and Abundance of Predators that Affect Duck Production--Prairie Pothole Region

Alan B. SargeantMarsha Ann SovadaRaymond J. GreenwoodTerry L. Shaffer

出版	United States Department of the Interior, Fish and Wildlife Service, 1993
URL	http://books.google.com.hk/books?id=vi8oinNXBvQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋

During the period 1983 to 1988, the relative abundance of 18 species--groups of mammalian and avian predators affecting duck production in the prairie pothole region was determined in 33 widely scattered study areas ranging size from 23 to 26 square km.