Conservation Evidence strives to be as useful to conservationists as possible. Please take our survey to help the team improve our resource.

Providing evidence to improve practice

Individual study: Predator removal increases nest survival in dabbling ducks Anas spp. in farmland in North Dakota, USA

Published source details

Garrettson P.R. & Rohwer F.C. (2001) Effects of mammalian predator removal on production of upland-nesting ducks in North Dakota. The Journal of Wildlife Management, 65, 398-405


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Control predators not on islands for wildfowl Bird Conservation

A randomised, replicated and controlled study in northern North Dakota, USA, in 1995-6 (Garrettson & Rohwer 2001) found that survival rates of dabbling duck Anas spp. nests was higher on eight mixed agriculture and wetland sites (each 41.5 km2) with predator removal than on eight sites without predator removal (42% survival for 1,584 nests vs. 23% for 1,122). Trapping and shooting removed 2,404 predators between 1994 and 1996, most of which were raccoons Procyon lotor, striped skunks Mephitis mephitis and red fox Vulpes vulpes.