Predator removal coincides with, but does not correlate with, higher nest success in duck species

  • Published source details Sargeant A.B., Sovada M.A. & Shaffer T.L. (1995) Seasonal Predator Removal Relative to Hatch Rate of Duck Nests in Waterfowl Production Areas. Wildlife Society Bulletin, 23, 507-513


This study is summarised as evidence for the following.

Action Category

Control predators not on islands for wildfowl

Action Link
Bird Conservation
  1. Control predators not on islands for wildfowl

    A replicated, randomised, paired site study from May-June in 1987-1990 in 15 pairs of waterfowl production areas (61-201 ha) consisting of equal wetland and grassland habitats in Minnesota and North Dakota, USA (Sargeant et al. 1995), found that four duck species exhibited higher nest success and daily survival rate in sites where predators were removed. Mean daily survival rate of nests was significantly higher in predator-removal sites than control sites (0.94 compared to 0.91). Mean hatching rate was 13.5% for predator-removal sites and 5.6% for control sites but there was considerable variation in both treatments (1-58% and 1-62% respectively). Nest predation rate was significantly lower in predator-removal sites than control sites (91% compared to 96%). However, hatch rate was not correlated to the number of predators removed. Ducks species analysed were mallard Anas platyrhynchos, blue-winged teal Anas discors, gadwall Anas strepera and northern pintail Anas acuta.


Output references

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, terrestrial mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 18

Go to the CE Journal

Subscribe to our newsletter

Please add your details if you are interested in receiving updates from the Conservation Evidence team about new papers, synopses and opportunities.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust