Study

Nest density and reproductive success of blue-winged teal Anas discors in response to grazing and hay-making, Union Slough National Wildlife Refuge, Iowa, USA

  • Published source details Burgess H.H., Prince H.H. & Trauger D.L. (1965) Blue-winged teal nesting success as related to land use. The Journal of Wildlife Management, 29, 89-95

Actions

This study is summarised as evidence for the following.

Action Category

Employ grazing in natural grasslands

Action Link
Bird Conservation
  1. Employ grazing in natural grasslands

    At Union Slough National Wildlife Refuge, Iowa, USA (Burgess et al. 1965), a replicated, controlled trial in 1959-1961 found that blue-winged teal Anas discors nests in grazed grasslands and hayfields had greater success rates than those in ungrazed areas (47% success for grazed areas vs. 46% in hayfields and 14% in ungrazed areas; a total of 111 nests were monitored). However, nesting density was higher in ungrazed areas (7 nests/ha) than in grazed areas (4 nests/ha) or hayfields (4/ha). Areas were moderately grazed (15 June-1 October), ungrazed, or hay-cut (July-August, after the main nesting period).  Most nests were in Kentucky bluegrass Poa pratensis and alfalfa Medicago sativa.

     

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