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Density of suitable wood duck nest cavities in a northern hardwood forest

G.J. Soulliere

Document Type

Article

Journal/Book Title/Conference

Journal of Wildlife Management

Volume

52

Issue

1

First Page

86

Last Page

89

Publication Date

1988

Abstract

The density of natural cavities suitable for wood duck (Aix sponsa) nesting, and the relative importance of cavity and potential cavity tree species were determined in a second growth hardwood forest in central Wisconsin. Suitable cavity density averaged 0.65/ha, with silver maple (Acer saccharinum), sugar maple (A. saccharum), quaking aspen (Populus tremuloides), and American basswood (Tilia americana) containing suitable cavities. These 4 species, which typically occur in Wisconsin's wet-mesic and mesic woodlands, were of highest importance in the forest's composition of large (≥31 cm diameter breast ht [dbh]) trees. Although the density of suitable wood duck nest cavities was not high, cavities are nevertheless abundant because large areas of forest are available for wood duck nesting. Numbers of cavities should increase as Wisconsin's second growth forests continue to mature. Wildlife managers will have a greater impact on wood ducks by advising on forestry operations, rather than actively providing nest sites.

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