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Providing evidence to improve practice

Individual study: Anecdotal evidence suggests that, although grackles and wood ducks may not compete for nestboxes, grackles are important predators on wood duck clutches

Published source details

Spero V.M. & Pitts T.D. (1984) Use of Wood Duck Nest Boxes by Common Grackles. Journal of Field Ornithology, 55, 482-283


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

Provide artificial nesting sites for songbirds Bird Conservation

A small single-site study from March-May in 1981-1982 in an island (1.2 ha) within Kentucky Lake in Tennessee, USA (Spero & Pitts 1984) found that common grackles Quiscalus quiscula nested in 20-21% of nest boxes provided, fledging 71% of nestlings, which was higher than in other areas (average of 27%). This study also discusses the use of nest boxes by wood ducks Aix sponsa.

 

Provide artificial nesting sites for wildfowl Bird Conservation

A small single-site study from March-May in 1981-1982 in an island (1.2 ha) within Kentucky Lake in Tennessee, USA (Spero & Pitts 1984) found that wood ducks Aix sponsa nested in 44-63% of the nest boxes provided although in 1982, 11 of 44 wood duck nests were destroyed, probably by common grackles Quiscalus quiscula and nestlings in one nest were preyed upon by grackles. According to the authors, the presence of vacant nest boxes in both years suggests that grackles and wood ducks were not competing for nest sites. This study also discusses the use of nest boxes by grackles.