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Providing evidence to improve practice

Individual study: Supplementary food has a limited impact on reproductive success in American coots Fulica americana in Manitoba, Canada

Published source details

Arnold T.W. (1994) Effects of supplemental food on egg production in American coots. The Auk, 111, 337-350


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

Provide supplementary food for rails and coots to increase reproductive success Bird Conservation

A randomised, replicated and controlled study in wetlands in Manitoba, Canada, in 1987-9 and 1991 (Arnold 1994), found that American coots Fulica americana laid clutches significantly earlier and had significantly larger clutches when provided with supplementary food (steam-rolled corn and commercial rabbit food), compared with control (unfed) pairs (average of May 5th for first laying date for fed 309 pairs vs. May 7th for 386 unfed pairs). However supplementary food did not affect egg size or laying rate and the authors note that feeding only accounted for 1% and 3% of the variation in laying date and clutch size respectively. No data was presented on the hatching rate or survival of chicks.