Use of small rock islands as nesting sites for Canada Geese. GF Giroux

CD# 2 file GIR013.PDF

Small rock islands (<30 m) were evaluated as nesting sites for Canada geese (Branta canadensis) in Alberta and Saskatchewan from May to July 1979. Thirty (31%) of 96 islands were used for nesting, and nest success averaged 73%. These figures are comparable to those reported for other artificial nest sites. Islands used by geese were older, farther from shore, has a larger nesting area, and had more nesting material than unused islands. Islands should be constructed in wetlands that have 2 or more ha of open water, a firm basing substrate, and stable water levels.Within the wetland, they should be located at least 45 m from shore in a minimum depth of 40 cm, and spaced 100 m apart. Islands should be constructed with rocks about 15 cm in diameter, approximately 80 cm high, and with a nesting area (top of islands) of at least 1.5 m in diameter. Nesting material can be provided by placing straw on the top of the islands or preferably in a large tire (50 cm in diameter). Soil can also be