Breeds in freshwater wetlands, especially marshes, fens, and bogs that are generally shallow (<1.5 m deep), with fringes of flooded or floating emergents, predominantly sedges interspersed with other herbaceous vegetation and shrubs. Also utilizes open water zones vegetated with abundant submerged or floating aquatic plants (Hohman and Eberhardt 1998). In B.C., breeds from 300 to 1,200 m in elevation, primarily in freshwater lakes (Campbell et al. 1990).
Campbell, R. W., N. K. Dawe, I. McTaggart-Cowan, J. M. Cooper, G. W. Kaiser, and M. C. E. McNall. 1990. The Birds of British Columbia. Vol. 1 and 2, Nonpasserines. UBC Press, Vancouver, B.C.
Hohman, W. L. and R. T. Eberhardt. 1998. Ring-necked Duck (Aythya collaris). In The Birds of North America, Vol. 9, No. 329 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union.