Selected Birds of the Boreal Forest of North America


Ring-necked Duck, male

Ring-necked Duck, male
© Kathy Lindstrom
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Migration pattern of the Ring-necked Duck.

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Arrows represent general migration routes. The arrows do not necessarily link specific breeding and wintering grounds.

Ring-necked Duck

Aythya collaris

The Ring-necked Duck is misleadingly named for the chestnut coloured ring around the black neck of the breeding male, which is barely visible when identifying birds in the field. This species is sometimes mistaken for some of its diving duck relatives, like Lesser and Greater Scaup, but there are key differences to distinguish them. A breeding male Ring-necked Duck’s black back, white triangle in front of the folded wing, angular shaped head, white bars on the bill, and uniformly dark wings contrast with the grey back, rounded head, plain bill, and white line on the wing of the Scaup. The female closely resembles Scaup and Redhead females, with the exception of an angular head, white band near the bill tip, and white-eye ring. The Ring-necked Duck predominately breeds in the western boreal forest, and is dependent on boreal wetlands for its continued reproductive success.

Habitat:

Unique to diving ducks, Ring-necked Ducks prefer shallow wetlands fringed with emergent, submerged or floating vegetation like wild celery, bulrush, pondweed and pond lily. They are generally shallow divers when feeding, so do not require deep water. Unlike many other divers, the Ring-necked Duck can take off from a puddle without having to run along the water’s surface, and flies swiftly and erratically in small compact groups – possibly a result of the small woodland wetlands it inhabits during breeding. Wintering Ring-necked Ducks can be found on wild rice lakes or other shallow wetlands rich with submerged or emergent plants.

Diet/Feeding Behavior:

Feeding by shallow dives, as well as dabbling at or just under the surface, Ring-necked Ducks are more generalized feeders than other diving ducks. They eat mostly plant matter like seeds and tubers of submerged vegetation, but also feed on snails, insects, leeches, and other aquatic invertebrates. The diet varies for females during high energy cost periods, such as egg production and nesting, when they will consume more protein rich invertebrates. Young ducklings depend on animal matter exclusively, but as they reach maturity they gradually shift to a diet made up of mostly plants.

Breeding:

The core breeding area is within the closed boreal forest of the Northwest Territories, Alberta, Saskatchewan and Manitoba. The eastern boreal region of Canada and the U.S. also contains key breeding areas, but not in the numbers observed in the west. Year-round resident birds breed as far south as California, Colorado and Arizona. The prairie pothole region is largely avoided by breeding Ring-necked Ducks. Pair bonding usually occurs during spring migration, so unpaired ducks arriving on the breeding grounds are likely non-breeders.

Females build nests over water in emergent vegetation on wetland fringes, usually consisting of sedges and woody plants like leatherleaf. When a female Ring-necked Duck first begins laying eggs, she will have built a loose platform of nest material, which develops in size and structure as laying proceeds. When they are completed, nests require constant maintenance to prevent flooding. An average of 9 eggs are laid, and are incubated for 25-29 days. The male may accompany the female from feeding areas to the nest during egg laying, but does not stay to defend the nest, and the pair bond abates soon after she starts incubating. There is no evidence of territoriality in this species, and even ducklings are the most docile of all diving ducks. The female hides her brood in emergent vegetation along the wetland edge, unlike other diver broods that are commonly seen in open water.

Migration/Winter Range:

Ring-necked Ducks are midseason migrants, arriving to the breeding grounds from late March and mid-May, depending on the destination. Fall migration occurs from late September to early December. Males are first to depart in the fall, with females and young following. The bulk of travel takes place at night in smaller flocks than most other duck species form. They migrate inland, to wintering areas stretching from the Pacific, Gulf, and southern Atlantic states, as far as central Mexico and the Caribbean.

Conservation Issues and Status:

Estimates of populations, survival and recovery rates are imprecise, making it difficult to understand the status of this species. Population surveys can be complicated due to Ring-necked Ducks’ similarity in appearance to Scaups, so there is a shortage of information regarding annual population changes. Recent surveys do not indicate a large deviation from the long-term population trend, so there is currently not much concern for the health of this species. Loss of breeding habitat, a dilemma for many prairie-nesting ducks, may not be as much of an issue for Ring-necked Ducks at present, since woodland wetlands are at lower risk for widespread development like drainage for agriculture. Contamination risks are also lower than those for prairie-nesters because they are less likely to be exposed to agricultural chemicals. Ring-necked Ducks appear to be particularly susceptible to lead toxicity, as they have a high lead shot ingestion rate. Although lead shot has been banned in North America for several years, residual shot in wetland habitats from pre-ban times may remain a problem for this species.

References:

  • Bellrose, F.C. 1980. Ducks, geese, and swans of North America. Rev. ed. Stackpole Books, Harrisburg, PA.
  • Hohman, W.L., and R.T. Eberhardt. 1998. Ring-necked Duck. In The Birds of North America, No. 329 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists' Union.
  • Wilkins, K.A. and M.C. Otto. 2003. Trends in Duck Breeding Populations, 1955-2003. Administrative report. U.S. Fish and Wildlife Service, Division of Migratory Bird Management, Laurel, MD.
  • USGS Patuxent Wildlife Research Center. 2003. The North American Breeding Bird Survey, Results and Analysis 1966 - 2003. Version 2003.1 (Draft). USGS Patuxent Wildlife Research Center, Laurel, MD, USA
  • Nelson, C.G. 1993. The Downy Waterfowl of North America. Delta Station Press, Deerfield, IL and Portage la Prairie, MB.

Birding content provided by National Wildlife Federation/eNature with support from Ducks Unlimited/The Pew Charitable Trusts

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