Molt and the basic plumage of male harlequin ducks

Article Abstract:

Changes in plumage among 28 male harlequin ducks were observed between June and November. During this time, the avians transformed from the alternate plumage through pre-basic molt into the basic plumage before going through the pre-alternate molt into their new alternate plumage. Visible white tertial feathers which appear during the start of the basic plumage is hypothesized as a badge of quality and a sexual signal to other birds.

Feathers

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The timing of pair formation in Harlequin ducks

Article Abstract:

Pair formation in wintering Harlequin ducks, Histrionicus histrionicus, takes place from October to December, much earlier than ducks with similar size. Further, former mates usually pair with each other on succeeding breeding seasons if they happen to return to the same wintering grounds. Pair reunion serves to reduce costs related to courtship. Young males and females form new pair bonds in the spring.

Sexual behavior, Courtship of animals, Mating behavior

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Time-activity budgets of Harlequin Ducks molting in the Gannet Islands, Labrador

Article Abstract:

Research is presented concerning the time spent molting by Harlequin Ducks in the Gannet Islands, Canada. Resting occupied 53.5% of time, time spent out of water was 61.4% and foraging time was 11.5%. The time-activity budgets of the ducks are discussed.

Time management

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