Goldeneye (Bucephala clangula) Science Article 2 abstract We studied nest prospecting by Common Goldeneye (Bucephala clangula) females in north-central Minnesota. Adults unsuccessful in nesting, those with broods, and nonnesting yearlings were captured in nests while prospecting. Prospecting began in late May and continued into early July. Active nests received up to 25 prospecting visits per […]

Goldeneye (Bucephala clangula) Science Article 1 abstract Brood parasitism as an alternative female breeding tactic is particularly common in ducks, where hosts often receive eggs laid by parasitic females of the same species and raise their offspring. Herein, we test several aspects of a kin selection explanation for this phenomenon in goldeneye ducks (Bucephala clangula) […]

Goosander (Mergus merganser) Science Article 1 abstract Moulting Goosanders were counted on the Eden estuary, Fife, UK from 1979 to 1994, and some of these birds were caught and wing-tagged from 1992 to 1994. This paper documents changes in numbers of moulting birds, and their provenance, as determined from subsequent sightings. Goosanders only started to […]

Fulvous Tree-Duck (Dendrocygna bicolor) Science Article 1 abstract Mr. Wanzer states that Dendrocygna fulva was first brought to his notice in June 1895, and that they have returned each subsequent season, arriving about the first of June, and that they did not seem to increase until about 1898, but since that time have increased withsuch […]

Garganey (Anas querquedula) Science Article 1 abstract Most species of long-distance migratory birds put on energy stores to fuel their travels. However, recent studies have highlighted the potential costs associated with carrying too much fuel, either through increased predation risk or decreased .ight e.ciency. Consequently, it is now widely accepted that migratory birds should carry […]

Eider (Somateria mollissima) Science Article 5 abstract The energetic costs of salt turnover were measured in Common Eiders Somateria mollissima by respirometry. Rates of salt intake in the field were estimated from salt content of their chief prey, the mussel Mytilus edulis. Metabolic rate in Eiders increases in response to salt intake and may double […]

Eider (Somateria mollissima) Science Article 2 abstract Based on data compiled from the official Danish Bag Record and from the annual wing surveys of waterfowl, analyses of long-term trends in the bag of common eiders Somateria mollissimawere performed for the period 1958-2000, while more detailed analyses of factors affecting bag size were made for the […]

Eider (Somateria mollissima) Science Article 7 abstract We implanted satellite transmitters to track Northern Common Eiders Somateria mollissima borealis from breeding grounds in West Greenland and eastern Arctic Canada, and from their wintering grounds in southwest Greenland. We compared distances moved, timing, duration, and patterns of movement between migration flyways and between spring and autumn […]

Eider (Somateria mollissima) Science Article 6 abstract In the present study we have made observations of eye closure duration of Common Eider Somateria mollissima in the field, to determine the amount of time devoted to sleep during the incubation period, both in breeding and non-breeding females. Breeding females started to incubate with a higher level […]

Eider (Somateria mollissima) Science Article 3 abstract In the common eider Somateria mollissima as well as in many other bird species, nesting success has been associated with female reproductive characteristics and predator accessibility to the nest site. In this study, we tested the following predictions on nesting common eiders: 1) female and nest-site characteristics are […]