| Titre : | Wildfowl 49(0) - 1999 |
| Type de document : | Bulletin |
| Paru le : | 00/00/0000 |
Dépouillements
Article
Nancy L. Staus, Auteur
The West Indian Whistling-duck is a sedentary species, endemic to the West Indies. Threatened by hunting, habitat destruction and introduced predators, the bird is classified as vulnerable by the International Union for the Conservation of Natur[...]
Article
Suzanne Carriere, Auteur ;
Rodger D. Titman, Auteur
Habitat use by mallard Anas platyrhynchos and American black duck Anas rubripes broods was studied in Abitibi, Quebec, on four shared wetlands in June-July 1988 and 1989. Average water levels were c. 0.5 m lower in 1988 than in 1989, changing th[...]
Article
Gila Paquette, Auteur ;
C. Davison Ankney, Auteur
American Green-winged Teal are the smallest North American Anas. Because of their small size and early nesting chronology, females may have little ability to use nutrient reserves for egg production or to meet subsequent costs of incubation. Thu[...]
Article
Margaret R. Petersen, Auteur ;
John F. Piatt, Auteur ;
Kimberly A. Trust, Auteur
The winter diet of Spectacled Eiders living in marine habitats is known only from two individuals described by Cottam (1939). Here we examine marine diets from 36 stomachs collected near St. Lawrence Island, Bering Sea, Alaska, during May-June i[...]
Article
Peter W. Mayhew, Auteur ;
David C. Houston, Auteur
Wigeon in winter have a specialised grazing behaviour which involves repeatedly returning to the same feeding areas of short grassland. Two experiments are described which examined their behavioural adaptations to this type of grazing. A study o[...]
Article
John M. Pearce, Auteur ;
Daniel Esler, Auteur ;
Andrei G. Degtyarev, Auteur
In 1994 and 1995 we investigated breeding biology and nest site habitat of Spectacled Eiders on two study areas within the coastal fringe of the Indigirka River Delta, Russia (71degree 20' N, 150degree 20' E). Spectacled Eiders were first observ[...]
Article
Hugh Boyd, Auteur
William Brotherston, watching Pink-footed Geese roosting at Fala Moor Loch and feeding on the north slopes of the Moorfoot Hills, Midlothian, Scotland, recorded changes in numbers in spring, the influences of weather and farming practices, sexua[...]
Article
Jeffrey L. Port, Auteur
The breeding behaviour of Speckled Teal; hereafter teal, in eastern Argentina, is influenced strongly by their preference for Monk Parakeet nest cavities. I observed a marked population (n = 337) on the Estancia Los Yngleses, province of Buenos [...]
Article
Paul L. Flint, Auteur ;
Christine L. Moran, Auteur ;
Jason L. Schamber, Auteur
We studied survival of adult female and duckling Common Eiders during brood rearing at two sites on the Yukon-Kuskokwim Delta, Alaska, in 1997. Duckling survival to 30 days of age was 19% +- 10% (95% CI). Seventy-three percent of radio-marked ad[...]
Article
Gavin M. Siriwardena, Auteur ;
Jeffrey M. Black, Auteur
Barnacle goose parents caring for four or more goslings devoted less time to foraging than did those with fewer offspring, and more time was spent being vigilant. Goslings gained substantial benefits from being in the family unit, including bett[...]
Article
J.-P. L. Savard, Auteur ;
A. Reed, Auteur ;
L. Lesage, Auteur
Brood amalgamation is frequent within the Tribe Mergini. We quantified amalgamation in the Surf Scoter (Melanitta perspicillata) by a combination of observations on marked and unmarked broods at Lake Malbaie, Quebec. Brood amalgamation was frequ[...]
Article
P. A. J. Hawkins, Auteur ;
P. J. Butler, Auteur ;
A. J. Woakes, Auteur
Five female Common Eider ducklings taken under licence from a population at the Isle of May, Firth of Forth, Scotland, were reared from eggs. Weekly measurements were made of the tibiotarsus, ulna, head, ninth primary, body mass, wing and foot a[...]
Article
Leif Nilsson, Auteur ;
Ove Andersson, Auteur ;
Rolf Gustafsson, Auteur ;
Mikael Svensson, Auteur
In the early decades of the 20th century the Whooper Swan was a rare breeding bird in northern Sweden, estimated at only 20 pairs. After protection from hunting in 1927, the population increased slowly and then more markedly after 1950. A large [...]
Article
Peter J. Whitehead, Auteur
Magpie Geese use a unique polygynous mating system, involving apparently stable trios of one male and two females. Plumage shows little sexual differentiation, but there is considerable dimorphism in body size, with males being about 30% heavier[...]
Article
Hugh Boyd, Auteur
The value of the comparative method in ethology was established at the intra- and inter-generic level about 60 years ago. Here I suggest that intraspecific comparisons of behaviour at long intervals may also be instructive (though in less dramat[...]
Article
H. Boyd, Auteur ;
A. D. Fox, Auteur ;
J. N. Kristiansen, Auteur ;
D. A. Stroud, Auteur ;
A. J. Walsh, Auteur ;
S. M. Warren, Auteur
Abdominal profiles of spring-staging White-fronted Geese in Iceland were recorded in 1990, 1991, 1997 and 1998, chiefly at Hvanneyri, the largest known staging area. Median profile scores were markedly lower on arrival in Iceland than at departu[...]
Article
Anthony D. Fox, Auteur ;
Johnny Kahlert, Auteur ;
Alyn J. Walsh, Auteur ;
David A. Stroud, Auteur ;
Carl Mitchell, Auteur ;
Jens N. Kristiansen, Auteur ;
Ebbe Bogebjerg Hansen, Auteur
We used measurement of wing feather length as an index of moult stage to assess body mass changes amongst samples of geese caught from three different wild populations during the period of regrowth of flight feathers. Amongst male and female Gre[...]
Article
Elizabeth H. Rave, Auteur ;
Robert C. Fleischer, Auteur ;
Fern Duvall, Auteur ;
Jeffrey M. Black, Auteur
We determined the effects of inbreeding, husbandry, age, and pair bond tenure on reproductive success in captive populations of endangered Hawaiian Geese, or Nene Branta sandvicensis. We found evidence of inbreeding depressions among captive Nen[...]
Article
S. M. Slattery, Auteur ;
G. Samelius, Auteur ;
R. I. Alisauskas, Auteur ;
J. R. Danielson, Auteur ;
F. P. Moore, Auteur
Breeding and non-breeding ducks commonly respond to terrestrial predators or novel moving objects by approaching or following such stimuli (Hochbaum 1955). This behaviour, called 'tolling' (Hochbaum 1955), has been exploited to capture ducks for[...]
Article
Mary A. Bishop, Auteur ;
Canjue Zhouma, Auteur ;
Song Yanling, Auteur ;
Jim Harkness, Auteur ;
Gu Binyuan, Auteur
Approximately 66% (3,900) of the world's Black-necked Crane population winter in south-central Tibet, People's Republic of China. We collected information on winter habitat use by cranes concurrent with population surveys conducted during four w[...]
Article
R. W. Summers, Auteur ;
R. A. Mavor, Auteur
Bottle Sedge Carex rostrata provided the main nesting habitat of Slavonian Grebes in Scotland. In the sedge beds, the sedge density decreased and water depth increased from land to open water. The grebes preferred to nest in dense sedges growing[...]
Article
Scott A. Petrie, Auteur
The intensity and chronology of moult in breeding and post-breeding White-faced Whistling-Ducks Dendrocygna viduata were studied during 1992/1993 and 1995 in a semi-arid region of Northern Province, South Africa. Adult males and females were mou[...]
Article
Stuart E. Newson, Auteur ;
Baz Hughes, Auteur
Diurnal activity of wintering Goosander was studied at Chew Valley Lake using instantaneous scan sampling. The sex ratio of 0.48 males per female was relatively consistent through midwinter 1995/1996. Daily energy expenditure calculations, based[...]
Article
Cyndi Smith, Auteur ;
Fred Cooke, Auteur ;
R. Ian Goudie, Auteur
Most ducks (Subfamily Anatinae) progress through a sequence of moults from natal downy plumage to definitive alternate plumage. The accurate identification of age classes by plumage allows the proportion of immature males to adult males in the a[...]
Article
Johnny Kahlert, Auteur ;
Malcolm Coupe, Auteur ;
Fred Cooke, Auteur
During the late winter and spring of 1997, sex-ratios and pairing chronology of Red-breasted Mergansers were studied in the Fraser River Estuary, south west Canada. Until late March at one site, English Bay, there was a strong male-bias, whereas[...]
