Harlequin Duck (Histrionicus histrionicus) Science Article 1 abstract The timing of pair formation varies within and among species of ducks. In this study we documented the chronology of pair formation in a population of wintering Harlequin Ducks (Histrionicus histrionicus) in southwestern British Columbia. Harlequin Ducks began forming pair bonds in October and over half of […]
Fledgling sex ratio variation in colonies of Gull-billed Tern Gelochelidon nilotica
Gull-billed Tern (Gelochelidon nilotica) Science Article 1 abstract Fisher (1930) predicted that natural selectionshould favour equal parental investmentin male and female offspring, and that populationsex ratios at the end of the period ofparental care should be inversely related to thecost of producing individuals of each sex if fitnessreturns from investment in sons and daughtersare similar. […]
The Distribution and Conservation Status of the Gull-billed Tern ( Gelochelidon nilotica ) in North America
Gull-billed Tern (Gelochelidon nilotica) Science Article 2 abstract The Gull-billed Tern (Gelochelidon nilotica) has until recently received little conservation and managementattention within North America despite a relatively low overall population size and significant declines inparts of the breeding range. This lack of attention may stem in part from the wide distribution of the species, encompassingparts […]
Site fidelity of Icelandic Greylag Geese between winters
Greylag Goose (Anser anser) Science Article 9 abstract Britain supports almost the entire Icelandic population of Greylag Geese Anser anser in winter and has a special responsibility for the conservation of these birds. To facilitate the successful management of this population, the aim of this analysis was to ascertain the degree of site fidelity on […]
Remote sensing as a technique to assess reedbed suitability for nesting Greylag Geese Anser anser.
Greylag Goose (Anser anser) Science Article 1 abstract We studied Greylag Goose Anser anser nest distribution in relation to reed stem density in the Tgmmerby Fjord reedbed, Denmark, using rial photography to locate nests . Digitised photographs were used to establish a relationship be tween spectral signature and reed stem density. This technique classified 71% […]
Wintering Greylag Geese Anser anser in North-Africa.
Greylag Goose (Anser anser) Science Article 3 abstract Goose counts at the three major wintering grounds of North Africa from 1981/82 to 1988/89 are presented and discussed. The origin of the Greylag Geese wintering there is documented by individually marked geese. These neck-banded geese also proved that movements occur between Tunisia and Algeria and supported […]
Exploitation of a new staging area in the Dutch Wadden Sea by Greylag Geese Anser anser: The importance of food-plant dynamics.
Greylag Goose (Anser anser) Science Article 8 abstract The colonisation by Greylag Geese Anser anser of a new autumn migration staging area was studied on the island of Schiermonnikoog, The Netherlands. Over 500 Greylag Geese first visited the island in 1991. During subsequent years, peak numbers rose to 700-900 birds. The geese most likely originated […]
Grauwe Ganzen in de Ooijpolder
Greylag Goose (Anser anser) Science Article 2 abstract Trekgedrag en overleving van Grauwe Ganzen Anser anser in de Ooijpolder Chris van Turnhout, Berend Voslamber, Frank Willems & Gerwin van Houwelingen, Limosa 76 (2003): 117-122 Download article download full text (pdf)
Food, feeding-behavior and nutritional ecology of wintering Greylag Geese Anser anser.
Greylag Goose (Anser anser) Science Article 4 abstract Just after arrival in early autumn, Greylag Geese Anser anser wintering in the Marismas of the Guadalquivir (SW Spain) concentrated on Scirpus litoralis areas, but moved to Scirpus maritimus areas as soon as these zones were flooded after autumn rains. In both Scirpus habitats the diet was […]
Nocturnal feeding in moulting Greylag Geese Anser anser- An anti-predator response?
Greylag Goose (Anser anser) Science Article 6 abstract The diurnal activity patterns of Greylag Geese were studied at a Danish moulting site. Before moulting, Greylag Geese foraged throughout the 24 hour period, but changed to nocturnal feeding behaviour exclusively and roosted on offshore islets during the day, as they became flightless. As the moult progressed, […]