White-headed Duck (Oxyura leucocephala) Science Article 2 abstract The White-headed Duck Oxyura leucocephala is listed as Endangered on the IUCN Red List of Threatened Animals.It is also listed on Annex I of the European Union Directive on the Conservation of Wild Birds (79/409/EEC) (BirdsDirective), on Appendix II of the Convention on the Conservation of European […]
Category: Eurasia
Do Common Whitethroats (Sylvia communis) discriminateagainst alien eggs?
Whitethroat (Sylvia communis) Science Article 2 abstract In a coevolutionary arms race between a brood parasite and its host, both species are expected to evolve adaptations and counteradaptations, such as egg mimicry and egg discrimination. The Common Whitethroat (Syh, ia communis) is a regular Common Cuckoo (Cuculus canorus) host in some parts of its breeding […]
Male whitethroats, Sylvia communis, advertisetheir future contribution to parental care
Whitethroat (Sylvia communis) Science Article 1 abstract In altricial species participation of males in parental care enhances reproductive success offemales. How does a female select amate who will allocate time and energy to parental effort?In the whitethroat Sylvia communis, a socially monogamous bird, parental performance ofmales might be predicted on the basis of elaborated song […]
ENERGY EXPENDITURE BY FREE-LIVING DIPPERS (CINCLUS CINCLUS) IN WINTER
White-throated Dipper (Cinclus cinclus) Science Article 3 abstract We measured daily energy expenditure (DEE) of free-living Dippers (Cinclus cinclus) during winter, using the doubly-labelled water (DLW) technique. DEE was estimated as 206 kJd-1 by this method, compared to 194 kJd-l using time-activity budgets combined with laboratory estimates of metabolic costs D. M. BRYANT et al, […]
Conservation of the globally threatened white-headed duck,Oxyura leucocephala, in the face of hybridization with the NorthAmerican ruddy duck, Oxyura jamaicensis: results of a control trial
White-headed Duck (Oxyura leucocephala) Science Article 1 abstract The North American ruddy duck, introduced into Europe in the 1960s, threatens the globally endangered whiteheadedduck with extinction through hybridization. A regional control trial, conducted in three areas of Britain, killed over 2,600birds and led to a significant regional reduction in ruddy duck numbers. Control using firearms […]
Multi-annual spatial and numeric dynamics of the white-headed duck Oxyura leucocephala in southern Europe: seasonality, density dependence and climatic variability
White-headed Duck (Oxyura leucocephala) Science Article 3 abstract A statistical model is developed for the globally threatened white-headed duck during its regional expansion throughout Spain from 1980 to 2000; the model estimates the relative intrinsic, climatic and stochastic effects on population fluctuations and spatial expansion on several time-scales. Facing the current lack of knowledge on […]
Sexual differences in physical condition in the White-backed Woodpecker Dendrocopos leucotos
White-backed Woodpecker (Dendrocopos leucotos) Science Article 1 abstract Body-mass and wing-length of adultWhite-backedWoodpeckers Dendrocopos leucotos were measured in 57 males and 55 females in Surnadal community in western Norway during November-June from 1985 to 2001. The mean physical condition (ratio bodymass : wing length) of reproducing females in coastal areas was better than of females […]
Variable inter-annual relationships between T-cell mediated immunity and individual traits in White Storks
White Stork (Ciconia ciconia) Science Article 4 abstract Aims: The PHA skin-testing technique has become a widespread way of studying the ecological and evolutionary implications of T-cell mediated immunity (CMI) in birds. Several breeding and individual traits have been found to be related to CMI. However, it is not known how consistent these relationships are […]
Variation of primary production during winter induces synchrony in survival rates in migratory white storks Ciconia ciconia
White Stork (Ciconia ciconia) Science Article 12 abstract The environmental conditions that migratory birds experience during their stay at different locations throughout the year can have significant impact on the variation of annual survival rates. Because migrants often crowd during non-breeding, environmental conditions can affect survival rates of individuals originating from different breeding populations, thus […]
Development of thermoregulatory ability during ontogeny in the White Stork Ciconia ciconia
White Stork (Ciconia ciconia) Science Article 1 abstract The development of thermoregulation abilities in White Stork Ciconia ciconia nestlings was examined. Our results showed that body mass, and not age, was the best predictor for thermoregulatory ability despite what was found in passerines. White Stork nestlings did not develop their thermoregulatory abilities abruptly since their […]