White Stork (Ciconia ciconia) Science Article 8 abstract More than 200 flight paths of White Storks were recorded during spring and autumn 1991/92 at two sites in southern Israel by tracking radar. White Storks did not adapt flight behaviour to maximize cross-country speed as predicted by theory. Gliding airspeed was not adjusted to climb rate […]
Time budget, habitat use and breeding success of White Storks Ciconia ciconia under variable foraging conditions during the breeding season in Switzerland.
White Stork (Ciconia ciconia) Science Article 9 abstract Following its extinction in 1950, the White Stork Ciconia ciconia was reintroduced to Switzerland. We analysed time budget, habitat use and breeding success of 28 breeding pairs at five sites in 1994. At two sites the adults were given extra food daily (SF), at the others no […]
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 […]
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 […]
Conservation measures based on migration research in whitestorks (Ciconia ciconia, Ciconia boyciana)
White Stork (Ciconia ciconia) Science Article 6 abstract For over a decade, we have been using satellite tracking to study the migration of white storks (Ciconia ciconia) alongtheir eastern migration route from Europe to southern Africa. About 120 individuals have been monitored by satellite-trackingto determine the route of the journey, choice of staging areas and […]
NOTES ON THE BEHAVIOR OF THE WHITE BELLBIRD
White Bellbird (Procnias albus) Science Article 1 abstract Little has been recorded of the White Bellbird (Procnias alba) in the field. In March 1960 I made brief observationso n a singlea dult male in the Kanaku Mountains of southern Guyana, but my description of the displays was very incomplete (B. K. Snow 1961, Auk 78: […]
Speed of spring migration of Tundra Swans Cygnus columbianus in accordance with income or capital breeding strategy?
Whistling Swan (Cygnus columbianus) Science Article 2 abstract Large migratory birds may bring along stores in order to survive adverse conditions and produce a clutch upon arrival (
The condition of Bewick’s Swans Cygnus columbianus bewickii in winter as assessed by their abdominal profiles.
Whistling Swan (Cygnus columbianus) Science Article 1 abstract An Abdominal Profile (AP) scale was developed to assess body condition of Bewick’s Swans in the field. Change in AP score for individual birds correlated significantly with change in their body mass; moreover AP was significantly correlated with condition indices that were designed to remove the potential […]
The influence of social interactions on the foraging path of Bewick’s Swans Cygnus columbianus bewickii.
Whistling Swan (Cygnus columbianus) Science Article 3 abstract The efficiency in which high-density food patches are found is determined by the way foragers move between patches. In this study we explore the effect of social interactions on the foraging path, in particular the distance moved between patches. We studied Bewick’s Swans Cygnus columbianus bewickii that […]
Reproductive parameters in relation to food supply in the whiskered tern ( Chlidonias hybrida )
Whiskered Tern (Chlidonias hybridus) Science Article 1 abstract It is generally accepted that breeding terns are sensitive to food supply and that their reproductive effort could be substantially affected by the availability and access to resources. In this study we examined reproductive parameters in the whiskered tern Chlidonias hybrida in relation to food supply during […]