Kestrel (Falco tinnunculus) Science Article 11 abstract Mate-guarding and frequent within-pair copulations are the two main paternityguards of male birds. Some species of birds of prey depend on large foraging areas due tothe availability and dispersion of their food, and males supply their females with food frommating until early chick rearing. Furthermore, birds of prey […]
Tag: all of Falco
Size-mediated dominance and begging behaviour in Eurasian kestrel broods
Kestrel (Falco tinnunculus) Science Article 4 abstract Resource allocation from parents to their offspring can be modulated by inter-sexual size dimorphism. High dimorphism promotes differential costs in rearing male and female offspring and unequal competitive ability among siblings. We examined whether any of these types of biases occur in Eurasian kestrels, Falco tinnunculus, in which […]
Year- and sex-dependent effects of experimental brood sex ratio manipulation on fledging condition of Eurasian kestrels
Kestrel (Falco tinnunculus) Science Article 5 abstract 1) Offspring sex ratio may be an unpredictable component of life history that might select for behavioural plasticity in parental care. If the parents do not have such plasticity and the two sexes of offspring differ in size, individuals in a brood or litter biased towards the larger […]
Between cohort variation in dispersal distance in the European Kestrel Falco tinnunculus as shown by ringing recoveries
Kestrel (Falco tinnunculus) Science Article 8 abstract Ringing recoveries of European Kestrels from north-western Europe have shown that a very low proportion of this population is migratory, and that even large-distance movements can be attributed mainly to dispersal movements of young birds. Several studies have shown the importance of food availability on dispersal rates in […]
First evidence of sex differences in the durationof avian embryonic period: consequences forsibling competition in sexually dimorphic birds
Kestrel (Falco tinnunculus) Science Article 7 abstract Parental favoritism in birds would be enhanced if parents can control any egg feature influencing the ontogeny of the embryo during incubation. Egg size and composition may influence the duration of incubation and hatching periods, and eggs bearing embryos of different sex may differ in size and composition. […]
Eurasian Hobby density, nest area occupancy, diet, and productivity in relation to intensive agriculture
Hobby (Falco subbuteo) Science Article 1 abstract A Eurasian Hobby (Falco subbuteo) population of 13-18 breeding pairs was studied for 6 years from 1987 to 1995 in a 62 km2 study area located within the seasonal flood zones of the PO River plain in northern Italy and characterized by intensive farmland interspersed with poplar (Populus […]
Woodpigeons nesting in association with hobby falcons:advantages and choice rules
Hobby (Falco subbuteo) Science Article 2 abstract Many bird species nest in close association with other bolder and more aggressive birds which provideprotection against nest predators. The woodpigeons, Columba palumbus, that nest in poplar plantations inNorthern Italy are found almost exclusively clumped around hobby, Falco subbuteo, nests. Woodpigeonssettle in the area and build their nests […]
Diving speeds and angles of a gyrfalcon (Falco rusticolus)
Gyrfalcon (Falco rusticolus) Science Article 1 abstract An optical tracking device recorded the threedimensional paths of 11 dives by a 1.02 kg gyrfalcon, trained to dive to a falconer. The dives started at altitudes up to 500 m above the ground and were inclined at angles of 17-62 deg from the horizontal. The falcon controlled […]
Southern Extension to the Breeding Range of the Gyrfalcon,Falco rusticolus, in Eastern North America
Gyrfalcon (Falco rusticolus) Science Article 2 abstract We report the observation of four gyrfalcon (Falco rusticolus) nests and several adults south of the previouslyrecognized southern limit of the species’ breeding distribution in eastern North America. Our southernmost observation extendsthe known breeding range approximately 400 km to the south. The northern forest tundra biome could delineate […]
Gyrfalcon predation on ptarmigan: numerical andfunctional responses
Gyrfalcon (Falco rusticolus) Science Article 3 abstract Gyrfalcon predation on ptarmigan during the breeding season was studied innorth-east Iceland 1981