Tag: all of Falco

Correlates of hunting range size in breeding merlins

Merlin (Falco columbarius) Science Article 1 abstract I studied variables affecting size of hunting range in breeding Merlins (Falco columbarius) from May to July, 1987-l 990 in Saskatoon, Canada. Males were monitored during most of the breeding season, whereas females were observed only in the fledging period when they hunt. During the incubation period, the […]

SEX DETERMINATION OF LESSER KESTREL (Falco naumanni ) BY PCRRFLP FROM FEATHER SAMPLES

Lesser Kestrel (Falco naumanni) Science Article 1 abstract The Lesser Kestrel (Falco naumanni) is a small colonial migratory falcon, mostly insectivorous (grasshoppers and locusts), that breeds in South Italy between March and September. Populations have decreased by 90% since the middle of the 20th century in Europe Costantini V., Guaricci et al, S.I.R.A., 2007 Download […]

International Action Plan for the Lanner Falcon Falco biarmicus

Lanner Falcon (Falco biarmicus) Science Article 2 abstract The Lanner Falcon is classified as Endangered at the European level and is categorised as SPEC 3(Tucker & Heath 1994). It is also listed in Annex I of the European Union’s Wild Birds Directive,Appendix II of the Bonn Convention, Annex II of the Bern Convention, and Appendix […]

Variation in the quality of parental care at falcon nests in South Africa as evidence for postulated differences in food availabi lity.

Lanner Falcon (Falco biarmicus) Science Article 1 abstract Parental care by Peregrine Falcons Falco peregrinus an d Lanner Falcons F. biarmicus during the nestling period was studied in two areas of South Africa. Comparisons were made between the quality of care administered to broods of Peregrine Falcons at nests in tropical (the Soutpansberg) an d […]

Behaviour of female Eurasian Kestrels during laying: are there time constraints on incubation?

Kestrel (Falco tinnunculus) Science Article 1 abstract To investigate time, energy, and temperature constraints on hatching asynchrony in Eurasian Kestrels (Falco tinnunculus), we observed females during the laying period and quantified the time spent hunting to see whether this might limir time spent incubating. We predicted that females would hunt more in years when the […]

Breeding biology and nest characteristics of the Eurasian Kestrel in different environments on an Atlantic island

Kestrel (Falco tinnunculus) Science Article 9 abstract We studied reproductive parameters, nest-site characteristics and breeding success of theEurasian Kestrel (Falco tinnunculus canariensis) on Tenerife Island, Canary Archipelago.Kestrels typically breed in cliffs cavities (79.4%), and were present in all habitatsfrom sea level to 2,400 m, except in shrubby heaths (rich in Myrica faya and Ericaarborea) and […]

Sex and testosterone effects on growth, immunity and melanin coloration of nestling Eurasian kestrels

Kestrel (Falco tinnunculus) Science Article 10 abstract Sex differences in testosterone levels and sex-biased sensitivity to testosterone are the basis of some ideas postulated to account for sex-linked environmental vulnerability during early life. However, sex variation in circulating testosterone levels has been scarcely explored and never manipulated at post-natal stages of birds in the wild. […]

Inter-sexual differences in the immune response of Eurasian kestrel nestlings under food shortage

Kestrel (Falco tinnunculus) Science Article 2 abstract When resources are limited, parents should decide the optimal number, size, and sex of progeny, and offspring should decide the optimal allocation of resources to different costly functions, such as growth and immunity. We manipulated clutch sizes of Eurasian kestrels by one egg to estimate possible cumulative effects […]

Influence of hatching order on growth rate and resting metabolism of kestrel nestlings

Kestrel (Falco tinnunculus) Science Article 3 abstract Hatching asynchrony in altricial birds may result in a competitive disadvantage for the youngest nestlings compared to older siblings. We studied the effects of a size hierarchy on the growth rate of Eurasian kestrels Falco tinnunculus chicks in nests with and without access to supplemented food in western […]