Würgfalke

Bestimmung

The saker falcon is a large hierofalcon, larger than the lanner falcon and almost as large as gyrfalcon at 45–57 cm (18–22 in) length with a wingspan of 97–126 cm (38–50 in). Males weigh between 730–990 g (26–35 oz) and females 970–1,300 g (34–46 oz). It resembles a larger but browner Prairie Falcon. It is larger and more heavily built than the related Lanner Falcon.<p>Saker falcons tend to have variable plumage. Males and females are similar, except in size, as are young birds, although these tend to be darker and more heavily streaked. The call is a sharp kiy-ee or a repeated kyak-kyak-kyak.

Taxonomie

This species belongs to the close-knit hierofalcon complex. In this group, there is ample evidence for rampant hybridization and incomplete lineage sorting which confounds analyses of DNA sequence data to a massive extent; molecular studies with small sample sizes can simply not be expected to yield reliable conclusions in the entire hierofalcon group. The radiation of the entire living diversity of hierofalcons seems to have taken place in the Eemian interglacial at the start of the Late Pleistocene, a mere 130,000–115,000 years ago; the saker falcon represents a lineage that expanded out of northeastern Africa into the interior of southeastern Europe and Asia, by way of the eastern Mediterranean region.<p>The Saker Falcon has four officially recognized subspecies in the international ornithology according to IOC World Bird List:<p>Some saker falcons at the northeast edge of the range in the Altai Mountains are slightly larger, and darker and more heavily spotted on the underparts. These, known as the Altai falcon, have been treated in the past either as a distinct species "Falco altaicus" or as a hybrid between saker falcon and gyrfalcon. However, modern opinion (e.g. (Orta 1994)) treats them as a form of saker falcons and new research in population genetics and ecology supports that view. According to a recent study, Altai falcons are genetically intermingled with the broader Asian Saker population and do not constitute a distinct cluster, indicating that they are only colour morphs, and do not represent a separate taxonomic entity.<p>In captivity, lanners and sakers can interbreed, and gyrfalcon-saker hybrids are also available (see bird flu experiment described in "Ecology and status").The specific name, cherrug, comes from the Sindhi name charg for a female saker. The common name saker comes from the (Arabic: صقر, romanized: Ṣaqr) meaning "falcon".

Wissenschaftlicher Name

Falco cherrug

Autorität

Gray, JE, 1834

Ordnung

Falconiformes

Familie

Falconidae

Gattung

Falco

Verbreitung und Lebensraum

Brutgebiet

PAL : plains and mountains of c Europe to c Asia, s Siberia, n China, Himalayas and Tibet

Überwinterungsgebiet

s Europe, n, e AF, Iran e to Nepal, n India, and s, c China

Zugverhalten

Complete migrants

Verhalten

The saker falcon is a raptor of open grasslands preferably with some trees or cliffs. It often hunts by horizontal pursuit, rather than the peregrine's stoop from a height, and feeds mainly on rodents and birds. In Europe, ground squirrels and feral pigeons are the most common prey items. This species usually builds no nest of own, but lays its 3–6 eggs in an old stick nest in a tree which was previously used by other birds such as storks, ravens or buzzards. It also often nests on cliffs.<p>Saker nests support a species-rich assemblage of commensal insects.

Schutzstatus

BirdLife International categorises this bird as endangered, due to a rapid population decline, particularly on the central Asian breeding grounds. Ever since the collapse of the Soviet Union, the United Arab Emirates have been the main destination for thousands of falcons caught and sold illegally for hefty sums at the black market. Kazakhstan is estimated to lose up to 1,000 saker falcons per year.<p>The species also faces pressure from habitat loss and destruction. The population was estimated to be between 7,200 and 8,800 mature individuals in 2004. However, sakers live at low densities across large ranges in remote regions, making distribution status difficult to assess. A climatic niche modelling study pinpointed certain remote areas for targeted population surveys. In the United States, Canada and Europe there are several captive breeding projects. The most dramatic decline of the saker falcon in Asia has been in Kazakhstan and Uzbekistan. In contrast, a strongly protected and relatively abundant population persists in Hungary.<p>Saker falcons are known to be very susceptible to avian influenza, individuals having been found infected with highly pathogenic H5N1 (in Saudi Arabia) and H7N7 (in Italy) strains. Therefore, an experiment was done with hybrid gyr-saker falcons, which found that five falcons vaccinated with a commercial H5N2 influenza vaccine survived infection with a highly pathogenic H5N1 strain, whereas five unvaccinated falcons died. This means that sakers could be protected from bird flu by vaccination, at least in captivity.

Bestandstrend

declining