НАУКА ЗА ГОРАТА, КН. 1-2, 2001
FOREST SCIENCE, No 1-2, 2001
НОВИ ДАННИ ЗА НЯКОИ СЛАБО ИЗУЧЕНИ ВИДОВЕ ГОРСКИ СОВИ (STRIX
URALENSIS, GLAUCIDIUM PASSERINUM, AEGOLIUS FUNEREUS) В БЪЛГАРИЯ
Б. Николов, П. Шурулинков, И. Николов, А. Рогев, А. Дуцов, Р. Станчев, И. Христов
NEW DATA ON SOME POORLY-STUDIED FOREST SPECIES
OF OWLS (STRIX URALENSIS, GLAUCIDIUM PASSERINUM, AEGOLIUS
FUNEREUS) IN BULGARIA.
1
Boris Nikolov, 2Ivan Hristov, 1Peter Shurulinkov, 1Ivailo Nikolov,
1
Asen Rogev, 1Alexander Dutsov, 1Radoslav Stanchev
1
Bulgarian Ornithological Centre, Institute of Zoology - Sofia
2
National Park Vitosha Administration, NFB - Sofia
(S u m m a r y)
Ural Owl (Strix uralensis), Pygmy Owl (Glaucidium passerinum) and Tengmalm‘s Owl
(Aegolius funereus) are among the poorly investigated species of birds in Bulgaria. Some of
the old-known localities of these owls in Central Stara planina are confirmed in the present
paper: in the reserves ‘Tsarichina’ (Ural and Tengmalm’s Owls) and ‘Steneto’ (Ural and
Pygmy Owls). Data on the Tengmalm’s Owl in ‘Steneto’ reserve are the earliest inthis part of
the mountain. Three new Tengmalm’s Owl localities are quoted for different ridges of the
Rhodopes, as well as more than other 25 - in Vitosha.
Ural and Pygmy Owls were recorded only during autumn and at almost same elevation (1400
- 1500 m). During nesting season Tengmalm’s Owl was established between 1530 m a.s.l.
(Vitosha) and 1850 m a.s.l. (the Rhodopes), and during autumn - between 1520 m a.s.l.
(Vitosha) and 1850 m a.s.l. (Stara planina). This species inhabits the coniferous belt in the
mountains and favours mainly spruce forests, but also different types of mixed forests. Some
data are presented also on the vocal activity of the Tengmalm’s Owl in several localities.
As a result of the detailed investigation on this species during 1999 on Vitosha, the breeding
population of the Tengmalm’s Owl is considered to be 30 - 50 pairs with in the frames of this
natural park. This is the first comparatively accurate estimation of the numbers of this species,
although for a limited region, in Bulgaria. Taking into account the total area and the
fragmentariness of all suitable habitats in five of the high Bulgarian mountains (where
localities of Tengmalm’s Owl are known till now), and the breeding density already
established in Vitosha as well, it can be assumed that the largest population of this species is
in the Rhodopes, followed by Rila, Stara planina, Pirin and Vitosha. Rough as it is, such
extrapolation shows breeding population of at least 700 - 1100 pairs of Tengmalm’s Owls in
Bulgaria.