ZARYS DYNAMIKI LICZEBNOŚCI SZPONIASTYCH ACCIPITRIFORMES I SOKOŁOWYCH FALCONIFORMES W OKRESIE POZALĘGOWYM W KRAJOBRAZIE ROLNICZYM POD SIEDLCAMI
Journal Title: KULON - Year 2016, Vol 21, Issue
Abstract
In the periods 4 November 2011 to 15 March 2012 and 14 August to 21 November 2012, 11 surveys of birds of prey Accipitriformes and Falconiformes were conducted in the Zbuczyn area (56.3 square km) near Siedlce (E. Poland). Only stationary birds (resting or foraging) are included, without those flying high on migration. In the postbreeding season 2011-2012, a total of 11 species of the two orders of birds of prey were noted, varying from one to seven species and from eight to 57 individuals per survey. In total 314 birds were recorded. The most abundant species was the Buzzard Buteo buteo (N=265), contributing to 84.4% of all birds of prey. Buzzards were most abundant in the period of early autumn migration, with a highest density of 12.0 ind./10 square km of open area (grassland and cropland) and a lowest density in the early winter and late winter periods (1.8 ind./10 square km in each). Over the whole winter period (15 December – 17 February), the mean density was 3.0 ind./10 square km. In the late autumn period (November) of the two seasons (2011 and 2012), numbers of Buzzards did not differ markedly, varying from 19 to 25 individuals. Numbers of other species were much lower: Marsh Harrier Circus aeruginosus (N=17), Kestrel Falco tinnunculus (N=10); Rough-legged Buzzard Buteo lagopus (N=6), and Montagu’s Harrier Circus pygargus (N=5). Numbers of the remaining species did not exceed 4 individuals over the study period. The assemblage of birds of prey near Siedlce had the same species composition and dominance structure (Re=79) as that near Hajnówka monitored as the same time (Pugacewicz 2012). But their numbers were higher near Hajnówka. In total, 432 birds were recorded (9.4 ind./10 square km/survey), as compared with 314 birds (6.3 ind./10 square km/survey) near Siedlce. The densities of buzzards near Siedlce were lower than near Hajnówka. This was likely due to a lower available food supply, the proportion of open habitats being similar in the two areas. The pattern of changes in numbers of buzzards was similar in the two areas.
Authors and Affiliations
Andrzej Dombrowski, Łukasz Trębicki
Keywords
Related Articles
- EP ID EP184381
- DOI -
- Views 77
- Downloads 0
DYNAMIKA JESIENNEJ WĘDRÓWKI PTAKÓW W KRAJOBRAZIE ROLNICZYM POD RADZYNIEM PODLASKIM (NIZINA POŁUDNIOWOPODLASKA)
In the period of 19 August-18 November 2013, we observed autumn migration of birds in the agricultural landscape of the South-Podlasian Lowland (E. Poland). Two methods, point survey and transect survey, were used to cou...
DROBNE SSAKI REZERWATU „DĘBINA I” NA WSCHODNIM MAZOWSZU NA PODSTAWIE SKŁADU POKARMU PUSZCZYKÓW STRIX ALUCO
In the years 2007-2016 the food composition of Tawny Owls Strix aluco was examined in „Dębina I” reserve in Masovian Voivodship (52.40°N, 21.38°E). In the analysed bone material 2,655 vertebrate prey items were found, am...
ZARYS DYNAMIKI LICZEBNOŚCI SZPONIASTYCH ACCIPITRIFORMES I SOKOŁOWYCH FALCONIFORMES W OKRESIE POZALĘGOWYM W KRAJOBRAZIE ROLNICZYM POD SIEDLCAMI
In the periods 4 November 2011 to 15 March 2012 and 14 August to 21 November 2012, 11 surveys of birds of prey Accipitriformes and Falconiformes were conducted in the Zbuczyn area (56.3 square km) near Siedlce (E. Poland...
MAGAZYNOWANIE POKARMU PRZEZ SROKOSZA LANIUS EXCUBITOR WE WSCHODNIEJ POLSCE
Summer larders of the Great Grey Shrike Lanius excubitor were examined in the South-Podlasian Lowland (52°12’N, 22°31’E) during the April-October periods of 2015 and 2016 In total, 39 prey were recorded of five classes a...
GNIAZDOWANIE BŁOTNIAKA ŁĄKOWEGO CIRCUS PYGARGUS W SĄSIEDZTWIE WIEJSKIEJ ZABUDOWY
In 2015, we noted two cases of the Montagu’s Harrier Cirrus pygargus nesting very close (20m and 23m) to farm buildings in the agricultural landscape of the Mazovian Lowland. In the locality Olszewo-Grzymki, a nest was f...