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1

The effect of fishponds on the regional bird fauna

100%
Bochenski Z.
Acta Hydrobiologica
|
1995
|
tom 37
|
nr Suppl.1
2

Factors affecting road mortality of the Barn Swallows Hirundo rustica in farmland

84%
Orlowski G.
Acta Ornithologica
|
2005
|
tom 40
|
nr 2
117-125
Ninety-nine road-killed Barn Swallows were found during three years of studies on a 48.8 km road network in an intensively farmed landscape in SW Poland. Nearly 88% of all road-kills were recorded in built-up areas and on road sections in their vicinity. The average number of road-kills per 1 km of roads was over twenty times higher in built-up areas than in open agricultural landscape (6.74 vs 0.33 road-kills/1 km). This paper investigates the influence of environmental factors (lines of trees along roads, number of livestock, volume of traffic, number of inhabitants) on the level of Barn Swallow mortality on the roads in question. During the breeding season the number of birds killed in built-up areas was related positively to the number of cattle reared, the overall number of livestock (including pigs) and the number of inhabitants. In the multiple regression model following stepwise forward selection, the number of cattle explained 41% of the variance in the size of the whole-year road mortality of swallows in the built-up area. During the autumn migration period the length of tree-lined road sections in the built-up area had an significant influence on road-kill frequency, explaining 36% of the variance in mortality. Mortality was high on tree-lined sections of road in adverse weather conditions.
3

NABU's part in the international network of nature conservation

84%
Mayr C.
The Ring
|
1993
|
tom 15
|
nr 1-2
4

Avian responses to undergrowth removal in a suburban wood

67%
Orlowski G., Martini K., Martini M.
Polish Journal of Ecology
|
2008
|
tom 56
|
nr 3
487-495
The breeding (in 1991–1996) and wintering (1991/1992–1993/1994) avian community were surveyed in a suburban wood (29.27 ha) in Wrocław city (SW Poland). The 1992 breeding season began together with a drastic clearance of the compact undergrowth with the use of heavy machinery. A slump of abundance of the species nesting on the ground and small shrubs (≤1.5 m) followed, coupled with some modifications to their breeding behaviour, such as clustering of several singing males on the remaining bushes (Blackcap Sylvia atricapilla L.) and nesting in the piles of cut branches (Blackbird Turdus merula L.). As a result of the removal of 52% of the whole undergrowth the density of species nesting on the ground and small shrubs in 1992 was by 26% lower than in 1991 (decrease from 61.8 to 46.3 pairs 10 ha⁻¹). After 1993 a spontaneous regeneration of the bushy vegetation took place, with the ground and shrub-nesting species’ density recovering to 49.4 pairs 10 ha⁻¹ in 1996. After 1991 the park was colonized by 9 new hole-nester species, which was accompanied by the increase of density of this group (from 21.9 in 1991 to 37.9 pairs 10 ha⁻¹ in 1996). Throughout the entire study period a slight rise of density of birds nesting in tree canopies was visible (21.3 pairs 10 ha⁻¹ in 1991 and 33.8 pairs 10 ha⁻¹ in 1996). A year after the shrub clearance the wintering bird abundance was significantly lower (half of the previous numbers), with plant-eaters and insectivores hardest hit, especially Great Tit Parus major L. (average number of inidividuals per one count amounted to 59.2 in 1991/1992 and 21.9 in 1992/1993) and Blue Tit Parus caeruleus L. (respectively 37.0 and 16.0 ind.). An adequate timetable of vegetation clearance must be set up in the course of any decision-making process regarding green areas management to ensure the environmental issues are addressed properly
5

Illegal trade in birds of prey: A growing problem between eastern and western Europe

67%
Brucher H.
The Ring
|
1993
|
tom 15
|
nr 1-2
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