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Streszczenie Dane o występowaniu sów w Puszczy Augustowskiej są niepełne i częściowo oparte o przy-padkowe obserwacje. Realizowany w 2004 r. w całej Puszczy Augustowskiej oraz w 2009 r. w Nadleśnictwie Augustów program Bubobory pozwolił na wykrycie stanowisk 5 gatunków sów: puchacza Bubo bubo, puszczyka Strix aluco, sóweczki Glaucidium passerinum,...
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Citations
... Puszcza Augustowska leży w obszarze zwartego zasięgu sóweczki na północy kraju. Pierwsze potwierdzenie występowania tego gatunku z Puszczy Augustowskiej pochodzi z roku 2001 (Zawadzka et al. 2009), a w 2010 r. populację tę oceniono na 40−60 par (Zawadzka et al. 2011). ...
The Pygmy Owl is a species with boreal and mountain distribution, showing an increasing trend and range expansion in Poland. Diet composition of the Pygmy Owl was studied based on the contents of the caches located in four forest stands in 2014−2017. In total 91 prey items have been identified. Birds constituted 60.4% of all prey items and 53.0% of their biomass in summer, and 81.6% and 79.5%, respectively, in winter-spring period. Tits Paridae were the most numerous prey items (16.9% in summer, 26.3% in winter and spring), and the most common prey species was Great Tit Parus major – 9.3% and 15.8%, respectively. The Eurasian Siskin Spinus spinus and Goldcrest Regulus regulus were caught in large numbers. Among mammals the Common Shrew Sorex araneus and the Bank Vole Myodes glareolus were the most common prey items. Prey mass ranged from 5 to 50 g, while the mean ± SD was 18 ± 7.9 g. The Song Thrush Turdus philomeols, weighting 50 g, was the biggest prey. The mean ± SD bird prey mass was 16 ± 6.9 g, while the mammalian prey 21 ± 9.3 g. Food composition indicates that the Pygmy Owl hunted both in the canopy and on the ground. The share of birds and mammals in the diet of the Pygmy Owl was variable, depending mainly on the seasonal availability of the prey and local habitat conditions.
... Puszcza Augustowska leży w obszarze zwartego zasięgu sóweczki na północy kraju. Pierwsze potwierdzenie występowania tego gatunku w Puszczy Augustowskiej pochodzi z roku 2001 (Zawadzka et al. 2009), a w 2010 r. populację tę oceniono na 40−60 par (Zawadzka et al. 2011). ...
Diet composition of the Pygmy Owl Glaucidium passerinum in the Augustów Forest (NE Poland). The Pygmy Owl is a species with boreal and mountain distribution, showing an increasing trend and range expansion in Poland. Diet composition of the Pygmy Owl was studied based on the contents of the caches located in four forest stands in 2014−2017. In total 91 prey items have been identified. Birds constituted 60.4% of all prey items and 53.0% of their biomass in summer, and 81.6% and 79.5%, respectively, in winter-spring period. Tits Paridae were the most numerous prey items (16.9% in summer, 26.3% in winter and spring), and the most common prey species was Great Tit Parus major – 9.3% and 15.8%, respectively. The Eurasian Siskin Spinus spinus and Goldcrest Regulus regulus were caught in large numbers. Among mammals the Common Shrew Sorex araneus and the Bank Vole Myodes glareolus were the most common prey items. Prey mass ranged from 5 to 50 g, while the mean ± SD was 18 ± 7.9 g. The Song Thrush Turdus philomeols, weighting 50 g, was the biggest prey. The mean ± SD bird prey mass was 16 ± 6.9 g, while the mammalian prey 21 ± 9.3 g. Food composition indicates that the Pygmy Owl hunted both in the canopy and on the ground. The share of birds and mammals in the diet of the Pygmy Owl was variable, depending mainly on the seasonal availability of the prey and local habitat conditions.
Ponds occurring frequently in agriculture areas are valuable enclaves of important and rare species of flora and fauna. The tested object is located in the agricultural catchment, where the ecological cultivation of wheat was carried out. The paper focuses on biogenic components such as N-NO3-, N-NO2-, N-NH4+, P-PO43. The good quality of pond surface water was found only in March (0.245 mg – P-PO43- · dm-3), while in the remaining months the water of this reservoir was characterized by unsatisfactory or poor condition of surface water quality. Taking into account the average concentration of P-PO43- (0.836 mg · dm-3) in the pond waters the investigated pond could be classified to the IV class of surface water quality. The tested surface water in respect of concentration of N-NH4+,was classified between the first (0.032 mg N-NH4+· dm-3) to second (0.842 mg N- NH4+·dm-3) class of surface quality. The concentrations of nitrate ions in pond water from March to October allowed to classify it to the first class of surface water quality (0.421-1.889 mg N-NO3- · dm-3). Also, in respect of N-NO2- concentration the examined water was at the first class of surface water quality during the whole study period (from March to October 2014 year). The form of farming (extensive or intensive) can affect the concentration of nutrients in surface midfield pond water. Lower concentrations of N-NO3- and N-NO2- may be associated with a lack of fertilization in areas adjacent to the pond. In contrast, elevated levels of P-PO43- can indicate on the accumulation capacity of this compound in aquatic sediments and the release of this compound in favorable conditions.
