Wyniki wyszukiwania - Biblioteka Nauki

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Pierwsze wyniki pozycjonowania GPS trzmielojadów Pernis apivorus gniazdujących na Podlasiu i wnioski z nich płynące dla monitoringu i inwentaryzacji gatunku

100%

Mirski P. , Tumiel T.

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nr 1

EN

The Honey Buzzard is known as a species difficult to monitor and count. Here we report results of a pilot GPS-tracking study aiming to reveal details of its ecology, that could help in optimization of the species monitoring methods. Five breeding adult Honey Buzzards males were caught and equipped with GPS loggers in Podlasie region, NE Poland: three in the Białowieża Primaeval Forest, one at the Sokółka Hills and one in the city of Białystok. In a mosaic landscape nests were located even in tiny (e.g. as small as 1.2 ha) and young (23-years old) stands. Studied individuals showed home ranges of 11–36 km2 (95% utilization distribution). Most males foraged only up to 3 km from their nests, while one individual up to 5.5 km. The overlap in home ranges of neighboring males reached up to 48%. Breeding territories were left between 8 August and 1 September, depending on nesting success and chick development stage. This study indicates that the monitoring of the Honey Buzzard should be carried out in deciduous forests of all ages and sizes. Monitoring in the second half of September should be done with caution, due to the possible presence of transient individuals, wandering around after nesting failures or during early migration. While mapping territories observers have to bear in mind possible strong overlap of home ranges and their asymmetric shape.

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Wykorzystanie telemetrii GPS w badaniach ekologii przestrzennej orlika krzykliwego w Dolinie Biebrzy

100%

Mirski P. , Maciorowski G.

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nr 3[36]

3

Central-place foraging in an urban landscape: body mass of common voles (Microtus arvalis Pall.) caught by breeding Kestrels (Falco tinnunculus L.) is positively correlated with availability of hunting sites

80%

Kubacka J. , Zmihorski M. , Mirski P. , Rejt L.

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nr 2

EN

In the reproduction period a male Kestrel (Falco tinnunculus) is a centralplace forager, i.e. it transports food from hunting grounds to a central location – the nest. A centralplace forager is predicted to take larger or more prey when distance to a foraging site is longer. We studied kestrels breeding in a large Central European city (population 1.7 million), whose main prey are common voles (Microtus arvalis). Kestrel nests are located in the centre and the outskirts, although common voles are scarce in the former. The aim of our study was to analyse the body mass of common voles found in pellets under kestrel nests and relate it to the availability of common vole habitats within 1 km from the nests, controlled for vole frequency in the pellets. We assumed that the greater availability of common vole habitats, the shorter the distance to a foraging site. We found that the body mass of common voles found in pellets was significantly positively correlated with the availability of their habitats, but was not affected by their frequency in pellets. Our results may indicate that, contrary to the central-place foraging rule, and irrespectively of the amount of other prey taken, the kestrels hunted smaller voles when foraging grounds were further away. This might stem from decreased selectivity caused by competition, either in the native territory (due to the high density of kestrels in the centre) or in territories of outskirt kestrels, invaded by city centre kestrels. On the other hand, due to lack of data on the body size of common voles in our study area, the results may suggest that common voles were on average smaller in the centre than in the outskirts. Although the published data do not support the second explanation, more research is needed to verify this.

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Hybridisation dynamics between the Greater Spotted Eagles Aquila clanga and Lesser Spotted Eagles Aquila pomarina in the Biebrza River Valley (NE Poland)

80%

Maciorowski G. , Mirski P. , Vali U.

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nr 1

5

Identification of the barrier to gene flow between phylogeographic lineages of the common hamster Cricetus cricetus

71%

Banaszek A. , Ziomek J. , Jadwiszczak K. A. , Kaczynska E. , Mirski P.

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nr 3

EN

In anthropogenically disturbed habitats, natural barriers still exist and have to be recognized, as they are important for conservation measures. Areas of phylogeographic breaks within a species are often stabilized in inhospitable regions which act as natural barriers. An area of contact between phylogeographic lineages of the common hamster (Cricetus cricetus) was found in the Małopolska Upland in Poland. A total of 142 common hamsters were captured between 2005 and 2009. All hamsters were genotyped at 17 microsatellite loci and partial sequences of the mitochondrial (mtDNA) control region were obtained. No mixed populations with mtDNA haplotypes of both lineages were found. The distance between marginal populations was about 20 km; no hamsters were found in the area between. A principal components analysis (PCA) was performed on microsatellite data and the greatest change in PC1 scores was found between marginal samples. To define the habitat components responsible for the phylogeographic break, we compared the habitat composition of sites occupied by hamsters with those from which hamsters were absent. We found that hamsters avoided forested areas and sandy soils. The area of the potential barrier was characterized by a high proportion of woodland and unfavorable soils in comparison with neighboring areas inhabited by hamsters. They cannot settle in this area due to their high winter mortality in shallow burrows and high predation in the fields adjacent to forests.

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Pokarm polnej populacji blotniaka lakowego Circus pygargus w okresie pisklecym na Nizinie Poludniowopodlaskiej i Mazowieckiej

71%

Mirski P. , Krupinski D. , Lewtak J. , Lewtak M. , Menderski S.

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nr 1

55-58

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Zimowanie podgatunków kawki Corvus monedula w wybranych miastach Polski

51%

Mirski P. , Polakowski M. , Budka M. , Krolak T. , Latkowski M. , Michalczuk J. , Nagorski P. , Rusiecki S.

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tom 52

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nr 2