19 Result(s)
within
Włodzimierz Jędrzejewski
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Article
Open AccessPrerequisites for coexistence: human pressure and refuge habitat availability shape continental-scale habitat use patterns of a large carnivore
Adjustments in habitat use by large carnivores can be a key factor facilitating their coexistence with people in shared landscapes. Landscape composition might be a key factor determining how large carnivores ...
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Jaguars (Panthera onca) in the Llanos of Colombia and Venezuela: Estimating Distribution and Population Size by Combining Different Modeling Approaches
The Llanos of Colombia and Venezuela are an ecoregion composed of savannas, forests, and wetlands, with a high biodiversity and once home to a high-density jaguar (Panthera onca) population. We used published and...
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Open AccessCollaborative behaviour and coalitions in male jaguars (Panthera onca)—evidence and comparison with other felids
Most large felids are classified as solitary species, with only lions (Panthera leo) and cheetahs (Acinonyx jubatus) exhibiting social, collaborative behaviours. Herein, we present evidence of the formation of ma...
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Open AccessEffect of sex, age, and reproductive status on daily activity levels and activity patterns in jaguars (Panthera onca)
All animals, including carnivores, adapt their daily activity duration and distribution to satisfy food demands, breed, or avoid mortality risk. We used the kernel density method to estimate daily movement act...
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Open AccessA meta-analysis of ungulate predation and prey selection by the brown bear Ursus arctos in Eurasia
At the biogeographic scale, spatial variation in diets may reflect not only the ecological flexibility of carnivore feeding habits, but also evolutionary adaptations of different populations within a species. ...
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Open AccessDensity and population structure of the jaguar (Panthera onca) in a protected area of Los Llanos, Venezuela, from 1 year of camera trap monitoring
Density is crucial for understanding large carnivore ecology and conservation, but estimating it has proven methodologically difficult. We conducted 1 year of camera trap** to estimate jaguar (Panthera onca) de...
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Open AccessConcordant mitochondrial and microsatellite DNA structuring between Polish lowland and Carpathian Mountain wolves
Phylogeographic studies of highly mobile large carnivores suggest that intra-specific genetic differentiation of modern species might be the consequence of the most recent Pleistocene glaciation. However, the ...
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Open AccessAnalyses of least cost paths for determining effects of habitat types on landscape permeability: wolves in Poland
Determining ecological corridors is crucial for conservation efforts in fragmented habitats. Commonly employed least cost path (LCP) analysis relies on the underlying cost matrix. By using Ecological Niche Fac...
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Habitat suitability, corridors and dispersal barriers for large carnivores in Poland
Carnivores are often particularly sensitive to landscape fragmentation. Ecological corridors may help to connect local populations, ensuring gene flow and retaining viable meta-populations. We aimed to establi...
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Open AccessPhylogeographic history of grey wolves in Europe
While it is generally accepted that patterns of intra-specific genetic differentiation are substantially affected by glacial history, population genetic processes occurring during Pleistocene glaciations are s...
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Spatial interactions between grey wolves and Eurasian lynx in Białowieża Primeval Forest, Poland
Various species of large predators are reported to influence each other through interference or exploitation competition that may affect demography and survival of the subordinate species. We analyzed spatial ...
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Reproductive behaviour of wild-living wolves in Białowieża Primeval Forest (Poland)
Characteristics of the reproductive behaviour of wolves (Canis lupus) were studied by radio-tracking and snow-tracking of four packs in Białowieża Primeval Forest (BPF), Poland, in 1995–1999. Signs of mating occu...
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Howling activity of free-ranging wolves (Canis lupus) in the Białowieża Primeval Forest and the Western Beskidy Mountains (Poland)
We investigated spontaneous howling by radio-collared wolves Canis lupus inhabiting the Białowieża Primeval Forest (BPF), eastern Poland, and elicited howling behavior in wolves of the BPF and the Western Beskidy...
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Factors affecting daily ranges of red deerCervus elaphus in Białowieża Primeval Forest, Poland
Daily ranges of 19 (6 males, 13 females) adult red deerCervus elaphus Linnaeus, 1758 were studied using 24-h tracking sessions in Białowieża Primeval Forest (BPF), Poland, from 2001 to 2004. Overall, size of mean...
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Habitat selection by wolvesCanis lupus in the uplands and mountains of southern Poland
Using data from the National Wolf Census, carried out in Poland in 2000–2001, and GIS techniques we analysed habitat selection by wolvesCanis lupus Linnaeus, 1758 in uplands and mountains of southern Poland. We c...
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Genetic diversity and relatedness within packs in an intensely hunted population of wolvesCanis lupus
A population of grey wolvesCanis lupus Linnaeus, 1758 inhabiting Białowieża Primeval Forest (BPF) on the Polish-Belarussian border has recovered after near extermination in the 1970s. Currently, it is intensively...
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The process of a wolf pack splitting in Białowieża Primeval Forest, Poland
In 1998, the pack of 7 wolvesCanis lupus Linnaeus, 1758, radio-tracked in Białowieża Primeval Forest, East Poland, split into 2 packs (2 and 5 wolves), when an 8-year-old alpha female ceased breeding. The two sis...
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Population dynamics ofClethrionomys glareolus andApodemus flavicollis: seasonal components of density dependence and density independence
Using long-term data on two forest rodent species [the bank voleClethrionomys glareolus (Schreber, 1780) and the yellow-necked mouseApodemus flavicollis (Melchior, 1834)] from the Białowieża Primeval Forest (E Po...
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Coulometric determination of sodium diethyldithiocarbamate and mercury with the use of the induced iodine-azide reaction
The characteristics of sodium diethyldithiocarbamate as the inductor of iodine-azide reaction carried out electrolytically have been presented. The influence of the pH and of the concentration of iodide ions o...
