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Krzywe, Poland

Janiszewski P.,University of Warmia and Mazury | Hanzal V.,Czech University of Life Sciences | Misiukiewicz A.W.,Wigry National Park
Baltic Forestry

The Eurasian beaver (Castor fiber) is a keystone species that has a disproportionately large effect on ecosystem structure and function relative to its abundance and biomass. The variety of roles played by beavers in the ecosystem has been extensively discussed in the literature, and certain aspects of beaver activity have been explored in greater depth than others. The aim of this study was to summarize publications that analyze the impact of beaver habitats on changes in the quality and quantity of local fauna. © 2014 Lietuvos Misku Institutas. All rights reserved. Source

Wysocka A.,University of Gdansk | Krzysztofiak L.,Wigry National Park | Krzysztofiak A.,Wigry National Park | Zolnierkiewicz O.,University of Gdansk | And 2 more authors.
Insectes Sociaux

We present preliminary data on mitochondrial DNA diversity within and among populations of the ants Lasius niger and Lasius platythorax in Poland. Phylogenetic analysis based on the mitochondrial DNA markers: cytochrome c oxidase subunit I (cox1) and 16S ribosomal RNA (16S rRNA) confirms the species status of L. niger and L. platythorax. Intraspecific variability is low in both species, which might be a result of severe bottlenecks and rapid postglacial expansion into Central Europe. © 2010 The Author(s). Source

Krzysztofiak L.,Wigry National Park | Krzysztofiak A.,Wigry National Park | Frackiel K.,Biebrza National Park | Biala A.,University of Gdansk | And 2 more authors.
European Journal of Entomology

This is the first study of the morphological and molecular variation in two peripheral populations of the butterfly Jutta Arctic, Oeneis jutta, a glacial relict species endangered by the fragmentation of its habitat in Poland. An analysis of the morphological characteristics indicates that both Polish populations are similar but differ significantly in some characteristics. Levels of genetic variation were assessed using mitochondrial cytochrome oxidase subunit I (COI) and NADH dehydrogenase subunit 5 (ND5) gene fragments together with a segment of the mtDNA control region (CR) and a nuclear elongation factor-1α (EF-1α) gene sequence. In addition, the pattern of molecular variation in specimens from eastern and northern Europe was examined. Interestingly, the analysis of variation in a 932-bp sequence of the nuclear EF-1α gene in representatives of the populations studied revealed a relatively higher level of diversity than that of mitochondrial genes. There was evidence of divergence between the peripheral populations and lack of gene flow between them. The two closely situated populations had a high ΦST value (0.69), which clearly indicates their isolation. These populations appear to be demographically independent breeding units, with distinctive allele frequencies and consequently should be recognized as separate units for management and conservation. The preliminary results are in accord with an a priori subdivision based on collection areas and suggest that habitat fragmentation has affected the genetic diversity and structure of these populations. © 2003 Institute of Entomology. Source

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