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Burrow architecture, family composition and habitat characteristics of the largest social African mole-rat
Radim Šumbera, Vladimír Mazoch, Hana Patzenhauerová, Matěj Lövy, Jan Šklíba, Josef Bryja, Hynek Burda, 2012, izvirni znanstveni članek

Opis: African mole-rats, the giant mole-rat Fukomys mechowii is the largest social species. Despite several attempts to study a free-living population, information on its biology from natural habitats is very scarce. We mapped two neighbouring burrow systems of the giant mole-rat in a miombo woodland in Zambia. We provide information on the size and kin structure of the respective mole-rat families, architecture of their burrow systems, and characteristics of the food supply and soil around the two mapped and additional ten burrow systems. Both uncovered burrow systems were very large (total lengths, 2,245 and 743 m), making them the largest burrow systems ever mapped. Food resources around the additional ten burrow systems had a clumped distribution (standardized Morisita index of dispersion=0.526), but a relatively high biomass (298+-455 gm-2). This, together with favourable soil conditions even in the advanced dry season (cone resistance, 328+-50 Nm-2; soil density, 1.36+-0.06 gcm-3) indicates relatively hospitable ecological conditions. Both food supply and soil conditions were comparable with the conditions found in a miombo habitat of the solitary silvery mole-rat in Malawi. This suggests that there are no ecological constraints which would preclude the solitary life of a subterranean herbivore from the examined habitat. Microsatellite analysis supported the assumption that giant mole-rats live in monogamous multigenerational families with only one breeding pair of non-related animals and their offspring. The mean family size is consistent with previous findings on this species and comparable to that found in other Fukomys species studied thus far
Najdeno v: osebi
Ključne besede: Fukomys mechowii, giant mole-rat, subterranean rodent, burrow system, kin structure, Bathyergidae
Objavljeno: 15.10.2013; Ogledov: 1069; Prenosov: 14
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Population genetics of chamois in the contact zone between the Alps and the Dinaric Mountains
Elena Bužan, Josef Bryja, Barbora Zemanová, Boris Kryštufek, 2013, izvirni znanstveni članek

Opis: The chamois is a habitat specialist ungulate occupying continental archipelagos of fragmented rocky habitats which are frequently restricted to high altitudes. It is not clear whether forest habitats separating such population fragments act as barriers to gene flow. We studied the genetic makeup of the chamois in a topographically diverse landscape at the contact zone of two mountain ranges in Slovenia. Based on sequences of mitochondrial DNA, all Slovenian populations belong to a Northern chamois (Rupicapra r. rupicapra) subspecies. The range of chamois in Slovenia encompasses three different regions, each with unique topography, habitat connectivity and abundance of chamois: the Alps, the Dinaric Mts., and the Pohorje Mts. The habitat of the chamois is extensive and more or less continuous in the Alps, but suboptimal and fragmented in the remaining regions. In agreement with neutral genetic theory, large Northern chamois populations tended to have higher allelic richness and observed heterozygosity. Spatial clustering bears the differentiation into four geographically associated clusters within Slovenia and also revealed a strong substructure within all mountain ranges with suboptimal chamois habitat. Surprisingly, some small Dinaric populations have stayed genetically isolated in restricted habitat patches, even if they are geographically very close to each other. The four clusters, each having a unique demographic history, should be regarded as independent units for management purposes.
Najdeno v: osebi
Ključne besede: Rupicapra rupicapra, Chamois, population structure, microsatellites, fragmentation, conservation management
Objavljeno: 15.10.2013; Ogledov: 1937; Prenosov: 28
URL Polno besedilo (0,00 KB)

Traditional and diversified crops in South Moravia (Czech Republic)
Eva Jánová, Marta Heroldová, Adam Konečný, Josef Bryja, 2011, izvirni znanstveni članek

Najdeno v: osebi
Ključne besede: Microtus arvalis, Apodemus sylvaticus, agroecosystems, agricultural landscape, crop
Objavljeno: 15.10.2013; Ogledov: 1293; Prenosov: 26
URL Polno besedilo (0,00 KB)

Microsatellite markers confirm extensive population fragmentation of the endangered Balkan palaeoendemic Martino's vole (Dinaromys bogdanovi)
Elena Bužan, Boris Kryštufek, Josef Bryja, 2010, izvirni znanstveni članek

Opis: The Martino's vole is an endangered rodent endemic to the western Balkan Peninsula. Its range is fragmented, and populations are small due to high habitat specificity. The level of genetic variation within such populations is often low, and genetic differentiation between patchily dispersed populations is high. By scoring eight microsatellite loci in 110 individual Martino's voles originating from 27 locations throughout the species range, we analysed genetic variation at both the intra- and interpopulation level. Factorial correspondence analysis, Bayesian analyses, and allele sharing distances divided individuals into three phylogroups (Northwestern, Central, and Southeastern), thus providing independent support for phylogeographic structuring, a pattern that has been described in previous studies based on mitochondrial DNA. Spatial genetic analyses showed that populations are highly fragmented, even in those areas with the highest population densities. The highest intrapopulation genetic variability and stable effective population sizes were found in Mount Zelengora (Bosnia and Herzegovina), which harbours a relatively large population of Martino's voles. Populations in the Central and Southeastern lineages exhibited a significant isolation-by-distance pattern, indicating limited gene flow between them. Contrary to previous opinion, low effective population size and very limited gene flow between remaining populations suggest that the long-term existence of the Martino's vole might not be secure, even in populations that live in optimal habitats. The only threat to the Martino's vole identified thus far is competitive exclusion by the European snow vole. However, our results suggest that conservation problems associated with this paleoendemic rodent are more complex
Najdeno v: osebi
Ključne besede: Dinaromys bogdanovi, Martino's vole, population structure, conservation management, spatial genetics, metapopulation
Objavljeno: 15.10.2013; Ogledov: 1693; Prenosov: 45
URL Polno besedilo (0,00 KB)

Multiple pleistocene refugia and post-glacial colonization in the European chub (Squalius cephalus) revealed by combined use of nuclear and mitochondrial markers
Mária Seifertová, Josef Bryja, Martina Vyskočilová, Natália Martínková, Andrea Šimková, 2012, izvirni znanstveni članek

Opis: To analyse patterns of nuclear and mitochondrial genetic variation in the European chub, Squalius cephalus (Linnaeus, 1758), in order to understand the evolutionary history of this species and to test biogeographical hypotheses for the existence of co-distributed European freshwater fish species
Najdeno v: osebi
Ključne besede: freshwater fish, European chub, Squalius cephalus, glacial refugia, Cytochrome b, microsatellites, phylogeography, population structure, Europe
Objavljeno: 15.10.2013; Ogledov: 1424; Prenosov: 77
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