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1.
Splošna in anorganska kemija
Peter Glasnović, Elena Varljen Bužan, drugo učno gradivo

Najdeno v: osebi
Ključne besede: biodiverziteta, anorganska kemija
Objavljeno: 15.10.2013; Ogledov: 2656; Prenosov: 41
URL Polno besedilo (0,00 KB)

2.
Genetske raziskave živali
2011, radijski ali tv dogodek

Najdeno v: osebi
Objavljeno: 15.10.2013; Ogledov: 1767; Prenosov: 9
URL Polno besedilo (0,00 KB)

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Mitochondrial cytochrome b sequences resolve the taxonomy of field mice (Apodemus) in the western Balkan refugium
Boris Kryštufek, Martina Lužnik, Elena Varljen Bužan, 2012, izvirni znanstveni članek

Opis: Apodemus sylvaticus stankovici, described from the topographically rough landscape of the western Balkan glacial refugium, was recently proposed as being either a junior synonym of Apodemus flavicollis or a species on its own right. To untangle this taxonomic vagueness, we sequenced complete cytochrome b gene in 28 field mice collected at 12 locations in the mountains of Bosnia and Herzegovina, Montenegro, western Macedonia and northern Greece. Samples yielded 27 new haplotypes which clustered into two distinct groups. One of these clades also included the reference haplotype of A. flavicollis, while another cluster emerged as being identical with the reference sample for A. sylvaticus. As is common in Apodemus, both species retrieved in our analysis were characterized by low levels of intraspecific variation (0.4- 0.9%) as opposed to a high level of differentiation between them (8.0-10.0%); therefore, the taxonomic classification of our material was without doubt. We found no evidence regarding the presence of an additional cryptic species in the mountains of the western Balkans. The very similar values of genetic variability in the two species imply their common evolutionary history of a long-term coexistence in the western Balkan refugium
Najdeno v: osebi
Ključne besede: Mice, Apodemus flavicollis, Apodemus sylvaticus, Apodemus stankovici, molecular taxonomy
Objavljeno: 15.10.2013; Ogledov: 1639; Prenosov: 7
URL Polno besedilo (0,00 KB)

5.
Population genetics of chamois in the contact zone between the Alps and the Dinaric Mountains
Elena Varljen 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: 1512; Prenosov: 13
URL Polno besedilo (0,00 KB)

6.
Evolutionary history of mole rats (genus Nannospalax) inferred from mitochondrial cytochrome b sequence
Boris Kryštufek, Elena Ivanitskaya, Atilla Arslan, Emine Arslan, Elena Varljen Bužan, 2012, izvirni znanstveni članek

Opis: Mole rats (genus Nannospalax) display prolific chromosomal variation with more than 50 distinct cytotypes. These cytotypes are largely indistinguishable morphologically, are mainly allopatric and their taxonomic ranking is contradictory. We established a cytochrome b phylogeny for 15 cytotypes belonging to all three species recognized on morphological grounds (morphospecies): N. leucodon, N. xanthodon and N. ehrenbergi. Phylogenetic reconstructions yielded two highly divergent groups which are in agreement with the current division into two subgenera (Nannospalax and Mesospalax). The former comprised samples from south-eastern Turkey, Israel and Egypt (the morphospecies N. ehrenbergi). Basal dichotomy within Mesospalax remained unresolved and the putative sister position of N. leucodon against the two lineages of N. xanthodon was not supported in our analysis. Net divergences between sister cytotypes were low (< 2.0%) and two N. leucodon cytotypes were not even reciprocally monophyletic. Among the three morphospecies, the genetic diversity was lowest in N. leucodon (2.4% 0.3%), highest in N. xanthodon (8.8% 0.7%) and intermediate in N. ehrenbergi (5.0% 0.5%). Our results show that associations between genetic and chromosomal variation are not widespread and common in mole rats, and therefore refute the generalization of a 'cytotype-equals-species' approach
Najdeno v: osebi
Ključne besede: molecular phylogeny, Nannospalax ehrenbergi, Nannospalax leucodon, Nannospalax xanthodon, Spalax, species delimitation
Objavljeno: 15.10.2013; Ogledov: 1279; Prenosov: 7
URL Polno besedilo (0,00 KB)

7.
New insights into the taxonomy and phylogeny of social voles inferred from mitochondrial cytochrome b sequences
Boris Kryštufek, Tanya Zorenko, Elena Varljen Bužan, 2012, izvirni znanstveni članek

Opis: We sequenced the entire cytochrome b gene in Microtus paradoxus from Turkmenistan and Microtus socialis from Crimea and Kalmykia. Phylogenetic relationships among social voles were reconstructed by the inclusion into analyses of a further 23 published haplotypes belonging to six species. The two probabilistic methods which were used in phylogenetic analyses, the Bayesian inference and Maximum Likelihood, yielded very similar results. Both trees showed two highly divergent lineages which were further subdivided into seven species. The socialis lineage encompassed four species (M. socialis, M. irani, M. anatolicus, and M. paradoxus), and the remaining three species clustered into the guentheri lineage (M. guentheri, M. hartingi, M. dogramacii). The ranges for nucleotide divergences between seven species of social voles (4.95-9.28% and 4.18-8.81% for mean and net divergences, respectively) mainly exceeded 4.3%, which is frequently regarded as the conservative cut-off between sibling species in the specious genus Microtus
Najdeno v: osebi
Ključne besede: Microtus socialis, Microtus paradoxus, Arvicolinae, Cryptic species, Species delimitation, Molecular systematics
Objavljeno: 15.10.2013; Ogledov: 1156; Prenosov: 8
URL Polno besedilo (0,00 KB)

8.
Phylogenetic position of the Ohiya rat (Srilankamys ohiensis) based on mitochondrial and nuclear gene sequence analysis
Elena Varljen Bužan, Marie Pagès, Johan Michaux, Boris Kryštufek, 2011, izvirni znanstveni članek

Opis: We investigated the phylogenetic position the Ohiya rat, endemic to Sri Lanka, Srilankamys (Rodentia, Murinae), within the tribe Rattini based on the combined analysis of three independent genes (a mitochondrial one and two nuclear exons). Three major lineages (the Maxomys, the Dacnomys and the Rattus divisions) were retrieved as monophyletic groups within the tribe Rattini. Srilankamys was not affiliated to any of the representatives of the Dacnomys division as it was supposed based on morphological characters, but clearly appeared as the first genus to diverge among the Rattus division. The Mindanao Shrew Mouse, Crunomys melanius, emerged as a part of the Maxomys division raising questions about the validity of the Crunomys and the Maxomys divisions as currently defined. Molecular date of divergence between Srilankamys and the other representatives of the Rattus division falls within the interval 6.7 +- 0.74 Mya, coinciding with the time of the isolation of Sri Lanka from the Deccan peninsula and the aridification period owing to the climate change at the end of the Miocene epoch. We suggest that the isolation of Sri Lanka from the continent, reinforced by the action of a seasonal monsoon-dominated climate, would have led to the isolation of some ancestral rodents of the Rattus division, which would have differentiated later into the Ohiya rat by a vicariant process. In a more general point of view, our study supports the previous results obtained on other organisms and evidence that Sri Lanka appears to be characterized by a particular fauna as compared to the Indian mainland. This island would therefore be considered as a specific distinct hotspot of biodiversity
Najdeno v: osebi
Ključne besede: Ohiya rat, Srilankamys ohiensis, rodents, Phylogenetic analyses
Objavljeno: 15.10.2013; Ogledov: 1274; Prenosov: 7
URL Polno besedilo (0,00 KB)

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Microsatellite markers confirm extensive population fragmentation of the endangered Balkan palaeoendemic Martino's vole (Dinaromys bogdanovi)
Elena Varljen 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: 1261; Prenosov: 6
URL Polno besedilo (0,00 KB)

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