National Repository of Grey Literature 12 records found  1 - 10next  jump to record: Search took 0.01 seconds. 
Evolution of a dog domestication and genetic diversity of the recent breeds.
Ungrová, Lenka ; Černá Bolfíková, Barbora (advisor) ; Vinkler, Michal (referee)
The origin, timing and the developement of the first stages of domestication are the most frequently studied topics within the evolutionary domestication. Even there are a lot of studies, there are also a lot question that have not been answered. Consequent processes are not less interesting. It is known that the first prototypes of dog breeds were formed much earlier before the first breeding clubs were established. We can say, that the first selection was for the type of work which should be carried by the dog, besides the selection for tameness. The next step of selection included selection for the specific phenotypic traits and often involved targeted hybridization between emerging breeds. Over the past 200 years, more than 400 breeds with a unique combination of traits were recognized. This thesis aims to map the emergence of modern breeds from a genetic point of view. Thesis also summarizes the effect of evolution and domestication on specific traits and genes and how they affected the genetic diversity of dog breeds.
The role of hybridization in animal evolution
Šárová, Markéta ; Reifová, Radka (advisor) ; Černá Bolfíková, Barbora (referee)
There is a growing number of studies showing that interspecific hybridization and gene introgression have a creative role in the evolution of animals. These studies emphasize that hybridization and a gene introgression represent an important source of a genetic variability. Within the process of adaptive introgression, adaptive traits may spread among species and help them to colonize new environments. Interspecific hybridization may also contribute to the emergence of new phenotypes and evolutionary novelties and thus contribute to adaptive radiations. Hybridization can be also a cause of parallel evolutions in many organisms. Another way how hybridization affects evolution is related to a speciation. Hybrid speciation could be one of ways how new species arise, and in this way increase the biodiversity. However in many cases the hybridization has an opposite impact on species richness and present a danger of species extinction by hybridization. The aim of this bachelor thesis is to explain and discuss the above described processes, introduces selected examples of animals related to these processes, and finally evaluate the role of interspecies hybridization in animal evolution. Key words: interspecific hybridization, adaptive introgression, adaptive radiation, parallel evolution, hybrid speciation
Evolutionary apects of dog domestication and hybridization with wolf
Ptáčníková, Aneta ; Hulva, Pavel (advisor) ; Černá Bolfíková, Barbora (referee)
The domestic dog (Canis lupus familiaris) is one of the most widespread domestic animal species over the world. A lot of scientific studies are focused on explaining the process of dog domestication. However, the results of these studies vary in most cases. The conclusion about the origin of dogs is complicated due to hybridization with their ancestor, the gray wolf (Canis lupus), in ancient times and also because of some archaeological discoveries, which are difficult to identify. The origin of various adaptations during domestication process allows dogs to live alongside humans. These adaptations are related to behavior and food digestion process. Hybridization between dogs and wolves in nature is a current issue. It could threaten the genetic integrity of expanding the European wolf population.
Implemenation of the RAD sequencing methods to the population genetic studies of hedgehogs from the genus Erinaceus
Loudová, Miroslava ; Černá Bolfíková, Barbora (advisor) ; Choleva, Lukáš (referee)
Hedgehogs from the genus Erinaceus are an important model organism for studying the postglacial recolonisation of Europe and the processes that take place in the secondary contact zones of their areas of distribution. In this study, five individuals of white-breasted hedgehog (Erinaceus roumanicus), four individuals of western hedgehog (Erinaceus europaeus) and one estimated hybrid were analysed. Geographical distribution of individuals used in the study covers the region of the Central Europe, however in the further research expansion of analsysed individuals will be needed and the whole Palearct should be sampled. The main goal was to implement novel methods in research of hedgehogs, which will enable to map the population-genomic structure of the genus Erinaceus in western Palearct. The method RADSeq (Restriction site associated DNA sequencing) enables to obtain polymorphic markers, e.g., SNPs which we used (Single Nucleotide Polymorphisms) across the genome. In this work it was analyzed 16382 SNPs. Using the binary data which indicates the presence and absence of SNPs for each species, hypotheses raised under classical analyzes of genetic markers from previous studies have not been fully confirmed. In further research it will be necessary to verify possible occurrence of biases connected with...
Internal structure of the Balkan refugium using Erinaceus roumanicus as a model organism
Eliášová, Kristýna ; Černá Bolfíková, Barbora (advisor) ; Zemanová, Barbora (referee)
The aim of this work was to describe the spatial distribution of genetic variability of the northern white-breasted hedgehog (E. roumanicus), mainly within the Balkan Peninsula and Central Europe, as these areas are crucial for understanding the effects of Pleistocene climate oscillations on the genetic architecture of the species. Based on this spatial distribution, hypotheses about the possible structuring of the Balkan refugia were formulated. A total of 260 individuals and 9 microsatellite loci were used for the analysis. Using the approach of landscape and population genetics several possible isolated subpopulations within the area surveyed were identified. Unique status was proved for a population originating from Crete, probably influenced by mechanisms of island evolution. Differences from the rest of the range were ascertained also in population from the Czech Republic, located in a secondary contact zone with the E. europeaus. The role of interspecific interactions and possible introgression should be considered in this case. In the area of Romania and the area south of the Balkan Peninsula the highest genetic distances between individuals were identified, probably associated with the occurrence of geographical barriers and the possible presence of glacial subrefugia. Other identified...
Evolutionary history of hedgehogs from genus>Erinaceus
Černá Bolfíková, Barbora ; Hulva, Pavel (advisor) ; Janko, Karel (referee) ; Kryštufek, Boris (referee)
Hedgehogs from the genus Erinaceus are extremely interesting and suitable model organisms for studying impacts of climatic changes during Pleistocene on species and speciation processes. Erinaceus europaeus and E. roumanicus, which have diverged in southern refugia, formed a secondary contact zone in Central Europe. The widest part of this zone is situated in Czech Republic. Our work benefits from this position and processes that take place here such as reinforcement, character displacement and hybridization are discussed. Moreover, we addressed several questions about biological invasions and topics connected to peripatric processes. Using combination of nuclear and mitochondrial DNA we detected differences in population structure between the species and also between sexes. E roumanicus is mainly restricted to lowlands. Ranges of both species expand and hybridization may play role during formation of reproductive isolation. We did not observed ecological character displacement when using 3D geometric morphometry approaches. Populations in sympatry are more similar than in allopatry. Our data are enhanced by description of parasite fauna of sympatrical populations and we discuss the role which they may play in evolution of the hedgehogs. Study proceeded in New Zealand was based on comparison of...
Genetic structure of mammalian invasive populations on islands
Loudová, Miroslava ; Černá Bolfíková, Barbora (advisor) ; Hájková, Petra (referee)
Biological invasion is understood as introduction, establishment and expansion of organisms into new, non-native area. This is a natural process that is significantly compounded by human activities and is one of the factors that threaten biological diversity and stability of natural ecosystems. Understanding to the evolution and current status of invasive populations is especially important for planning a project to eradicate invasive species from certain areas to avoid their negative impact on the environment. One option for the research of the invasive populations and their history is the analysis of genetic material. This thesis summarizes the current knowledge on invasive populations of small mammals on the islands, with the focus on genetic studies. Specifically, the study of Norway rats (Rattus norvegicus) on Moturemu island and five archipelagos off the coast of Brittany; black rats (Rattus rattus) on Congo Cay, Madagascar, Guadeloupe Archipelago, Sainte Anne Archipelago and Canary Islands; Pacific rats (Rattus exulans) on Tetiaroa Atoll; house mice (Mus musculus) on Marion Island; house mice (Mus musculus domesticus) on Kerguelen Archipelago; red squirrels (Sciurus vulgaris) on Jersey island, West European hedgehogs (Erinaceus europaeus) in New Zealand; pygmy shrews (Sorex minutus) in Ireland and...
Genetic structure of Central European populations of hedgehogs Erinaceus europaeus and E. roumanicus
Bolfíková, Barbora ; Hulva, Pavel (advisor) ; Bryja, Josef (referee)
In the Czech Republic there is a wide zone of sympatric occurrence of two hedgehog species - Erinaceus europaeus and E. roumanicus, which is of Holocene origin. This work is based on genetic data obtained in 248 specimens, the sampling was focused on the area of Central Europe. We have used 410 bp long partial sequence of mtDNA control region and 9 microsatellite loci. With aid of different methods, we attempted to reveal details of distributions, population structure, demographic history and potential gene flow between both species. We have detected significantly higher occurrence of E. europaeus (3 times) compared to E. roumanicus and the shift of range borders in scale of tens of kilometers in last 30 years. Genetic variability was higher in E. europaeus. In E. roumanicus, there was support for moderate population increase, while the population size in E. europaeus seems to be stable. We have detected deviations from Hardy-Weinberg equilibrium in some loci, which could be ascribed to the Wahlund effect. We did not detect existence of hybridization or introgression, the complete precopulatory reproductive barriers have been formed supposedly. Powered by TCPDF (www.tcpdf.org)
Colonisation of islands by the insectivorous mammals
Matějů, Petr ; Černá Bolfíková, Barbora (advisor) ; Kristýna, Kristýna (referee)
Biological invasions are a serious problem worldwide. Besides the natural colonizations mediated by tectonic movements or formation of a land bridge connection, there are also the artificial ones. Humans can deliberately or undeliberately translocate species across ecosystems. Recently, mainly because of the buisness and tourism there is a dramatical increase in human-mediated biological invasions. Many authors, who discussed invasions in the past, were focused on rodents. Despite its severe impact on the ecosystems the topic of insectivorous mammals remains relatively untouched by scientists so far. Practical part of this thesis is focused on the Northern white-breasted hedgehog (Erinaceus roumanicus) and his dispersal in the Mediterranean area. Mitochondrial control region sequences of 28 samples were analyzed and compared to already published data from GenBank. Discussion was made through phylogenetical analysis. Main topics of discussion were focused on a possible contemporaneity and a course of transfer of the gene flow. Most of the samples showed haplotype similarity with individuals occupying the closest mainland. On the other hand samples from Skyros did not go with the trend. They matched with haplotype from Crete.

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