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Wyświetlanie 1-10 z 228
Tytuł:
Phylogeography and species distinction in Bythinella (Caenogastropoda: Truncatelloidea: Bythinellidae) in Central Europe and the Balkans
Autorzy:
Falniowski, Andrzej
Grego, Jozef
Hofman, Sebastian
Jaszczyńska, Aleksandra
Opis:
Genus Bythinella Moquin-Tandon, 1856 is represented by over 250 nominal species of minute snails, inhabiting springs of Europe and Asia Minor. Wide variability and eco-plasticity of the shell, coupled with not necessarily justified assumptions of complete isolation of the populations inhabiting particular springs, has resulted in chaos in species-level systematics. The aim of the study is to complete and interpret these data, considering the populations from Central Europe and West Balkans not studied so far. Mitochondrial cytochrome oxidase subunit I (COI) as well as five nuclear fragments: histone 3 (H3), ribosomal Internal Transcribed Spacer 1 (ITS-1), ribosomal Internal Transcribed Spacer 2 (ITS-2), 18S ribosomal RNA (18S) and 28S ribosomal RNA (28S) were sequenced. For COI the phylogenetic analysis included all the sequences from GenBank to infer the pattern of evolution as well as species distinction. The specimens were collected at 84 localities in Central and South Europe. For COI 151 specimens were sequenced, 92 of them also for the five nuclear fragments. Together with sequences obtained from GenBank, a total of 1,437 COI sequences from Bythinella were used. There were 206 polymorphic sites, and 360 haplotypes. Among the three techniques for species delimitation used were used, ABGD and ASAP gave the most conservative result: 86 mOTUs, grouped in 19 clades (A-T). New sequences were classified in nine clades. Sympatric occurrence of two mOTUs or even clades was found in as many as 16 springs and even of three mOTUs in two springs. The sympatric occurrence of Bythinella species is thus not exceptional. The morphology of the clades was compared based on: shells, radulae, renal and pallial section of the female reproductive organs and penis with the tubular accessory gland. In general, the morphostatic character of evolution was confirmed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Lartère coeliaque chez les Primates
Badania filogenetyczne nad tętnicą trzewną i jej rozgałęzieniami w szeregu naczelnych
Autorzy:
Grzybowski, Józef [Marian]
Powiązania:
Pamiętnik I-go Zjazdu Anatomiczno-Zoologicznego w Warszawie 30.X-2.XI.1926
Opis:
paper presented on November 2nd, 1926
Strona 104 ; 26 cm
Page 104 ; 26 cm
referat wygłoszony 2 listopada 1926
Dostawca treści:
RCIN - Repozytorium Cyfrowe Instytutów Naukowych
Książka
Tytuł:
Insights into the Phylogeny of the Genus Stentor (Heterotrichea, Ciliophora) with Special Emphasis on the Evolution of the Macronucleus Based on SSU rDNA Data
Autorzy:
Thamm, Markus
Schmidt, Stephanie L.
Bernhard, Detlef
Tematy:
Heterotrichea, Stentor, macronuclear evolution, phylogeny
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Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763792.pdf  Link otwiera się w nowym oknie
Opis:
Representatives of the genus Stentor (Stentoridae, Heterotrichea) are striking ciliates in environmentalwater samples because of their size (up to 4 mm) and their trumpet-like shape. Important for species identification are the following main characteristics: (1) the presence or absence of endosymbiotic algae (zoochlorellae); (2) the colour of the pigmented cortical granules, and (3) the shape of the macronucleus. The complete small subunit rDNA (SSU rDNA) of 19 further representatives of the genus Stentor was sequenced to examine the phylogenetic relationships within this genus and to determine the taxonomic value of these main characteristics. The detailed phylogenetic analyses yielded a separation of all species possessing a single compact macronucleus from those species with an “elongated” macronucleus (moniliform or vermiform). The data also indicate that the uptake of algae as well as the loss of pigmentation happened independently in different lineages. Furthermore, a high level of intraspecific variation within several species was found. Thus, S. muelleri and S. (sp.) cf. katashimai appear to represent distinct species and S. multiformis is composed of a species complex.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Genetic Diversity of Amoebae Belonging to the Genus Mayorella (Amoebozoa, Discosea, Dermamoebida) in Natural Habitats
Autorzy:
Glotova, Anna
Bondarenko, Natalya
Smirnov, Alexey
Tematy:
Amoebozoa
Mayorella
diversity
phylogeny
systematics
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Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/52159697.pdf  Link otwiera się w nowym oknie
Opis:
Amoebae of the genus Mayorella are widespread in marine, freshwater and soil habitats. These amoebae have relatively low number of morphological characters allowing species differentiation, so the number of valid species remains rather small. Representatives of the genus Mayorella are hard to maintain in culture, the very most of them are polyphagous and carnivorous. To live and multiply they require a variety of food objects, including other protists. Thus they are difficult objects for molecular studies. Only two sequences of Mayorella were available until recently in GenBank. For the present study we isolated eight strains of Mayorella from different locations worldwide, documented them with the light microscopy and obtained complete or partial sequences of their 18S rRNA gene. Results show that all members of the genus Mayorella form a robust clade within the order Dermamoebida (Amoebozoa: Discosea). The vast majority of our strains probably represent new species; this evidences that diversity of the genus Mayorella in natural habitats is high and that this genus is rather species-rich, comprising no less than 11 species. Our results show that nowadays sequence data are necessary for reliable identification of Mayorella species. 
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 228

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