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Contrasting seasonal niche separation between rare and abundant taxa conceals the extent of protist diversity 总被引:1,自引:0,他引:1
VIOLA NOLTE RAM VINAY PANDEY STEFFEN JOST RALPH MEDINGER BIRGIT OTTENWÄLDER JENS BOENIGK CHRISTIAN SCHLÖTTERER 《Molecular ecology》2010,19(14):2908-2915
With the advent of molecular methods, it became clear that microbial biodiversity had been vastly underestimated. Since then, species abundance patterns were determined for several environments, but temporal changes in species composition were not studied to the same level of resolution. Using massively parallel sequencing on the 454 GS FLX platform we identified a highly dynamic turnover of the seasonal abundance of protists in the Austrian lake Fuschlsee. We show that seasonal abundance patterns of protists closely match their biogeographic distribution. The stable predominance of few highly abundant taxa, which previously led to the suggestion of a low global protist species richness, is contrasted by a highly dynamic turnover of rare species. We suggest that differential seasonality of rare and abundant protist taxa explains the—so far—conflicting evidence in the ‘everything is everywhere’ dispute. Consequently temporal sampling is basic for adequate diversity and species richness estimates. 相似文献
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LAERTE B. VIOLA MÁRCIA ATTIAS CARMEN S. A. TAKATA MARTA CAMPANER WANDERLEY DE SOUZA ERNEY P. CAMARGO MARTA M. G. TEIXEIRA 《The Journal of eukaryotic microbiology》2009,56(6):594-602
ABSTRACT. We sequenced the small subunit (SSU) rRNA and glycosomal glyceraldehyde-3-phosphate dehydrogenase (gGAPDH) genes of two trypanosomes isolated from the Brazilian snakes Pseudoboa nigra and Crotalus durissus terrificus . Trypanosomes were cultured and their morphometrical and ultrastructural features were characterized by light microscopy and scanning and transmission electron microscopy. Phylogenetic trees inferred using independent or combined SSU rRNA and gGAPDH data sets always clustered the snake trypanosomes together in a clade closest to lizard trypanosomes, forming a strongly supported monophyletic assemblage (i.e. lizard–snake clade). The positioning in the phylogenetic trees and the barcoding based on the variable V7–V8 region of the SSU rRNA, which showed high sequence divergences, allowed us to classify the isolates from distinct snake species as separate species. The isolate from P. nigra is described as a new species, Trypanosoma serpentis n. sp., whereas the isolate from C. d. terrificus is redescribed here as Trypanosoma cascavelli . 相似文献
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EVA Miadoková MARTA Miklovičová VIOLA Dúhova L’UBA Garajová BLANKA Böhmová SVETLANA Podstavková D. Vlček 《Biologia Plantarum》1991,33(2):156-162
The insecticide pyrethroid II, representing synthetic pyrethroids of the second generation, was not found to be mutagenic inSalmonella typhimurium strains TA1535, TA100, TA1538, TA98 and TA97. High concentrations of the tested insecticide inhibited the germination and length of roots of germinating seeds, the height of plants cultivatedin vitro, and slightly increased the frequency of aberrant anaphases and telophase in root-tips ofVicia faba andHordeum vulgare. 相似文献
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