scholarly journals Diversity patterns of planktonic microeukaryote communities in tropical floodplain lakes based on 18S rDNA gene sequences

2019 ◽  
Vol 41 (3) ◽  
pp. 241-256 ◽  
Author(s):  
Karine Borges Machado ◽  
Cíntia Pelegrineti Targueta ◽  
Adriana Maria Antunes ◽  
Thannya Nascimento Soares ◽  
Mariana Pires de Campos Telles ◽  
...  
Keyword(s):  
18S Rdna ◽  
Environmental Variables ◽  
Geographic Distance ◽  
Floodplain Lakes ◽  
Extrinsic Factors ◽  
Biogeographic Patterns ◽  
Rdna Gene ◽  
Central Brazil ◽  
Araguaia River ◽  
18S Rdna Gene

AbstractThe aquatic microbiota plays key roles in ecosystem processes; however, the mechanisms that influence their biogeographic patterns are not yet fully understood. Using high-throughput 18S rDNA gene sequencing, we investigated the composition of planktonic microeukaryotes (organisms sampled using a 68-μm plankton net) in 27 floodplain lakes of the Araguaia River, central Brazil and explored the influence of environmental and spatial factors for communities considering taxonomic and trophic groups. Of the 807 operational taxonomic units (OTUs) observed, Chlorophyta and Charophyta were the groups with greater abundance. Beta diversity was high, and the similarity of communities decreased as the geographic distance increased. We found a shared explanation between environmental and spatial predictors for total and autotrophic microbiota. Environmental variables influence only mixotrophic microbiota. These results suggest an OTU turnover along the floodplain and a spatially structured composition. This spatial pattern can be derived from the association with extrinsic factors, such as spatially structured environmental variables, that generate spatial dependence. However, the relationship between the composition of microbiota and environmental conditions is still unclear.

Hemiflagellochloris (Chlorophyceae, Chlorophyta), a new for Russian flora genus of green algae

2014 ◽  
Vol 48 ◽  
pp. 104-113
Author(s):  
A. D. Temraleeva ◽  
E. V. Mincheva ◽  
Yu. S. Bukin ◽  
M. V. Eltsov ◽  
V. A. Demkin ◽  
...  
Keyword(s):  
Green Algae ◽  
Molecular Analysis ◽  
18S Rdna ◽  
Phylogenetic Position ◽  
Rdna Gene ◽  
Algal Strain ◽  
The North ◽  
Volgograd Region ◽  
First Time ◽  
18S Rdna Gene

The genus Hemiflagellochloris Watanabe et al. was found in Russia for the first time. The algal strain was isolated from a buried solonetz in the zone of dry steppes (the north-end of Ergeni Hills, Volgograd Region). The morphology and ecology of this isolate are described. Its phylogenetic position within Chlorophyceae is determined by molecular analysis of 18S rDNA gene.

scholarly journals Myxobolus marajoensis sp. n. (Myxosporea: Myxobolidae), parasite of the freshwater catfish Rhamdia quelen from the Brazilian Amazon region

2017 ◽  
Vol 26 (4) ◽  
pp. 465-471 ◽  
Author(s):  
Jacqueline Abrunhosa ◽  
José Ledamir Sindeaux-Neto ◽  
Ândrea Kely dos Santos ◽  
Igor Hamoy ◽  
Edilson Matos
Keyword(s):  
New Species ◽  
18S Rdna ◽  
Phylogenetic Analyses ◽  
Muscle Layer ◽  
Gene Sequences ◽  
Fishery Resource ◽  
Rdna Gene ◽  
Brazilian Amazon Region ◽  
Rhamdia Quelen ◽  
18S Rdna Gene

Abstract This study provides morphological and molecular data of a new parasite species found in the muscle layer of the intestinal tract of the South American silver catfish, Rhamdia quelen from Marajó Island region (Pará State, Brazil), an important fishery resource with recognized potential for fish farming. The morphology of these parasites was reanalyzed and phylogenetic analyses were run on their 18S rDNA gene sequences. The spores were morphologically distinct from those of other Myxobolus species described previously. The obtained partial sequence of the 18S rDNA gene sequences of the new species were compared to those of 24 other Myxobolus and Henneguya species available in GenBank. The results of morphological and molecular analyses indicated clearly the existence of a new species, Myxobolus marajoensis sp. n.

Phytoplankton diversity (alpha, beta, and gamma) from the Araguaia River tropical floodplain lakes (central Brazil)

Hydrobiologia ◽  
2006 ◽  
Vol 575 (1) ◽  
pp. 455-461 ◽  
Author(s):  
João C. Nabout ◽  
Ina S. de Nogueira ◽  
Leandro G. de Oliveira ◽  
Raquel R. Morais
Keyword(s):  
Floodplain Lakes ◽  
Phytoplankton Diversity ◽  
Central Brazil ◽  
Araguaia River ◽  
Alpha Beta ◽  
Tropical Floodplain

Polymorphisms in the 18S rDNA gene of Cystoisospora belli and clinical features of cystoisosporosis in HIV-infected patients

2010 ◽  
Vol 108 (3) ◽  
pp. 679-685 ◽  
Author(s):  
Deisy V. Resende ◽  
André L. Pedrosa ◽  
Dalmo Correia ◽  
Marlene Cabrine-Santos ◽  
Eliane Lages-Silva ◽  
...  
Keyword(s):  
Clinical Features ◽  
18S Rdna ◽  
Rdna Gene ◽  
18S Rdna Gene

Taenia spp.: 18S rDNA microsatellites for molecular systematic diagnosis

2005 ◽  
Vol 79 (2) ◽  
pp. 139-142 ◽  
Author(s):  
P. Foronda ◽  
J.C. Casanova ◽  
E. Martinez ◽  
B. Valladares ◽  
C. Feliu
Keyword(s):  
Canary Islands ◽  
18S Rdna ◽  
Oryctolagus Cuniculus ◽  
Wild Rabbit ◽  
Molecular Systematic ◽  
Rdna Gene ◽  
Larval Stages ◽  
First Time ◽  
18S Rdna Gene ◽  
Taenia Parva

AbstractThe 18S rDNA gene of adult worms of Taenia parva found in Genetta genetta in the Iberian Peninsula and larval stages of T. pisiformis from the wild rabbit (Oryctolagus cuniculus) in Tenerife (Canary Islands) were amplified and sequenced. The sequences of the 18S rDNA gene of T. parva (1768 bp) and T. pisiformis (1760 bp) are reported for the first time (GenBank accession nos. AJ555167–AJ555168 and AJ555169–AJ555170, respectively). In 168 alignment positions microsatellites in the 18S rDNA of both taxa were detected for the first time (TGC in T. parva and TGCT in T. pisiformis) and differences in their sequences with different repetition numbers were observed. The use of nucleotide sequences of this gene in the resolution of systematic problems in cestodes is discussed with reference to the systematic status of Taenia spp. and mainly in human taeniids such as T. solium, T. saginata, and Asian human isolates of Taenia.

A preliminary phylogenetic analysis of the Cymbellales based on 18S rDNA gene sequencing

2011 ◽  
Vol 26 (3) ◽  
pp. 305-315 ◽  
Author(s):  
Lenaïg Kermarrec ◽  
Luc Ector ◽  
Agnès Bouchez ◽  
Frédéric Rimet ◽  
Lucien Hoffmann
Keyword(s):  
Phylogenetic Analysis ◽  
18S Rdna ◽  
Gene Sequencing ◽  
Rdna Gene ◽  
18S Rdna Gene ◽  
Preliminary Phylogenetic Analysis

scholarly journals A snapshot of the limnological features in tropical floodplain lakes: the relative influence of climate and land use

2019 ◽  
Vol 31 ◽  
Author(s):  
Maria Tereza Ribeiro Alves ◽  
Karine Borges Machado ◽  
Manuel Eduardo Ferreira ◽  
Ludgero Cardoso Galli Vieira ◽  
João Carlos Nabout
Keyword(s):  
Land Use ◽  
Global Climate ◽  
Floodplain Lakes ◽  
Relative Influence ◽  
Large Spatial Scale ◽  
Climate Conditions ◽  
Central Brazil ◽  
Remnant Vegetation ◽  
Temperature And Precipitation ◽  
Araguaia River

Abstract Aim This study aimed to investigate the relative influence of climate (temperature and precipitation) and land use on limnological features of 30 floodplain lakes in the Araguaia River, in Central Brazil, an important river that drains in the Brazilian Cerrado. Methods The lakes were sampled in one same period, at a large spatial scale (900 km along the river) covering climate and landscape variability. For decomposing the relative importance of land use and climate, we used the RDA and partitioning variance techniques. Results The lakes presented limnological gradient along the floodplain; in general, the lakes presented low transparency, nutrients concentrations (total nitrogen and total phosphorus) and oxygen saturation. The water pH was considered weakly acidic. Considering land use in Araguaia river basin, lakes in downstream presented more remnant vegetation and lakes in upstream presented more livestock and agriculture soil use. The climate conditions were the most important in explaining the variation in limnological characteristics of the lakes, while the individual analysis of limnological variables showed that land use was important to explain to the pH and transparency of the water. Conclusions Finally, this study showed the importance of investigating regional climatic attributes and land use information to explain the limnological characterization of floodplain lakes. Thus, it highlights the importance of the possible impacts of global climate change on limnological conditions.

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