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European Journal of Protistology

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https://www.readbyqxmd.com/read/28319806/description-of-flamella-daurica-n-sp-with-notes-on-the-phylogeny-of-the-genus-flamella-and-related-taxa
#1
Anna Glotova, Alexey Smirnov
A new species of naked amoebae, Flamella daurica (Amoebozoa, Conosa, Variosea), from the Russian Far East is studied and described. In addition, we isolated a strain, identified as Flamella aegyptia from Lake Ontario in Canada. Its SSU rRNA gene sequence is almost identical with that of the type strain, except for the presence of an intron in the SSU sequence. The phylogenetic analysis of a variosean alignment after inclusion of a number of environmental sequences found in GenBank confirmed that the species Talaepolella tubasferens Lahr 2012 is closely related to the Flamella clade but probably represents an independent genus and includes no less than two different species...
March 3, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28314218/microfauna-community-during-pulp-and-paper-wastewater-treatment-in-a-unox-system
#2
Katarzyna Bernat, Dorota Kulikowska, Adam Drzewicki
This study characterized the microfauna community during treatment of pulp and paper wastewater in a UNOX system aerated with pure oxygen, and with a high organic loading rate (0.4±0.06kg BOD/kg MLSSday), low sludge retention time (3.73±0.33 day), and high oxygen concentration (≤20mg O2/L) in comparison to municipal treatment systems. In the aeration tank, temperatures were high, averaging 35.7°C (March-May), then 38.9°C (June-August). Effluent quality was acceptable: 180±22mg COD/L, 7.2±2.1mg BOD5/L, and 33±5mg TSS/L...
March 2, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28292672/contrasting-diversity-of-testate-amoebae-communities-in-sphagnum-and-brown-moss-dominated-patches-in-relation-to-shell-counts
#3
Zuzana Lizoňová, Michal Horsák
Ecological studies of peatland testate amoebae are generally based on totals of 150 individuals per sample. However, the suitability of this standard has never been assessed for alkaline habitats such as spring fens. We explored the differences in testate amoeba diversity between Sphagnum and brown-moss microhabitats at a mire site with a highly diversified moss layer which reflects the small-scale heterogeneity in groundwater chemistry. Relationships between sampling efficiency and sample completeness were explored using individual-based species accumulation curves and the effort required to gain an extra species was assessed...
February 24, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28193597/discomorphella-pedroeneasi-sp-nov-ciliophora-odontostomatida-an-anaerobic-ciliate-hosting-multiple-cytoplasmic-and-macronuclear-endocytobionts
#4
Thiago da Silva Paiva, Gabriela Cristina Küppers, Daniel José Galafasse Lahr, Michael Schweikert, Inácio Domingos da Silva-Neto
Odontostomatids are among the less studied representatives of the Ciliophora. They are anaerobic microeukaryotes usually occurring as rare species in sapropelic environments. Here we describe a novel species of Discomorphella, named Discomorphella pedroeneasi sp. nov., using light and electron microscopy observations. Discomorphella pedroeneasi displays many complex morphological features, for which new terms are introduced, such as the auricules, epistomial fringe spacer, frontal awning, odontostomatid ciliary sockets, oral lips and ventral flap...
January 19, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28131037/the-effect-of-three-different-predatory-ciliate-species-on-activated-sludge-microfauna
#5
Agnieszka Pajdak-Stós, Mateusz Sobczyk, Edyta Fiałkowska, Wioleta Kocerba-Soroka, Janusz Fyda
Bacterivorous ciliates play important roles in the functioning of activated sludge by reducing dispersed bacteria and enhancing flocculation. There are, however, no data on the resistance of this functional group of microorganisms to predation. Our experiment was conducted with activated sludge subsamples subjected to artificially introduced three predatory ciliates species. The two predator species originating from activated sludge were Oxytricha sp. and Spathidium spathula. Dileptus margaritifer was a "foreign" predator species...
January 9, 2017: European Journal of Protistology
https://www.readbyqxmd.com/read/28132751/report-of-the-2016-protistology-uk-spring-meeting
#6
Hunter N Hines, Genoveva F Esteban
No abstract text is available yet for this article.
December 28, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28092805/circumstantial-evidence-of-life-history-events-in-loricate-choanoflagellates
#7
Helge Abildhauge Thomsen, Jette Buch Østergaard
Sex is found in all major eukaryotic groups of organisms. It has been known for some time that the choanoflagellates also possess the genes involved in meiosis and a full sexual cycle was also recently accounted for in Salpingoeca rosetta. With reference to the loricate choanoflagellates the current status is that only circumstantial evidence, from wild material of Bicosta spinifera, exists in favour of documenting division patterns that go beyond plain asexual division, and that has the potential to represent stages in a sexual life cycle...
December 27, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28222945/nad9-nad7-mitochondrial-nicotinamide-adenine-dinucleotide-dehydrogenase-gene-a-new-holy-grail-phylogenetic-and-dna-barcoding-marker-for-arcellinida-amoebozoa
#8
Quentin Blandenier, Enrique Lara, Edward A D Mitchell, Daniel M C Alcantara, Ferry J Siemensma, Milcho Todorov, Daniel J G Lahr
Molecular phylogeny is an indispensable tool for assessing evolutionary relationships among protists. The most commonly used marker is the small subunit ribosomal RNA gene, a conserved gene present in many copies in the nuclear genomes. However, this marker is not variable enough at a fine-level taxonomic scale, and intra-genomic polymorphism has already been reported. Finding a marker that could be useful at both deep and fine taxonomic resolution levels seemed like a utopic dream. We designed Amoebozoa-specific primers to amplify a region including partial sequences of two subunits of the mitochondrial nicotinamide adenine dinucleotide dehydrogenase gene (NAD9/NAD7)...
December 23, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28135687/n-6-methyladenine-dna-modification-in-the-unicellular-eukaryotic-organism-tetrahymena-thermophila
#9
Yuanyuan Wang, Yalan Sheng, Yongqiang Liu, Bo Pan, Jie Huang, Alan Warren, Shan Gao
N(6)-methyladenine DNA (6mA) modification exists in both prokaryotes and eukaryotes in which it plays a crucial role in regulating numerous biological processes. In prokaryotes, 6mA is a marker to distinguish self from foreign DNA. Its role in eukaryotes, however, remains elusive. Ciliates were among the first eukaryotes reported to contain 6mA. In the model organism T. thermophila, cellular localization and features of 6mA have been extensively studied, especially in ribosomal DNA (rDNA) molecules. Here, we summarize the features and potential functions of 6mA in Tetrahymena thermophila and other ciliates, and the major findings and contributions of the Tetrahymena model in studies of 6mA methylation...
December 23, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28007429/redescription-and-molecular-phylogeny-of-the-type-species-for-two-main-metopid-genera-metopus-es-m%C3%A3-ller-1776-lauterborn-1916-and-brachonella-contorta-levander-1894-jankowski-1964-metopida-ciliophora-based-on-broad-geographic-sampling
#10
William Bourland, Johana Rotterová, Ivan Čepička
Metopid ciliates occupy terrestrial, freshwater, and marine habitats worldwide, playing important roles as predominant consumers of bacteria, flagellates, algae, and diatoms in hypoxic environments. Metopus and Brachonella are the most species-rich metopid genera, however most of their species have not been studied by modern methods Here, we report the morphologic, morphometric and molecular characterization, and phylogeny of Metopus es and Brachonella contorta, both types of their respective genera, collected in a broad global sampling effort...
December 19, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28131035/a-huge-diversity-of-metopids-ciliophora-armophorea-in-soil-from-the-murray-river-floodplain-australia-i-description-of-five-new-species-and-redescription-of-metopus-setosus-kahl-1927
#11
Peter Vďačný, Wilhelm Foissner
Six metopid ciliates from soil of the Murray River floodplain in Australia were studied using live observation, various silver impregnation methods, scanning electron microscopy, and multivariate statistics. One of the species is affiliated with M. setosus while the others represent new taxa. Metopus filum nov. spec. is distinguished from most congeners by the slender body, the absence of cortical granules, and the low number of ciliary rows and adoral polykinetids. Metopus palaeformides nov. spec. most resembles Heterometopus palaeformis (Kahl, 1927) Foissner, 2016b but they can be distinguished by body size, the number of adoral polykinetids, and the oral area pattern...
December 13, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28092806/life-cycle-ultrastructure-and-phylogeny-of-parvilucifera-corolla-sp-nov-alveolata-perkinsozoa-a-parasitoid-of-dinoflagellates
#12
Albert Reñé, Elisabet Alacid, Rosa Isabel Figueroa, Francisco Rodríguez, Esther Garcés
Recent studies of marine protists have revealed parasites to be key components of marine communities. Here we describe a new species of the parasitoid genus Parvilucifera that was observed infecting the dinoflagellate Durinskia baltica in salt marshes of the Catalan coast (NW Mediterranean). In parallel, the same species was detected after the incubation of seawater from the Canary Islands (Lanzarote, NE Atlantic). The successful isolation of strains from both localities allowed description of the life cycle, ultrastructure, and phylogeny of the species...
December 13, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28088729/new-insights-into-aox2-transcriptional-regulation-in-chlamydomonas-reinhardtii
#13
Mariya Ostroukhova, Zhanneta Zalutskaya, Elena Ermilova
A feature of the mitochondrial electron transport chain in plants, some protists and many fungi is the presence of two terminal oxidases, the energy-conserving cytochrome oxidase and another termed alternative oxidase (AOX). AOX branches from the main respiratory chain, directly coupling the oxidation of ubiquinol with reduction of oxygen to water. The AOX genes can be divided into two discrete subfamilies, AOX1 and AOX2. Although AOX has been proposed to play essential roles in stress tolerance of organisms, the role of subfamily AOX2 is largely unknown...
December 13, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28131036/morphological-description-of-two-new-ciliates-ciliophora-karyorelictea-cryptopharyngidae-apocryptopharynx-discoidalis-spec-nov-and-cryptopharynx-minutus-spec-nov
#14
Yuan Xu, Xinpeng Fan, Saleh A Al-Farraj, Xiaozhong Hu
The karyorelictids, a highly specialized group of ciliates, mostly inhabit marine biotopes, and there is very little information about their diversity, taxonomy, and systematics. The present paper investigates two new cryptopharyngid ciliates, Apocryptopharynx discoidalis spec. nov. and Cryptopharynx minutus spec. nov., which were isolated from the intertidal zone of Diaosuyuan Beach in Qingdao, China. Apocryptopharynx discoidalis spec. nov. can be distinguished from related species by its oval discoid body shape and highly structured epipellicular scales covering the left lateral surface...
December 2, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28073604/morphometric-and-genetic-analysis-of-arcella-intermedia-and-arcella-intermedia-laevis-amoebozoa-arcellinida-illuminate-phenotypic-plasticity-in-microbial-eukaryotes
#15
Alfredo L Porfírio-Sousa, Giulia M Ribeiro, Daniel J G Lahr
Testate amoebae are eukaryotic microorganisms characterized by the presence of an external shell (test). The shell morphology is used as a diagnostic character, but discordance between morphological and molecular data has been demonstrated in groups of arcellinids (Amoebozoa), one of the principal groups of testate amoebae. Morphology of the test is supposed to differentiate genera and species and it is applied in ecological, monitoring and paleontological studies. However, if phenotype does not reflect genotype, conclusions in these types of studies become severely impaired...
November 25, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28073072/life-cycle-of-blastocrithidia-papi-sp-n-kinetoplastea-trypanosomatidae-in-pyrrhocoris-apterus-hemiptera-pyrrhocoridae
#16
Alexander O Frolov, Marina N Malysheva, Anna I Ganyukova, Vyacheslav Yurchenko, Alexei Y Kostygov
Blastocrithidia papi sp. n. is a cyst-forming trypanosomatid parasitizing firebugs (Pyrrhocoris apterus). It is a member of the Blastocrithidia clade and a very close relative of B. largi, to which it is almost identical through its SSU rRNA gene sequence. However, considering the SL RNA gene these two species represent quite distinct, not even related typing units. Morphological analysis of the new species revealed peculiar or even unique features, which may be useful for future taxonomic revision of the genus Blastocrithidia...
November 16, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28073071/morphology-of-four-new-solitary-sessile-peritrich-ciliates-from-the-yellow-sea-china-with-description-of-an-unidentified-species-of-paravorticella-ciliophora-peritrichia
#17
Ping Sun, Saleh A Al-Farraj, Alan Warren, Honggang Ma
Sessile peritrichs are a large assemblage of ciliates that have a wide distribution in soil, freshwater and marine waters. Here, we document four new and one unidentified species of solitary sessile peritrichs from aquaculture ponds and coastal waters of the northern Yellow Sea, China. Based on their living morphology, infraciliature and silverline system, four of the five forms were identified as new members belonging to one of three genera, Vorticella, Pseudovorticella and Scyphidia, representing two families, Vorticellidae and Scyphidiidae...
November 14, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28011296/bridging-the-gap-between-morphological-species-and-molecular-barcodes-exemplified-by-loricate-choanoflagellates
#18
Nitsche Frank, Thomsen Helge Abuldhauge, Richter Daniel J
Translating the vast amounts of molecular barcodes from global surveys of microbial eukaryotes into ecological insight depends critically on a well-curated reference database with adequate taxonomic coverage. In this respect, the choanoflagellates resemble other eukaryotic lineages: reasonable coverage at higher taxonomic levels, but missing diversity at the species level. The acanthoecid (loricate) choanoflagellates are well-characterized morphologically, with over 115 species described, but less than 10% with any sequence data...
November 9, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28011294/sea-ice-eukaryotes-of-the-gulf-of-finland-baltic-sea-and-evidence-for-herbivory-on-weakly-shade-adapted-ice-algae
#19
Markus Majaneva, Jaanika Blomster, Susann Müller, Riitta Autio, Sanna Majaneva, Kirsi Hyytiäinen, Satoshi Nagai, Janne-Markus Rintala
To determine community composition and physiological status of early spring sea-ice organisms, we collected sea-ice, slush and under-ice water samples from the Baltic Sea. We combined light microscopy, HPLC pigment analysis and pyrosequencing, and related the biomass and physiological status of sea-ice algae with the protistan community composition in a new way in the area. In terms of biomass, centric diatoms including a distinct Melosira arctica bloom in the upper intermediate section of the fast ice, dinoflagellates, euglenoids and the cyanobacterium Aphanizomenon sp...
October 24, 2016: European Journal of Protistology
https://www.readbyqxmd.com/read/28011295/historical-trends-in-the-species-inventory-of-tintinnids-ciliates-of-the-microzooplankton-in-the-bay-of-villefranche-nw-mediterranean-sea-shifting-baselines
#20
John R Dolan
In the Bay of Villefranche, tintinnid ciliates have been studied since 1879 yielding a unique time series. The species inventory, excluding likely synonymous records, numbers 108. Temporal increases in the inventory appear linearly related to sampling effort up until the 2000s with a cumulative sampling effort of about 200 dates. Subsequently, with a large increase in sampling to currently over 460 dates, the rate of increases in species numbers declines. Surprisingly, the inventory is not highly inflated by unique occurrences, as species found but once are only 17 out of the 108...
October 21, 2016: European Journal of Protistology
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