Read by QxMD icon Read

European Journal of Protistology

Tomasz Mieczan, Małgorzata Adamczuk, Magdalena Pogorzelec
There is almost no information on how restoration of Sphagnum-dominated peatbogs, and in particular removal of reeds, affects the functioning of ciliate communities. Changes in vegetation patterns caused by restoration procedures may take years to be observed, while microbial processes already display effects after short-term exposure to changes in environmental conditions due to restoration. Based on the results of a long-term study, we assumed that mowing down of reeds causes changes in the physicochemical properties of peatbog water and sought to answer the question of how ciliate communities react to these changes and whether these microorganisms can play a significant role as bioindicators in evaluating the restoration process...
October 20, 2017: European Journal of Protistology
Akira Ito, Toshihiro Tokiwa
We described the infraciliature of Opisthotrichum janus, Epidinium ecaudatum, and Ophryoscolex purkynjei, belonging to the family Ophryoscolecidae, from pyridinated silver carbonate impregnated specimens. The adoral polybrachykinety is C-shaped in Opi. janus, whereas it is spiral-shaped in Epi. ecaudatum and Oph. purkynjei. The vestibular polybrachykinety is slender and short in Opi. janus, whereas slender and long in Epi. ecaudatum and Oph. purkynjei. The paralabial kineties are composed of several short kineties along the adoral polybrachykinety...
October 20, 2017: European Journal of Protistology
Yuan Wang, Xin-Cang Li, Guihong Fu, Shu Zhao, Yuange Chen, Hao Wang, Tiantian Chen, Junfang Zhou, Wenhong Fang
Ameson portunus n. sp. is a new microsporidian species that infects the skeletal muscle of Portunus trituberculatus, a pond-reared swimming crab from China. This parasite was characterized using morphological and molecular phylogenetic data. Light and transmission electron microscopy revealed that this microsporidian experienced disporogonic and polysporogonic (chain-like) life cycles. Mature uninucleate spores appeared ovoid, measured 1.4±0.06×1.0±0.07μm on ultrathin sections, and exhibited no dimorphism...
September 27, 2017: European Journal of Protistology
Ekaterina Volkova, Alexander Kudryavtsev
Two strains of lobose amoebae have been isolated from the deep-sea bottom sediments of the Sea of Japan (3.6km deep) and Western Atlantic Ocean (5.1km deep). Amoebae of both strains have a dactylopodial mophotype, intracellular kinetoplastid symbiont (Perkinsela-like organism) and have no microscales on the cell surface. The morphology and molecular data of the Sea of Japan strain allow us to unambiguously identify it as Neoparamoeba aestuarina (Page, 1970). At the same time, the Atlantic strain is described as a new species Neoparamoeba longipodia as it differs from other species of the genus Neoparamoeba in morphology and gene sequence data...
September 21, 2017: European Journal of Protistology
Yuri A Mazei, Andrey N Tsyganov, Anton S Esaulov, Alexander Yu Tychkov, Richard J Payne
Testate amoebae are widely used in ecological and palaeoecological studies of peatlands, particularly as indicators of surface wetness. To ensure data are robust and comparable it is important to consider methodological factors which may affect results. One significant question which has not been directly addressed in previous studies is how sample size (expressed here as number of Sphagnum stems) affects data quality. In three contrasting locations in a Russian peatland we extracted samples of differing size, analysed testate amoebae and calculated a number of widely-used indices: species richness, Simpson diversity, compositional dissimilarity from the largest sample and transfer function predictions of water table depth...
September 21, 2017: European Journal of Protistology
Jitka Prediger, Michaela Horčičková, Lada Hofmannová, Bohumil Sak, Nicola Ferrari, Maria Vittoria Mazzamuto, Claudia Romeo, Lucas A Wauters, John McEvoy, Martin Kváč
The present study was undertaken to describe Cryptosporidium spp. infection in tree squirrels from 17 locations in Northern Italy. A total of 357 squirrels were examined, including species native to Europe (Sciurus vulgaris; n=123), and species introduced from North America (Sciurus carolinensis; n=162) and Southeast Asia (Callosciurus erythraeus; n=72). Faecal samples of all squirrels were examined for the presence of Cryptosporidium infection by microscopy (flotation method) and PCR/sequence analysis of the Cryptosporidium 18S rRNA, actin, and gp60 genes...
September 21, 2017: European Journal of Protistology
Thomas Cavalier-Smith
Uniquely in eukaryotes, euglenoid pellicles comprise longitudinal proteinaceous, epiplasmic strips underlain by microtubules. Contradictory interpretations of pellicle microtubule duplication and segregation assumed opposite microtubule polarity from kinetoplastid Euglenozoa and conservative microtubule segregation. Distigma shows new pellicle microtubules nucleating posteriorly as in trypanosomatids, unifying euglenoid and kinetoplastid pellicle morphogenesis, but strip-growth is unpolarised. Epiplasmic insertion and cutting make new strip junctions between alternating wide and narrow daughter strips that grow intussusceptively...
September 18, 2017: European Journal of Protistology
Andrey N Tsyganov, Anastasia V Shatilovich, Anton S Esaulov, Viktor A Chernyshov, Natalia G Mazei, Elena A Malysheva, Yuri A Mazei
The genus Euglypha contains the largest number of filose testate amoeba taxa which were mainly described based on the morphological characteristics of shells. Despite the increasing amount of molecular data, the phylogenetic relationships within the genus Euglypha remain unresolved. In this work we provide new data on SSU rRNA gene sequences, light and electron microscopy for the two euglyphid species Euglypha bryophilaBrown, 1911 and Euglypha cristataLeidy, 1874. Both species are characterised by the presence of a turf of spines on the aboral pole of the shells but differ in shell cross sections (elliptical and circular, respectively)...
September 18, 2017: European Journal of Protistology
Alexander Kudryavtsev, Anna Gladkikh
Two new species, Ripella decalvata and R. tribonemae (Amoebozoa, Vannellida), are described and the diversity of known strains assigned to the genus analyzed. Ripella spp. are closely similar to each other in the light microscopic characters and sequences of small-subunit (SSU) ribosomal RNA gene, but differences in the cell coat structure and cytochrome oxidase (COI) gene sequences are more prominent. SSU rRNA in R. platypodia CCAP1589/2, R. decalvata and R. tribonemae demonstrates an unusual pattern of intragenomic variation...
September 14, 2017: European Journal of Protistology
Jingyi Wang, Shuyan Qi, Lingyun Chen, Alan Warren, Miao Miao, Chen Shao
Morphogenesis in a population of Urosoma salmastra collected from saline soil in Weinan, China, was investigated using protargol staining. The main morphogenetic event that characterizes U. salmastra is the inclusion of cirrus III/2 in the formation of the frontoventra-transverse cirral anlagen. We also provide small subunit ribosomal DNA gene sequences for a population of U. salmastra and for two populations of U. emarginata. The molecular phylogeny indicates that Urosoma is not monophyletic, viz, U. emarginata branches separately from its congeners and the closest relative of U...
September 6, 2017: European Journal of Protistology
Daniel E Jasso-Selles, Francesca De Martini, Katalina D Freeman, Mikaela D Garcia, Trevor L Merrell, Rudolf H Scheffrahn, Gillian H Gile
The subterranean termite Heterotermes aureus is endemic to arid regions of southwestern USA and northern Mexico. Like other termites in the family Rhinotermitidae, it harbors a community of protists (Phylum Parabasalia) in its hindgut that aid in cellulose digestion. We investigated the hindgut community of H. aureus using light microscopy, single cell isolation, and high throughput amplicon sequencing. Here we describe four new parabasalid species from the classes Trichonymphea and Spirotrichonymphea. Three of the new species include Pseudotrichonympha aurea (Trichonymphea), Holomastigotoides aureus, and Holomastigotoides oxyrhynchus (Spirotrichonymphea)...
September 6, 2017: European Journal of Protistology
Tomáš Tyml, Iva Dyková
Morphological and molecular characterizations of three newly isolated tubulinean strains and re-examination of five strains formerly considered representatives of Saccamoeba and one strain formerly considered as Trichamoeba resulted in (a) the determination of strain BA02, isolated from a dripping rock ledge in Skansbukta (Billefjorden, Svalbard), as a new representative of Ptolemeba bulliensis Brown et al., 2014; (b) identification of strain ATCC(®) 50249™, deposited in the American Type Culture Collection as Trichamoeba, as the same species (P...
August 26, 2017: European Journal of Protistology
Song Li, William A Bourland, Saleh A Al-Farraj, Lifang Li, Xiaozhong Hu
Most species in the anaerobic ciliate family Caenomorphidae Poche, 1913 lack detailed descriptions based on modern morphologic and molecular methods. In this report, two species, Caenomorpha medusula Perty, 1852 and Sulfonecta uniserialis (Levander, 1894) Jankowski, 1978, were isolated from freshwater anaerobic sediments in Qingdao, China. Another population of C. medusula was recorded from Boise, Idaho, USA. We reinvestigated live morphology, ciliature, and the small-subunit (SSU) rRNA gene sequence of both species...
August 10, 2017: European Journal of Protistology
Jiří Vávra, Miroslav Hyliš, Ivan Fiala, Veronika Sacherová, Charles R Vossbrinck
Structural, molecular and life cycle data are presented for two microsporidian species of the genus Berwaldia: B. singularis Larsson, 1981 (type species of the genus) and B. schaefernai Vávra and Larsson, 1994, parasites of Daphnia pulex Leydig, 1860 and Daphnia galeata Sars, 1863, respectively. Analysis of the SSU rDNA gene confirmed the species status of both species and showed that the GenBank sequence data submitted previously in GenBank for the genus Berwaldia, are from microsporidia that are not Berwaldia...
August 3, 2017: European Journal of Protistology
Kyung-Min Park, Namyi Chae, Jae-Ho Jung, Gi-Sik Min, Sanghee Kim, Helmut Berger
The morphology of Keronopsis helluo Penard, 1922, type species of Keronopsis, and Paraholosticha pannonica Gellért and Tamás, 1959, two little-known members of the Keronopsidae Jankowski, 1979, was described using standard methods. In addition, we sequenced the SSU rRNA of both species. Keronopsis helluo was isolated from a mossy soil from Robert Island (Antarctica) while P. pannonica was found in terrestrial moss from Alaska. Our data correspond very well with the original descriptions. The frontal ciliature of K...
August 2017: European Journal of Protistology
Helen M Roe, Suzanne M Elliott, R Timothy Patterson
Testate amoeba-derived transfer functions are frequently used in peatland palaeohydrological studies and involve the development of training sets from surficial peats. However, within acrotelmic peats, considerable vertical variation in assemblage composition can occur, particularly along Sphagnum stems, which may limit the representation of the associated 'contemporary' testate amoeba samples as analogues for the peatland surface. This paper presents contiguous testate amoeba assemblage data from nine monoliths collected from different peatland microforms (hummock, hollow, lawn) in three Sphagnum dominated ombrotrophic peatlands in Ontario and Quebec, eastern Canada...
August 2017: European Journal of Protistology
Sebastian Dirren, Gianna Pitsch, Marisa O D Silva, Thomas Posch
During the last decades, the planktonic cyanobacterium Planktothrix rubescens became a dominant primary producer in many deep pre-alpine lakes. While altered physiochemical conditions due to lake warming seem to favour this cyanobacterial species, its dominance is partly attributed to factors conferring grazing resistance. The rigid structure of the cyanobacterial filaments and toxic secondary metabolites (e.g. microcystins) protect against diverse grazers. Nonetheless, species of the protistan genus Nuclearia (Nucleariidae, Opisthokonta) are able to overcome this grazing protection...
August 2017: European Journal of Protistology
Kenneth Dumack, Sebastian Flues, Karoline Hermanns, Michael Bonkowski
Cercozoa are a highly diverse protist phylum in soils and in the phyllosphere of plants. Many families are still poorly described and the vast majority of species are still unknown. Although testate amoebae are among the better-studied protists, only little quantitative information exists on the morphology, phylogeny and ecology of cercozoan Rhogostomidae. We cultured four different strains of Rhogostoma spp. isolated from Arabidopsis leaves, agricultural soil and rhizosphere soil of Ocimum basilicum and Nicotiana sp...
August 2017: European Journal of Protistology
Akira Ito, Winnie Eckardt, Tara S Stoinski, Thomas R Gillespie, Toshihiro Tokiwa
A new entodiniomorphid ciliate species, Gorilloflasca africana n. g., n. sp. was described from the Virunga mountain gorillas, Gorilla beringei beringei, in Rwanda. It is characterized by a flask-shaped body, a long tubular vestibulum, a round frontal lobe, a large posterior cavity, an ellipsoidal or peanut-shaped macronucleus and a single contractile vacuole. G. africana has the adoral and the vestibular ciliary zones in the buccal area. The adoral ciliary zone is non-retractable, encircling the vestibular opening...
August 2017: European Journal of Protistology
Sonja Rueckert, Dušan Devetak
Gregarine apicomplexans are unicellular organisms that infect invertebrate hosts in marine, freshwater and terrestrial habitats. The largest group of invertebrates infested on land is the insects. The insect order Psocoptera (booklice) has recently gained wider interest due to specimens occurring in stored food products and therefore being considered pest organisms. Biological control agents are often used to eliminate pest organisms. In this study we examined the psocid Dorypteryx domestica, an invasive psocid species that is spreading all over the world...
August 2017: European Journal of Protistology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"