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Université de Neuchâtel

Eight species in the Nebela collaris complex : Nebela gimlii (Arcellinida,Hyalospheniidae), a new species described from a Swiss raised bog

Singer, David ; Kosakyan, Anush ; Pillonel, Amandine ; Mitchell, Edward A.D ; Lara, Enrique

In: European Journal of Protistology, 2015, vol. 51, no. 1, p. 79-85

We describe here a new species of sphagnicolous testate amoeba found abundantly in the forested part of the Le Cachot peatland (Jura Mountains, Neuchâtel, Switzerland) based on microscopical observations (LM, SEM). The new species, called Nebela gimlii was placed in a phylogenetic tree based on mitochondrial cytochrome oxidase sequences (COI), and branched robustly within the N....

Université de Neuchâtel

Microbial eukaryote communities exhibit robust biogeographical patterns along a gradient of Patagonian and Antarctic lakes

Schiaffino, M. Romina ; Lara, Enrique ; Fernández, Leonardo D ; Balagué, Vanessa ; Singer, David ; Seppey, Christophe C. W ; Massana, Ramon ; Izaguirre, Irina

In: Environmental Microbiology, 2016, vol. 18, no. 12, p. 5249–5264

Microbial eukaryotes play important roles in aquatic ecosystem functioning. Unravelling their distribution patterns and biogeography provides important baseline information to infer the underlying mechanisms that regulate the biodiversity and complexity of ecosystems. We studied the distribution patterns and factors driving diversity gradients in microeukaryote communities (total, abundant,...

Université de Neuchâtel

Parasites dominate hyperdiverse soil protist communities in Neotropical rainforests

Mahé, Frédéric ; de Vargas, Colomban ; Bass, David ; Czech, Lucas ; Stamatakis, Alexandros ; Lara, Enrique ; Singer, David ; Mayor, Jordan ; Bunge, John ; Sernaker, Sarah ; Siemensmeyer, Tobias ; Trautmann, Isabelle ; Romac, Sarah ; Berney, Cédric ; Kozlov, Alexey ; Mitchell, Edward A. D ; Seppey, Christophe V. W ; Egge, Elianne ; Lentendu, Guillaume ; Wirth, Rainer ; Trueba, Gabriel ; Dunthorn, Micah

In: NATURE ECOLOGY & EVOLUTION, 2017, vol. 1, no. art no 0091, p. 1-8

High animal and plant richness in tropical rainforest communities has long intrigued naturalists. It is unknown if similar hyperdiversity patterns are reflected at the microbial scale with unicellular eukaryotes (protists). Here we show, using environmental metabarcoding of soil samples and a phylogeny-aware cleaning step, that protist communities in Neotropical rainforests are hyperdiverse and...

Accès public à partir du 31 mai 2018
Université de Neuchâtel

A contribution to the phylogeny of agglutinating Arcellinida (Amoebozoa) based on SSU rRNA gene sequences

Gomaa, Fatma ; Lahr, Daniel J. G ; Todorov, Milcho ; Li, Jingchun ; Lara, Enrique

In: European Journal of Protistology, 2017, vol. 59, p. 99-107

Arcellinid testate amoebae include a wide variety of amoeboid organisms whose test (shell) varies in shape, composition and size. A decade ago, we initiated molecular phylogenetic analyses based on SSU rRNA gene sequences and a taxonomic revision of Arcellinida. However, many lineages within Arcellinida still lack molecular data, and the phylogeny of this group is largely incomplete. In this...

Accès public à partir du 1 avr. 2018
Université de Neuchâtel

NAD9/NAD7 (mitochondrial nicotinamide adenine dinucleotide dehydrogenase gene) : A new “Holy Grail” phylogenetic and DNA-barcoding marker for Arcellinida (Amoebozoa)?

Blandenier, Quentin ; Lara, Enrique ; Mitchell, Edward A.D ; Alcantara, Daniel M.C ; Siemensma, Ferry J ; Todorov, Milcho ; Lahr, Daniel J.G

In: European Journal of Protistology, 2017, vol. 58, p. 175-186

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...

Accès public à partir du 1 avr. 2018
Université de Neuchâtel

Soil protistology rebooted : 30 fundamental questions to start with

Geisen, Stefan ; Mitchell, Edward A.D ; Wilkinson, David M ; Adl, Sina ; Bonkowski, Michael ; Brown, Matthew W ; Fiore-Donno, Anna Maria ; Heger, Thierry J ; Jassey, Vincent E.J ; Krashevska, Valentyna ; Lahr, Daniel J.G ; Marcisz, Katarzyna ; Mulot, Matthieu ; Payne, Richard ; Singer, David ; Anderson, Roger O ; Charman, Dan J ; Ekelund, Flemming ; Griffiths, Bryan S ; Rønn, Regin ; Smirnov, Alexey ; Bass, David ; Belbahri, Lassaâd ; Berney, Cédric ; Blandenier, Quentin ; Chatzinotas, Antonis ; Clarholm, Marianne ; Dunthorn, Micah ; Feest, Alan ; Fernández, Leonardo D ; Foissner, Wilhelm ; Fournier, Bertrand ; Gentekaki, Eleni ; Hájek, Michal ; Helder, Johannes ; Jousset, Alexandre ; Koller, Robert ; Kumar, Santosh ; La Terza, Antonietta ; Lamentowicz, Mariusz ; Mazei, Yuri ; Santos, Susana S ; Seppey, Christophe V.W ; Spiegel, Frederick W ; Walochnik, Julia ; Winding, Anne ; Lara, Enrique

In: Soil Biology & Biochemistry, 2017, vol. 111, no. 94-103, p. 2017

Protists are the most diverse eukaryotes. These microbes are keystone organisms of soil ecosystems and regulate essential processes of soil fertility such as nutrient cycling and plant growth. Despite this, protists have received little scientific attention, especially compared to bacteria, fungi and nematodes in soil studies. Recent methodological advances, particularly in molecular biology...

Accès public à partir du 15 août 2018
Université de Neuchâtel

Mycamoeba gemmipara nov. gen., nov. sp., the First Cultured Member of the Environmental Dermamoebidae Clade LKM74 and its Unusual Life Cycle

Blandenier, Quentin ; Seppey, Christophe V. W ; Singer, David ; Vlimant, Michèle ; Simon, Anaële ; Duckert, Clément ; Lara, Enrique

In: Journal of Eukaryotic Microbiology, 2017, vol. 64, no. 2, p. 257-265

Since the first environmental DNA surveys, entire groups of sequences called “environmental clades” did not have any cultured representative. LKM74 is an amoebozoan clade affiliated to Dermamoebidae, whose presence is pervasively reported in soil and freshwater. We obtained an isolate from soil that we assigned to LKM74 by molecular phylogeny, close related to freshwater clones. We described...