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Accès public à partir du 1 avr. 2019
Université de Neuchâtel

Palaeoecology of Sphagnum riparium (Ångström) in Northern Hemisphere peatlands : Implications for peatland conservation and palaeoecological research

Gałka, Mariusz ; Galloway, Jennifer M ; Lemonis, Natalie ; Mazei, Yuri A ; Mitchell, Edward A.D ; Morse, Peter D ; Patterson, Timothy R ; Tsyganov, Andrey N ; Wolfe, Stephen A ; Swindles, Graeme T

In: Review of Palaeobotany and Palynology, 2018, vol. 254, p. 1-7

Sphagnum riparium (Ångström) is a rare constituent of modern peatland plant communities and is also very rarely found as a subfossil in peat archives. We present new data on the occurrence of Sphagnum riparium macrofossils in three Northern Hemisphere peatlands from Yellowknife (NWCanada), Abisko (N Sweden), and the Northern Ural Mountains (NWRussia). Sphagnum riparium...

Université de Neuchâtel

Impact of two hot and dry summers on the community structure and functional diversity of testate amoebae in an artificial bog, illustrating their use as bioindicators of peatland health

Koenig, Isabelle ; Christinat, K ; d’Inverno, Mirko ; Mitchell, Edward A.D

In: Mires and Peat, 2018, vol. 21, p. 1-24

Ongoing climate warming threatens the survival of bogs at the warm/dry limit of their distribution (e.g. in central Europe), and jeopardises the restoration of damaged bogs even more. Because vegetation changes can be slow, early indicators of hydrological change such as testate amoebae are useful. We used testate amoeba community structure and community weighted mean of functional traits...

Université de Neuchâtel

Response of Sphagnum Testate Amoebae to Drainage, Subsequent Re-wetting and Associated Changes in the Moss Carpet : Results from a Three Year Mesocosm Experiment

Koenig, Isabelle ; Schwendener, Florence ; Mulot, Matthieu ; Mitchell, Edward A.D

In: Acta Protozoologica, 2017, vol. 56, no. 3, p. 191-210

Sphagnum peatlands represent a globally significant pool and sink of carbon but these functions are threatened by ongoing climate change. Testate amoebae are useful bioindicators of hydrological changes, but little experimental work has been done on the impact of water table changes on communities. Using a mesocosm experimental setting that was previously used to assess the impact of...

Accès public à partir du 1 mars 2019
Université de Neuchâtel

Development of a new ecotoxicological assay using the testate amoeba Euglypha rotunda (Rhizaria; Euglyphida) and assessment of the impact of the herbicide S-metolachlor

Amacker, Nathalie ; Mitchell, Edward A.D ; Ferrari, Benoît J. D ; Chèvre, Nathalie

In: Chemosphere, 2018, vol. 201, p. 351-360

An ever-increasing diversity of potentially toxic chemical compounds are being developed and released into the environment as a result of human activities (e.g. agriculture, drugs, and cosmetics). Among these, pesticides have been shown to affect non-targeted wildlife since the 1960s. A range of ecotoxicological tests are used to assess the toxicity of pesticides on various model organisms....

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

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...

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...

Université de Neuchâtel

To What Extent Do Food Preferences Explain the Trophic Position of Heterotrophic and Mixotrophic Microbial Consumers in a Sphagnum Peatland?

Jassey, Vincent E. J ; Meyer, Caroline ; Dupuy, Christine ; Bernard, Nadine ; Mitchell, Edward A.D ; Toussaint, Marie-Laure ; Metian, Marc ; Chatelain, Auriel P ; Gilbert, Daniel

In: Microbial ecology, 2013, vol. 66, no. 3, p. 571–580

Although microorganisms are the primary drivers of biogeochemical cycles, the structure and functioning of microbial food webs are poorly studied. This is the case in Sphagnum peatlands, where microbial communities play a key role in the global carbon cycle. Here, we explored the structure of the microbial food web from a Sphagnum peatland by analysing (1) the density and biomass of...

Université de Neuchâtel

Checklist, diversity and distribution of testate amoebae in Chile

Fernández, Leonardo D ; Lara, Enrique ; Mitchell, Edward A.D

In: European Journal of Protistology, 2015, vol. 51, no. 5, p. 409-424

Bringing together more than 170 years of data, this study represents the first attempt to construct a species checklist and analyze the diversity and distribution of testate amoebae in Chile, a country that encompasses the southwestern region of South America, countless islands and part of the Antarctic. In Chile, known diversity includes 416 testate amoeba taxa (64 genera, 352 infrageneric...

Université de Neuchâtel

The Phanerozoic diversification of silica-cycling testate amoebae and its possible links to changes in terrestrial ecosystems

Lahr, Daniel J.G ; Bosak, Tanja ; Lara, Enrique ; Mitchell, Edward A.D

In: PeerJ, 2015, vol. 3:e1234, p. 1-19

The terrestrial cycling of Si is thought to have a large influence on the terrestrial and marine primary production, as well as the coupled biogeochemical cycles of Si and C. Biomineralization of silica is widespread among terrestrial eukaryotes such as plants, soil diatoms, freshwater sponges, silicifying flagellates and testate amoebae. Two major groups of testate (shelled) amoebae, arcellinids...