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Université de Neuchâtel

Testate Amoebae Like It Hot : Species Richness Decreases Along a Subalpine-Alpine Altitudinal Gradient in Both Natural Calluna vulgaris Litter and Transplanted Minuartia sedoides Cushions

Heger, Thierry J ; Derungs, Nicolas ; Theurillat, Jean-Paul ; Mitchell, Edward A. D

In: Microbial Ecology, 2016, vol. 71, no. 3, p. 725-734

Most groups of higher organisms show a decrease in species richness toward high altitude, but the existence of such a pattern is debated for micro-eukaryotes. Existing data are scarce and mostly confounded with the diversity of habitats that also decreases with elevation. In order to disentangle these two factors, one approach is to consider only similar types of habitats occurring across an...

Accès public à partir du 1 mars 2019
Université de Neuchâtel

Soil chemistry changes beneath decomposing cadavers over a one-year period

Szelecz, Ildikò ; Koenig, Isabelle ; Seppey, Christophe V. W ; Le Bayon, Renée-Claire ; Mitchell, Edward A. D

In: Forensic Science International, 2018, vol. 286, p. 155-165

Decomposing vertebrate cadavers release large, localized inputs of nutrients. These temporally limited resource patches affect nutrient cycling and soil organisms. The impact of decomposing cadavers on soil chemistry is relevant to soil biology, as a natural disturbance, and forensic science, to estimate the postmortem interval. However, cadaver impacts on soils are rarely studied, making it...

Université de Neuchâtel

Systemic insecticides (neonicotinoids and fipronil) : trends, uses, mode of action and metabolites

Simon-Delso, N ; Amaral-Rogers, V ; Belzunces, L. P ; Bonmatin, J. M ; Chagnon, Madeleine ; Downs, C. A ; Furlan, L ; Gibbons, D. W ; Giorio, C ; Girolami, V ; Goulson, D ; Kreutzweiser, David. P ; Krupke, C ; Liess, M ; Long, E ; McField, M ; Mineau, Pierre ; Mitchell, Edward A. D ; Morrissey, Christy A ; Noome Dominique A ; Pisa, L ; Settele, J ; Stark, J. D ; Tapparo, A ; Van Dyck, H ; van Praagh, J ; Van der Sluijs, Jeroen P ; Whitehorn, P. R ; Wiemers, M

In: Environmental Science and Pollution Research, 2015, vol. 22, no. 1, p. 5-34

Since their discovery in the late 1980s, neonicotinoid pesticides have become the most widely used class of insecticides worldwide, with large-scale applications ranging from plant protection (crops, vegetables, fruits), veterinary products, and biocides to invertebrate pest control in fish farming. In this review, we address the phenyl-pyrazole fipronil together with neonicotinoids because of...

Université de Neuchâtel

Discrepancies in Growth Measurement Methods of Mosses : An Example from Two Keystone Species Grown under Increased CO2 and N Supply in a Restored Peatland

Siegenthaler, Andy ; Buttler, Alexandre ; Grosvernier, Philippe ; Gobat, Jean-Michel ; Mitchell, Edward A. D

In: American Journal of Plant Sciences, 2014, vol. 5, no. 15, p. 2354-2371

Bryophytes dominate northern peatlands. Obtaining reliable measurements of moss-growth and how it may be affected by global changes are therefore important. Several methods have been used to measure moss-growth but it is unclear how comparable they are in different conditions and this uncertainty undermines comparisons among studies. In a field experiment we measured the growth and production of...

Université de Neuchâtel

Environmental fate and exposure; neonicotinoids and fipronil

Bonmatin, J. M ; Giorio, C ; Girolami, V ; Goulson, D ; Kreutzweiser, David. P ; Krupke, C ; Liess, M ; Long, E ; Marzaro, M ; Mitchell, Edward A. D ; Noome Dominique A ; Simon-Delso, N ; Tapparo, A

In: Environmental Science and Pollution Research, 2015, vol. 22, no. 1, p. 35-67

Systemic insecticides are applied to plants using a wide variety of methods, ranging from foliar sprays to seed treatments and soil drenches. Neonicotinoids and fipronil are among the most widely used pesticides in the world. Their popularity is largely due to their high toxicity to invertebrates, the ease and flexibility with which they can be applied, their long persistence, and their systemic...

Université de Neuchâtel

Risks of large-scale use of systemic insecticides to ecosystem functioning and services

Chagnon, Madeleine ; Kreutzweiser, David. P ; Mitchell, Edward A. D ; Morrissey, Christy A ; Noome Dominique A ; Van der Sluijs, Jeroen P

In: Environmental Science and Pollution Research, 2015, vol. 22, no. 1, p. 119-134

Large-scale use of the persistent and potent neonicotinoid and fipronil insecticides has raised concerns about risks to ecosystem functions provided by a wide range of species and environments affected by these insecticides. The concept of ecosystem services is widely used in decision making in the context of valuing the service potentials, benefits, and use values that well-functioning...

Université de Neuchâtel

A worldwide survey of neonicotinoids in honey

Mitchell, Edward A. D ; Mulhauser, Blaise ; Mulot, Matthieu ; Mutabazi, A ; Glauser, Gaëtan ; Aebi, Alexandre

In: Science, 2017, vol. 358, no. 6359, p. 109-111

Growing evidence for global pollinator decline is causing concern for biodiversity conservation and ecosystem services maintenance. Neonicotinoid pesticides have been identified or suspected as a key factor responsible for this decline. We assessed the global exposure of pollinators to neonicotinoids by analyzing 198 honey samples from across the world. We found at least one of five tested...

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...

Université de Neuchâtel

Effect of taxonomic resolution on ecological and palaeoecological inference : a test using testate amoeba water table depth transfer functions

Mitchell, Edward A. D ; Lamentowicz, Mariusz ; Payne, Richard J ; Mazei, Yuri

In: Quaternary Science Reviews, 2014, vol. 91, p. 62-69

Sound taxonomy is a major requirement for quantitative environmental reconstruction using biological data. Transfer function performance should theoretically be expected to decrease with reduced taxonomic resolution. However for many groups of organisms taxonomy is imperfect and species level identification not always possible. We conducted numerical experiments on five testate amoeba water table...