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Neonicotinoids are the most widely used insecticides in the world . They are applied to a broad range of food, energy, and ornamental crops, and used in domestic pest control. Because they are neorotoxins, they are higyly toxic to insects , a group of organisms that contains the majority of the described life on Earth, and wich includes numerous species of vital importance to humans such as pollinators and predators of pets... Fil: Frey, Hans. Geothermal Electricity Generation; Australia Fil: Tzinieris, Sarah. King's College; Reino Unido Fil: Colin, Marc Edouard. Universidad de Aix-Marsella; Francia Fil: Marchand, Patrice. Centre National de la Recherche Scientifique; Francia Fil: Bastian, Suzanne. University of Brittany-Loire; Francia Fil: Richard, Freddie Jeanne. Université de Poitiers; Francia Fil: Early, Ralph. Harper Adams University; Reino Unido Fil: Herrick, Sarah. University of Manchester; Reino Unido Fil: Arlettaz, Raphaël. University of Bern; Suiza Fil: Wubs, E.R.J.. 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Environmental DNA surveys are used for screening eukaryotic diversity. However, it is unclear how quantitative this approach is and to what extent results from environmental DNA studies can be used for ecological studies requiring quantitative data. Mitochondrial cytochrome oxidase (COI) is used for species-level taxonomic studies of testate amoebae and should allow assessing the community composition from environmental samples, thus bypassing biases due to morphological identification. We tested this using a COI clone library approach and focusing on the Nebela collaris complex. Comparisons with direct microscopy counts showed that the COI clone library diversity data matched the morphologically identified taxa, and that community com-position estimates using the two approaches were similar. However, this correlation was improved when microscopy counts were corrected for biovolume. Higher correlation with biovolume-corrected community data suggests that COI clone library data matches the ratio of mitochondria and that within closely-related taxa the density of mitochondria per unit biovolume is approximately constant. Further developments of this metabarcoding approach including quantifying the mitochondrial density among closely-related taxa, experiments on other taxonomic groups and using high throughput sequencing should make if possible to quantitatively estimate community composition of different groups, which would be invaluable for microbial food webs studies.

L’analyse de quelques échantillons de mousses poussant sur le mur d'enceinte du château de Neuchâtel a révélé la présence de 23 taxons de thécamoebiens : dont 10 Euglyphides et 13 Arcellinides sur un total de 117 espèces recensées au total, tous groupes taxonomiques confondus. Ce total de 23 taxons est sans doute une sous-estimation compte-tenu des découvertes récentes d’une diversité inconnue d’espèces et taxons de rangs supérieurs au sein des différents groupes de protistes, y compris chez les thécamoebiens. Ces résultats illustrent le potentiel de découverte d’une diversité méconnue dans le monde microbien, même dans des régions où la diversité des organismes vivants a été bien étudiée depuis des siècles. The analysis of a few moss samples collected on the walls of the castle of Neuchâtel has revealed the presence of 23 taxa of testate amoebae, among which 10 Euglyphids and 13 Arcellinids, out of an overall total of 117 observed taxa, for all taxonomic groups. As hitherto unknown species and higher taxa are continuously being discovered within the various groups of protists including testate amoebae, this total of 23 taxa is most likely an underestimation. These results illustrate the potential for discovery of a poorly known diversity within the microbial world, including in regions where the diversity of living organisms has been well studied for centuries.

Assessing the degree to which climate explains the spatial distributions of different taxonomic and functional groups is essential for anticipating the effects of climate change on ecosystems. Most effort so far has focused on above-ground organisms, which offer only a partial view on the response of biodiversity to environmental gradients. Here including both above- and below-ground organisms, we quantified the degree of topoclimatic control on the occurrence patterns of >1,500 taxa and phylotypes along a c. 3,000 m elevation gradient, by fitting species distribution models. Higher model performances for animals and plants than for soil microbes (fungi, bacteria and protists) suggest that the direct influence of topoclimate is stronger on above-ground species than on below-ground microorganisms. Accordingly, direct climate change effects are predicted to be stronger for above-ground than for below-ground taxa, whereas factors expressing local soil microclimate and geochemistry are likely more important to explain and forecast the occurrence patterns of soil microbiota. Detailed mapping and future scenarios of soil microclimate and microhabitats, together with comparative studies of interacting and ecologically dependent above- and below-ground biota, are thus needed to understand and realistically forecast the future distribution of ecosystems., Global Change Biology, 26 (12), ISSN:1354-1013, ISSN:1365-2486

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 techniques, have made the study of soil protists more accessible, and have created a resurgence of interest in soil protistology. This ongoing revolution now enables comprehensive investigations of the structure and functioning of soil protist communities, paving the way to a new era in soil biology. Instead of providing an exhaustive review, we provide a synthesis of research gaps that should be prioritized in future studies of soil protistology to guide this rapidly developing research area. Based on a synthesis of expert opinion we propose 30 key questions covering a broad range of topics including evolution, phylogenetics, functional ecology, macroecology, paleoecology, and methodologies. These questions highlight a diversity of topics that will establish soil protistology as a hub discipline connecting different fundamental and applied fields such as ecology, biogeography, evolution, plant-microbe interactions, agronomy, and conservation biology. We are convinced that soil protistology has the potential to be one of the most exciting frontiers in biology.