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Aebi, Alexandre
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Aebi, Alexandre
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MER
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alexandre.aebi@unine.ch
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Voici les éléments 1 - 10 sur 67
- PublicationAccès libre
- PublicationAccès libreLes pesticides: lacunes et alternatives(2020-2-9)
; Les études de l’impact des néonicotinoïdes sur les abeilles ont permis une prise de conscience sur la toxicité de ces molécules. Mais ces insectes ne sont pas les seuls à subir les conséquences de l’usage massif des pesticides en agriculture conventionnelle. En nous focalisant sur l’abeille, ne risque-t-on pas de négliger les effets sur les autres organismes vivants? - PublicationAccès libreColEval: Honeybee COLony Structure EVALuation for Field Surveys(2020-1-5)
; ; Kretzschmar, AndréMethods for the evaluation and comparison of the structure of numerous honeybee colonies are needed for the development of applied and fundamental field research, as well as to evaluate how the structure and activity of honeybee colonies evolve over time. ColEval complements existing methods, as it uses an online reference image bank for (human) learning and training purposes. ColEval is based on the evaluation of the surface area percentage occupied by different components of a honeybee colony: adult worker bees, open and capped brood, honey, nectar, and pollen. This method is an essential tool for the description of the evolution in the size of honeybee colonies. The procedure makes allowances for tendencies between different observers and uses them to calculate accurate measurements of honeybee colony evaluation. ColEval thus allows for a posteriori comparison of under- or over-evaluation made by different observers working on the same project; it is thus possible to eliminate observer bias in the measurements and to conduct large surveys. - PublicationAccès libreAgriculteurs, apiculteurs et chercheurs unis pour la sauvegarde des pollinisateurs(2019-11-1)
; ; ; Varennes, Yann-David - PublicationAccès libreUltra-trace level determination of neonicotinoids in honey as a tool for assessing environmental contamination(2019-2-5)
; ; Glauser, GaetanNeonicotinoids and the closely related insecticide classes sulfoximines and butenolides have recently attracted growing concerns regarding their potential negative effects on non-target organisms, including pollinators such as bees. Indeed, it is becoming increasingly clear that these effects may occur at much lower levels than those considered to be safe for humans. To properly assess the ecological and environmental risks posed by neonicotinoids, appropriate sampling and analytical procedures are needed. Here, we used honey as reliable environmental sampler and developed an unprecedentedly sensitive method based on QuEChERS and UHPLC-MS/MS for the simultaneous determination of the nine neonicotinoids and related molecules currently present on the market (acetamiprid, clothianidin, dinotefuran, flupyradifurone, imidacloprid, nitenpyram, sulfoxaflor, thiacloprid and thiamethoxam). The method was validated and provided excellent levels of precision and accuracy over a wide concentration range of 3–4 orders of magnitude. Lowest limits of quantification (LLOQs) as low as 2–20 pg/g of honey depending on the analytes were reached. The method was then applied to the analysis of 36 honey samples from various regions of the World which had already been analysed for the five most common neonicotinoids (acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam) in a previous study. This allowed us to determine the long-term stability (i.e. up to 40 months) of these molecules in honey, both at room temperature and −20 °C. We found that the five pesticides were stable over a period of several years at −20 °C, but that acetamiprid and thiacloprid partially degraded at room temperature. Finally, we also measured the levels of dinotefuran, nitenpyram, sulfoxaflor and flupyradifurone and found that 28% of the samples were contaminated by at least one of these pesticides. - PublicationAccès libreEclairage: «Pesticides: et les compétences locales?»(2019-1-21)Des universitaires nous éclairent sur des sujets d’actualité, de société, ou de recherche. Aujourd’hui, Alexandre Aebi de l’Université de Neuchâtel évoque l’interdiction des pesticides dans le canton de Neuchâtel.
- PublicationAccès libreUnderstanding negative biodiversity–ecosystem functioning relationship in semi-natural wildflower strips(2018-12-7)
; - PublicationAccès librePesticides: Berne doit jouer la transparence(2018-11-25)
; OPINION. Deux chercheurs de l’Université de Neuchâtel, Alexandre Aebi et Edward Mitchell, demandent à l’Office fédéral de l’agriculture de publier les informations détaillées sur l’usage des pesticides en Suisse, après une première communication insatisfaisante - PublicationAccès libreComment promouvoir une agriculture qui protège et profite de la biodiversité?(2018-11-1)
; - PublicationAccès libreThe parasitoid complex of D. suzukii and other fruit feeding Drosophila species in Asia(2018-6-27)
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