{"id":26007,"date":"2017-08-02T00:52:56","date_gmt":"2017-08-01T22:52:56","guid":{"rendered":"http:\/\/almowatna.news\/?p=26007"},"modified":"2017-08-02T00:52:56","modified_gmt":"2017-08-01T22:52:56","slug":"la-contribution-des-insecticides-neonicotinoides-au-declin-des-abeilles-est-confirmee","status":"publish","type":"post","link":"http:\/\/almowatna.news\/?p=26007","title":{"rendered":"La contribution des insecticides n\u00e9onicotino\u00efdes au d\u00e9clin des abeilles est confirm\u00e9e"},"content":{"rendered":"<p>Les insecticides n\u00e9onicotino\u00efdes ont d\u00e9j\u00e0 \u00e9t\u00e9 point\u00e9s du doigt \u00e0 de nombreuses reprises concernant le d\u00e9clin des abeilles. Deux nouvelles \u00e9tudes, parues en juin dans la revue\u00a0<em>Science<\/em>, enfoncent un peu plus le clou. Elles confirment l\u2019impact n\u00e9gatif qu\u2019ont ces pesticides sur la survie des abeilles. Les \u00e9tudes, r\u00e9alis\u00e9es \u00e0 l\u2019\u00e9chelle de la colonie et non plus \u00e0 celle de l\u2019abeille, ont aussi \u00e9t\u00e9 men\u00e9es sur le long terme et en milieu naturel. Elles \u00e9chappent ainsi au reproche souvent fait aux \u00e9tudes pr\u00e9c\u00e9dentes d\u2019utiliser des doses de n\u00e9onicotino\u00efdes sup\u00e9rieures \u00e0 celles auxquelles les abeilles sont expos\u00e9es dans l\u2019environnement.<\/p>\n<p>La<a href=\"http:\/\/science.sciencemag.org\/content\/356\/6345\/1395\" target=\"_blank\" rel=\"noopener\">\u00a0premi\u00e8re \u00e9tude<\/a>, men\u00e9e au Canada par Nadejda Tsvetkov, de l\u2019universit\u00e9 York \u00e0 Toronto, et ses coll\u00e8gues, met en \u00e9vidence la contamination de la flore sauvage par les n\u00e9onicotino\u00efdes et le fait que les abeilles sont expos\u00e9es \u00e0 ces substances pendant la quasi totalit\u00e9 de leur p\u00e9riode d\u2019activit\u00e9. L\u2019exposition des abeilles aux n\u00e9onicotino\u00efdes entra\u00eene une diminution de leur capacit\u00e9 \u00e0 \u00e9lever des reines, sans lesquelles les colonies ne peuvent survivre. Les ouvri\u00e8res expos\u00e9es aux n\u00e9onicotino\u00efdes au stade larvaire voient leur esp\u00e9rance de vie r\u00e9duite de 23% par rapport \u00e0 celle des ouvri\u00e8res qui n\u2019y sont pas expos\u00e9es. Autre r\u00e9sultat int\u00e9ressant, la toxicit\u00e9 de certains n\u00e9onicotino\u00efdes est presque doubl\u00e9e en pr\u00e9sence d\u2019un fongicide couramment utilis\u00e9.<\/p>\n<p>Sous la direction de Ben Woodcock, du Centre for Ecology &amp; Hydrology \u00e0 Wallingford, au Royaume-Uni,\u00a0<a href=\"http:\/\/science.sciencemag.org\/content\/356\/6345\/1393\" target=\"_blank\" rel=\"noopener\">les auteurs de la seconde \u00e9tude<\/a>\u00a0se sont int\u00e9ress\u00e9s \u00e0 l\u2019\u00e9volution d\u00e9mographique des colonies d\u2019abeilles durant l\u2019ann\u00e9e qui suivait leur exposition aux n\u00e9onicotino\u00efdes, sur des sites naturels r\u00e9partis dans trois pays (Hongrie, Royaume-Uni et Allemagne). Les r\u00e9sultats diff\u00e8rent selon les pays, car les effets des insecticides sur les abeilles d\u00e9pendent de nombreux facteurs. Cependant, en Hongrie par exemple, apr\u00e8s la p\u00e9riode hivernale suivant l\u2019exposition aux n\u00e9onicotino\u00efdes, le nombre d\u2019abeilles domestiques ouvri\u00e8res sur les sites o\u00f9 les cultures ont \u00e9t\u00e9 trait\u00e9es avec ces insecticides \u00e9tait inf\u00e9rieur de 24% \u00e0 celui des sites non trait\u00e9s.<\/p>\n<p>Fait notable, cette seconde \u00e9tude a \u00e9t\u00e9 financ\u00e9e par deux fabricants de n\u00e9onicotino\u00efdes, Syngenta et Bayer CropScience. Pour Axel Decourtye, directeur scientifique et technique de l\u2019Institut de l\u2019abeille \u00e0 Avignon, \u00ab\u00a0<em>l\u2019implication des n\u00e9onicotino\u00efdes dans le d\u00e9clin des abeilles est reconnue par la plupart des scientifiques, mais jusqu\u2019ici les entreprises qui les commercialisent l\u2019ont toujours contest\u00e9. Il faut esp\u00e9rer que la confirmation de ce constat par ces parties prenantes sera l\u2019\u00e9pilogue d\u2019une controverse qui dure depuis vingt ans\u00a0<\/em>\u00bb.<\/p>\n<p>DEPLACE DU RECHERCHE<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les insecticides n\u00e9onicotino\u00efdes ont d\u00e9j\u00e0 \u00e9t\u00e9 point\u00e9s du doigt \u00e0 de nombreuses reprises concernant le d\u00e9clin des abeilles. Deux nouvelles \u00e9tudes, parues en juin dans la revue\u00a0Science, enfoncent un peu plus le clou. Elles confirment l\u2019impact n\u00e9gatif qu\u2019ont ces pesticides sur la survie des abeilles. Les \u00e9tudes, r\u00e9alis\u00e9es \u00e0 l\u2019\u00e9chelle de la colonie et non [&hellip;]<\/p>\n","protected":false},"author":48,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13400],"tags":[16416,16417],"class_list":["post-26007","post","type-post","status-publish","format-standard","hentry","category-section-francaise","tag-insecticides","tag-recherche"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>La contribution des insecticides n\u00e9onicotino\u00efdes au d\u00e9clin des abeilles est confirm\u00e9e | \u0627\u0644\u0645\u0648\u0627\u0637\u0646\u0629 \u0646\u064a\u0648\u0632<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/almowatna.news\/?p=26007\" \/>\n<meta property=\"og:locale\" content=\"ar_AR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La contribution des insecticides n\u00e9onicotino\u00efdes au d\u00e9clin des abeilles est confirm\u00e9e | \u0627\u0644\u0645\u0648\u0627\u0637\u0646\u0629 \u0646\u064a\u0648\u0632\" \/>\n<meta property=\"og:description\" content=\"Les insecticides n\u00e9onicotino\u00efdes ont d\u00e9j\u00e0 \u00e9t\u00e9 point\u00e9s du doigt \u00e0 de nombreuses reprises concernant le d\u00e9clin des abeilles. Deux nouvelles \u00e9tudes, parues en juin dans la revue\u00a0Science, enfoncent un peu plus le clou. Elles confirment l\u2019impact n\u00e9gatif qu\u2019ont ces pesticides sur la survie des abeilles. 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