{"id":10001,"date":"2017-04-04T09:30:39","date_gmt":"2017-04-04T07:30:39","guid":{"rendered":"https:\/\/www.umweltperspektiven.ch\/?p=918"},"modified":"2022-02-09T11:10:56","modified_gmt":"2022-02-09T10:10:56","slug":"baeche-sind-zu-stark-pestizidbelastet","status":"publish","type":"post","link":"https:\/\/www.organisator.ch\/fr\/sustainability\/2017-04-04\/baeche-sind-zu-stark-pestizidbelastet\/","title":{"rendered":"Les ruisseaux sont trop charg\u00e9s en pesticides"},"content":{"rendered":"<figure id=\"attachment_919\" aria-describedby=\"caption-attachment-919\" style=\"width: 680px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-919\" src=\"\/\/www.umweltperspektiven.ch\/wp-content\/uploads\/2017\/04\/Depositphotos_117398074_xl-2015.jpg\" alt=\"\" width=\"680\" height=\"505\" \/><figcaption id=\"caption-attachment-919\" class=\"wp-caption-text\">L'idylle est trompeuse : ce sont justement les petits ruisseaux qui sont particuli\u00e8rement souvent pollu\u00e9s.<\/figcaption><\/figure>\n<p>45'000 kilom\u00e8tres, soit les trois quarts du r\u00e9seau hydrographique suisse, sont consid\u00e9r\u00e9s comme des petits ruisseaux et des ruisselets. Jusqu'\u00e0 pr\u00e9sent, il n'existe cependant pas de stations de mesure qui y surveillent la qualit\u00e9 de l'eau sur de longues p\u00e9riodes. La valeur informative des \u00e9chantillons est limit\u00e9e. Sur mandat de l'Office f\u00e9d\u00e9ral de l'environnement (OFEV), l'Eawag et le Centre Ecotox Eawag-EPFL ont donc examin\u00e9 de plus pr\u00e8s cinq cours d'eau en collaboration avec cinq cantons (TG, BL, BE, VS, TI) et l'Association suisse des professionnels de la protection des eaux (VSA). Leurs bassins versants sont typiques d'une forte exploitation agricole. De mars \u00e0 ao\u00fbt 2015, pr\u00e8s de 1800 \u00e9chantillons d'eau ont \u00e9t\u00e9 collect\u00e9s. Aujourd'hui, les participants ont publi\u00e9 les \u00e9valuations dans deux articles sp\u00e9cialis\u00e9s de la revue Aqua&amp;Gas. (<a href=\"\/\/www.newsd.admin.ch\/newsd\/message\/attachments\/47760.pdf\">Ici <\/a>et <a href=\"\/\/www.newsd.admin.ch\/newsd\/message\/attachments\/47761.pdf\">ici<\/a>)<\/p>\n<p><b>Une multitude de substances actives et des concentrations \u00e9lev\u00e9es<\/b><\/p>\n<p>Les soup\u00e7ons selon lesquels les petits cours d'eau sont fortement contamin\u00e9s par des produits phytosanitaires (PPP) se sont confirm\u00e9s. Le nombre de substances est tr\u00e8s \u00e9lev\u00e9 : les chercheurs ont d\u00e9tect\u00e9 128 substances actives diff\u00e9rentes issues des grandes cultures, des cultures mara\u00eech\u00e8res, des cultures fruiti\u00e8res et de la vigne dans les \u00e9chantillons, 61 herbicides, 45 fongicides et 22 insecticides. Dans 80% des \u00e9chantillons, l'exigence de l'ordonnance sur la protection des eaux (\u22640,1 \u00b5g\/L) d'au moins une substance n'a pas \u00e9t\u00e9 respect\u00e9e - dans les cinq ruisseaux \u00e9tudi\u00e9s pendant plus de 60 jours, dans le Weierbach (BL) et l'Eschelisbach (TG) pratiquement pendant toute la dur\u00e9e de l'\u00e9tude de six mois. Des concentrations de certaines substances allant jusqu'\u00e0 40 \u00b5g\/L ont \u00e9t\u00e9 constat\u00e9es. Les pics de courte dur\u00e9e sont probablement encore plus \u00e9lev\u00e9s, car tous les \u00e9chantillons ont \u00e9t\u00e9 moyenn\u00e9s sur au moins une demi-journ\u00e9e.<\/p>\n<p><b>M\u00e9langes \u00e0 toxicit\u00e9 chronique et aigu\u00eb<\/b><\/p>\n<p>Comme la valeur maximale de 0,1 \u00b5g\/L par substance individuelle dans l'ordonnance sur la protection des eaux n'en dit pas assez sur le v\u00e9ritable risque pour les organismes, les chercheurs ont \u00e9galement compar\u00e9 les donn\u00e9es d'analyse avec des crit\u00e8res de qualit\u00e9 \u00e9cotoxicologiques. En outre, des biotests ont \u00e9t\u00e9 r\u00e9alis\u00e9s avec des algues et des \u00e9crevisses de rivi\u00e8re et la diversit\u00e9 des invert\u00e9br\u00e9s a \u00e9t\u00e9 \u00e9tudi\u00e9e. En effet, en moyenne, ce n'est pas une, mais 20 \u00e0 40 substances qui ont \u00e9t\u00e9 trouv\u00e9es dans chaque \u00e9chantillon. Les r\u00e9sultats laissent peu de place \u00e0 l'interpr\u00e9tation : dans tous les cours d'eau, les crit\u00e8res de qualit\u00e9 relatifs \u00e0 l'\u00e9cotoxicit\u00e9 chronique ont \u00e9t\u00e9 d\u00e9pass\u00e9s, parfois de plusieurs fois, au minimum pendant deux semaines (TI), au maximum jusqu'\u00e0 cinq mois et demi (BL, TG). Dans quatre cours d'eau, m\u00eame les concentrations \u00e0 partir desquelles le m\u00e9lange de pesticides pr\u00e9sente un risque de toxicit\u00e9 aigu\u00eb pour les organismes sensibles ont \u00e9t\u00e9 d\u00e9pass\u00e9es, au maximum pendant deux mois (VS). Les \u00e9crevisses l\u00e2ch\u00e9es dans l'un des ruisseaux ont montr\u00e9 des taux de mortalit\u00e9 plus \u00e9lev\u00e9s et un comportement l\u00e9thargique, associ\u00e9s \u00e0 des concentrations \u00e9lev\u00e9es de pesticides. L'\u00e9valuation a donn\u00e9 des notes insatisfaisantes et mauvaises sur tous les sites. La pollution la plus faible a \u00e9t\u00e9 constat\u00e9e dans la station de mesure tessinoise, car le bassin versant concern\u00e9 pr\u00e9sente une intensit\u00e9 d'exploitation agricole moindre en comparaison. Marion Junghans du Centre Ecotox r\u00e9sume : \"Le m\u00e9lange sans cesse changeant de nombreuses substances \u00e0 des concentrations probl\u00e9matiques et les risques \u00e9lev\u00e9s persistants ne laissent dans de nombreux cas aucun temps de r\u00e9cup\u00e9ration aux organismes\".<\/p>\n<p><b>Plan d'action pour la r\u00e9duction des risques li\u00e9s aux produits phytosanitaires en cours d'\u00e9laboration<\/b><\/p>\n<p>Pour Stephan M\u00fcller, chef de la division Eau de l'OFEV, les r\u00e9sultats confirment que les PPS issus de l'agriculture sont - avec les micropolluants qui parviennent dans les eaux via les stations d'\u00e9puration - les plus importantes pollutions mat\u00e9rielles actuelles des eaux de surface suisses. C'est surtout le cas dans les petits ruisseaux, qui pr\u00e9sentent un int\u00e9r\u00eat particulier car ils constituent des refuges et des \"nurseries\" pour les organismes aquatiques, notamment les poissons.<\/p>\n<p>Les mesures techniques r\u00e9cemment adopt\u00e9es par le Parlement permettent de r\u00e9duire de moiti\u00e9 la part de micropolluants produite par les stations d'\u00e9puration. Selon M\u00fcller, il faut maintenant r\u00e9duire sensiblement la contamination par les PPS. Le plan d'action sur les PPP, \u00e9labor\u00e9 sous l'\u00e9gide de l'Office f\u00e9d\u00e9ral de l'agriculture et dans lequel la protection des eaux est un th\u00e8me prioritaire, constitue un pas important dans cette direction. En outre, les utilisateurs sont appel\u00e9s \u00e0 manipuler ces poisons environnementaux avec pr\u00e9caution et \u00e0 les utiliser le moins possible.<\/p>\n<p>texte : OFEV<\/p>","protected":false},"excerpt":{"rendered":"<p>45\u2018000 Kilometer, drei Viertel des Schweizer Gew\u00e4ssernetzes, gelten als kleine B\u00e4che und B\u00e4chlein. Bisher gibt es jedoch keine Messstellen, welche dort die Wasserqualit\u00e4t \u00fcber l\u00e4ngere Zeitr\u00e4ume \u00fcberwachen. Die Aussagekraft von Stichproben ist begrenzt. Im Auftrag des Bundesamtes f\u00fcr Umwelt (BAFU) haben daher die Eawag und das Oekotoxzentrum Eawag-EPFL zusammen mit f\u00fcnf Kantonen (TG, BL, BE, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9484,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"Fliessgew\u00e4sser","_yoast_wpseo_metadesc":"Kleine Fliessgew\u00e4sser sind mit einer Vielzahl von Herbiziden, Fungiziden und Insektiziden belastet. Dies zeigt eine im Auftrag des BAFU erstellte Studie.","articlekey":"","footnotes":""},"categories":[580],"tags":[762,1195,1893,459,460,2523],"class_list":["post-10001","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sustainability","tag-bafu","tag-fliessgewaesser","tag-pestizidde","tag-studie","tag-studien","tag-wasserqualitaet"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>B\u00e4che sind zu stark pestizidbelastet - Organisator<\/title>\n<meta name=\"description\" content=\"Kleine Fliessgew\u00e4sser sind mit einer Vielzahl von Herbiziden, Fungiziden und Insektiziden belastet. 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