{"id":508,"date":"2016-09-07T16:08:52","date_gmt":"2016-09-07T14:08:52","guid":{"rendered":"https:\/\/dev.umweltperspektiven.ch\/?p=508"},"modified":"2022-02-09T11:10:56","modified_gmt":"2022-02-09T10:10:56","slug":"schweizer-seen-lueften-geheimnisse","status":"publish","type":"post","link":"https:\/\/www.organisator.ch\/fr\/sustainability\/2016-09-07\/schweizer-seen-lueften-geheimnisse\/","title":{"rendered":"Les lacs suisses d\u00e9voilent leurs secrets"},"content":{"rendered":"<figure id=\"attachment_509\" aria-describedby=\"caption-attachment-509\" style=\"width: 680px\" class=\"wp-caption alignnone\"><a href=\"\/\/dev.umweltperspektiven.ch\/wp-content\/uploads\/2016\/12\/Schweizer-Seen-l\u00fcften-Geheimnisse-umweltperspektiven.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-509\" src=\"\/\/dev.umweltperspektiven.ch\/wp-content\/uploads\/2016\/12\/Schweizer-Seen-l\u00fcften-Geheimnisse-umweltperspektiven.jpg\" alt=\"Pourtant, il n&#039;a pas disparu : Dans le lac de Constance, une recherche cibl\u00e9e a permis de red\u00e9couvrir plusieurs sp\u00e9cimens d&#039;omble chevalier d&#039;eau profonde (Salvelinus profundus), une esp\u00e8ce qui n&#039;est pr\u00e9sente que dans cette r\u00e9gion.\" width=\"680\" height=\"421\" \/><\/a><figcaption id=\"caption-attachment-509\" class=\"wp-caption-text\">Pourtant, il n'a pas disparu : Dans le lac de Constance, une recherche cibl\u00e9e a permis de red\u00e9couvrir plusieurs sp\u00e9cimens d'omble chevalier d'eau profonde (Salvelinus profundus), une esp\u00e8ce qui n'est pr\u00e9sente que dans cette r\u00e9gion.<\/figcaption><\/figure>\n<p>La recherche sur les lacs r\u00e9serve toujours de nouvelles surprises. Lors de la journ\u00e9e d'information de l'Institut de recherche sur l'eau (Eawag), des sp\u00e9cialistes ont pu s'informer sur les nouveaux r\u00e9sultats et les nouvelles tendances.<\/p>\n<p>Dans le cadre du \"Projet Lac\" de grande envergure, l'Eawag a \u00e9tudi\u00e9 de 2010 \u00e0 2015 la diversit\u00e9 des poissons dans les lacs proches des Alpes, en collaboration avec les cantons, l'Office f\u00e9d\u00e9ral de l'environnement, l'Universit\u00e9 de Berne et le Mus\u00e9e d'histoire naturelle de la Commune de Berne, ainsi que d'autres partenaires.<\/p>\n<p>Plus de 70 esp\u00e8ces de poissons ont ainsi pu \u00eatre identifi\u00e9es. Les cor\u00e9gones pr\u00e9dominent jusqu'aux plus grandes profondeurs, mais uniquement dans les lacs les plus propres. Les perches et les carpes dominent dans les lacs plus riches en nutriments, aujourd'hui ou par le pass\u00e9. De nombreuses esp\u00e8ces des grandes profondeurs, notamment les cor\u00e9gones et les ombles, ne sont pr\u00e9sentes que dans certains lacs, o\u00f9 elles sont apparues au cours de l'\u00e9volution, le plus souvent depuis la derni\u00e8re p\u00e9riode glaciaire, en s'adaptant aux habitats extr\u00eames. Dans la majeure partie des lacs, les anciennes esp\u00e8ces de poissons d'eau profonde ont toutefois disparu. Par exemple, dans le lac de Zoug, profond de 197 m\u00e8tres, il n'y a presque plus de poissons en dessous de 30 m\u00e8tres.<\/p>\n<p><strong>Pas encore \u00e9teints<\/strong><\/p>\n<p>Le \"Projet Lac\" a \u00e9galement apport\u00e9 de bonnes nouvelles : Dans le lac de Constance, une recherche cibl\u00e9e a permis de red\u00e9couvrir plusieurs sp\u00e9cimens d'omble chevalier d'eau profonde (Salvelinus profundus), une esp\u00e8ce qui ne vit que dans cette r\u00e9gion.  Cette esp\u00e8ce, encore fr\u00e9quemment p\u00each\u00e9e par les p\u00eacheurs du lac de Constance jusque dans les ann\u00e9es 1960, a \u00e9t\u00e9 d\u00e9clar\u00e9e \u00e9teinte par l'Union internationale pour la conservation de la nature (UICN) en 2008. L'omble chevalier des profondeurs se trouvait \u00e0 des profondeurs d'environ 80 m\u00e8tres et se nourrissait de vers tourbillonnants, de petits crustac\u00e9s et de coquillages. La taille de la population d'o\u00f9 proviennent les sp\u00e9cimens d\u00e9couverts devrait \u00eatre \u00e9tudi\u00e9e \u00e0 l'avenir.<\/p>\n<p><strong>Une fertilisation excessive il y a 2000 ans d\u00e9j\u00e0<\/strong><\/p>\n<p>On sait que les s\u00e9diments lacustres renferment des informations historiques - des lacustres aux retomb\u00e9es de c\u00e9sium de Tchernobyl en passant par l'apparition de substances nocives. Des chercheurs de l'Eawag ont maintenant franchi une \u00e9tape suppl\u00e9mentaire en utilisant une carotte de s\u00e9diments de 10 m\u00e8tres de long provenant du lac de Morat. Ils ont reconstitu\u00e9 l'histoire de l'utilisation des sols autour du lac \u00e0 partir des informations d\u00e9pos\u00e9es.<\/p>\n<p>Vers 100 av. J.-C., \u00e0 l'\u00e9poque o\u00f9 les Romains ont commenc\u00e9 \u00e0 d\u00e9fricher de grandes surfaces de for\u00eat autour du lac, on constate un changement rapide dans les s\u00e9diments : En peu de temps, une grande quantit\u00e9 de sol a \u00e9t\u00e9 entra\u00een\u00e9e dans le lac et, par cons\u00e9quent, de nombreux \u00e9l\u00e9ments nutritifs. Ainsi, le lac de Morat \u00e9tait d\u00e9j\u00e0 surfertilis\u00e9 il y a 2000 ans. Ce n'est qu'avec la chute de l'Empire romain et plusieurs p\u00e9riodes de climat nettement plus froid au d\u00e9but du Moyen \u00c2ge que la surfertilisation a de nouveau diminu\u00e9. Les effets de cette phase de l'\u00e9poque romaine sur l'\u00e9cologie du lac doivent encore \u00eatre \u00e9tudi\u00e9s plus en d\u00e9tail.<\/p>\n<p><strong>La r\u00e9sistance aux antibiotiques plus fr\u00e9quente dans les rejets de STEP<\/strong><\/p>\n<p>Dans les stations d'\u00e9puration (STEP), les germes f\u00e9caux rencontrent de nombreuses autres bact\u00e9ries ainsi qu'un cocktail de r\u00e9sidus d'antibiotiques et de polluants dans une eau relativement chaude. Dans ces conditions, des g\u00e8nes de r\u00e9sistance peuvent \u00eatre transmis \u00e0 des esp\u00e8ces jusque-l\u00e0 sensibles aux antibiotiques ou \u00e0 des bact\u00e9ries environnementales. Les bact\u00e9ries r\u00e9sistantes se retrouvent \u00e9galement dans l'environnement avec les eaux us\u00e9es \u00e9pur\u00e9es.<\/p>\n<p>Une \u00e9tude de l'Eawag a d\u00e9montr\u00e9 dans les s\u00e9diments du lac L\u00e9man au large de Lausanne que les g\u00e8nes de r\u00e9sistance sont plus fr\u00e9quents \u00e0 proximit\u00e9 d'un point de rejet. L'influence des eaux us\u00e9es est \u00e9galement d\u00e9montr\u00e9e pour d'autres cours d'eau. Le risque sanitaire li\u00e9 \u00e0 cette pollution est tr\u00e8s faible. N\u00e9anmoins, les chercheurs impliqu\u00e9s plaident pour que, lors de l'extension des STEP avec des \u00e9tapes de traitement contre les micropolluants, on veille en m\u00eame temps \u00e0 \u00e9liminer le plus grand nombre possible de r\u00e9sistances aux antibiotiques avant qu'elles ne se r\u00e9pandent dans l'environnement.<\/p>","protected":false},"excerpt":{"rendered":"<p>Die Seenforschung bietet immer wieder neue \u00dcberraschungen. Am Infotag des Wasserforschungsinstitutes Eawag liessen sich Fachleute \u00fcber neue Ergebnisse und Trends informieren. Im gross angelegten \u00abProjet Lac\u00bb untersuchte die Eawag von 2010 bis 2015 zusammen mit den Kantonen, dem Bundesamt f\u00fcr Umwelt, der Universit\u00e4t Bern und dem Naturhistorischen Museum der Berner Burgergemeinde sowie weiteren Partnern die [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9416,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_focuskw":"Seen","_yoast_wpseo_metadesc":"Seen sind bedeutende \u00d6kosysteme. Seit \u00fcber 100 Jahren werden ihre Geheimnisse in der Schweiz bereits erforscht. Dennoch gibt es immer wieder \u00dcberraschungen.","articlekey":"","footnotes":""},"categories":[580],"tags":[1011,218,2099],"class_list":["post-508","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sustainability","tag-eawag","tag-forschung","tag-see"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Schweizer Seen l\u00fcften Geheimnisse - Organisator<\/title>\n<meta name=\"description\" content=\"Seen sind bedeutende \u00d6kosysteme. Seit \u00fcber 100 Jahren werden ihre Geheimnisse in der Schweiz bereits erforscht. 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