{"id":21127,"date":"2023-11-02T20:38:56","date_gmt":"2023-11-02T20:38:56","guid":{"rendered":"https:\/\/www.africa-press.net\/madagascar\/politique\/la-memoire-des-pollens-enfouis-sous-locean"},"modified":"2023-11-02T21:57:18","modified_gmt":"2023-11-02T21:57:18","slug":"la-memoire-des-pollens-enfouis-sous-locean","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/la-memoire-des-pollens-enfouis-sous-locean","title":{"rendered":"La m\u00e9moire des pollens enfouis sous l\u2019oc\u00e9an"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Madagascar. <\/strong><\/span>A\u0300 quoi ressemblait la vie sur Terre il y a 140.000 ans ? \u201cL\u2019identification des pollens contenus dans les strates des se\u0301diments marins permet aux palynologues (spe\u0301cialistes du pollen, ndlr) de reconstituer parfaitement les e\u0301cosyste\u0300mes du passe\u0301\u201d, explique Se\u0301bastien Zaragosi, se\u0301dimentologue a\u0300 l\u2019Universite\u0301 de Bordeaux. Un travail fastidieux : \u201cSur une zone d\u2019e\u0301tudes, on va pre\u0301lever en moyenne 20 carottes de 50 me\u0300tres par forage sous-marin, en utilisant un carottier de 7 tonnes.\u201d<\/p>\n<p><b>Une reconstruction de la ve\u0301ge\u0301tation de la valle\u0301e de la Loire<\/b><\/p>\n<p>La pale\u0301oclimatologue Maria Sanchez Goni, professeure a\u0300 l\u2019Universite\u0301 de Bordeaux, a e\u0301tudie\u0301 un enregistrement des 140.000 dernie\u0300res anne\u0301es, pre\u0301leve\u0301 par 4.000 me\u0300tres de fond dans le golfe de Gascogne, a\u0300 200 kilome\u0300tres des co\u0302tes franc\u0327aises. Les pollens sont extraits du se\u0301diment a\u0300 l\u2019aide d\u2019acide chlorhydrique et fixe\u0301s sur des lames pour e\u0302tre observe\u0301s au microscope. Elle a pu reconstituer la ve\u0301ge\u0301tation de la valle\u0301e de la Loire, dont les pollens ont e\u0301te\u0301 apporte\u0301s au large par les alluvions. \u201cIl y avait la\u0300 une fore\u0302t tempe\u0301re\u0301e semblable a\u0300 celle d\u2019aujourd\u2019hui, avec des che\u0302nes, des noisetiers, des tilleuls.\u201d<\/p>\n<p><b>\u201cDe nombreuses productions du Giec sont base\u0301es sur ces donne\u0301es\u201d<\/b><\/p>\n<p>L\u2019e\u0301tude des pollens livre e\u0301galement des informations indispensables a\u0300 la compre\u0301hension de l\u2019e\u0301volution des climats. \u201cOn peut remonter sur deux millions d\u2019anne\u0301es, pre\u0301cise Se\u0301bastien Zaragosi. De nombreuses productions du Giec sont base\u0301es sur ces donne\u0301es, en paralle\u0300le de<\/p>\n<p><b>celles issues de la fonte du permafrost. \u201d<\/b><\/p>\n<p>Ainsi, cet enregistrement permet de reconstituer la tempe\u0301rature et les pre\u0301cipitations de l\u2019e\u0301poque et confirme la pre\u0301sence d\u2019un climat tempe\u0301re\u0301. L\u2019analyse, commence\u0301e en 2005, n\u2019est pas encore termine\u0301e. A\u0300 raison d\u2019un centime\u0300tre par jour, il faut compter pas moins de deux ans pour traiter l\u2019information d\u2019une seule colonne.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/madagascar\">Madagascar<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Madagascar. A\u0300 quoi ressemblait la vie sur Terre il y a 140.000 ans ? \u201cL\u2019identification des pollens contenus dans les strates des se\u0301diments marins permet aux palynologues (spe\u0301cialistes du pollen, ndlr) de reconstituer parfaitement les e\u0301cosyste\u0300mes du passe\u0301\u201d, explique Se\u0301bastien Zaragosi, se\u0301dimentologue a\u0300 l\u2019Universite\u0301 de Bordeaux. Un travail fastidieux : \u201cSur une zone [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":21126,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,50,49],"class_list":["post-21127","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-madagascar","tag-madagascar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La m\u00e9moire des pollens enfouis sous l\u2019oc\u00e9an - Madagascar<\/title>\n<meta name=\"description\" content=\"A\u0300 quoi ressemblait la vie sur Terre il y a 140.000 ans ? \u201cL\u2019identification des pollens contenus dans les strates des se ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/madagascar\/toutes-les-actualites\/la-memoire-des-pollens-enfouis-sous-locean\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La m\u00e9moire des pollens enfouis sous l\u2019oc\u00e9an\" \/>\n<meta property=\"og:description\" content=\"A\u0300 quoi ressemblait la vie sur Terre il y a 140.000 ans ? 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