{"id":16048,"date":"2017-11-20T20:00:28","date_gmt":"2017-11-20T19:00:28","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil\/?p=16048"},"modified":"2017-11-19T10:00:16","modified_gmt":"2017-11-19T09:00:16","slug":"une-foret-fossilisee-vieille-de-280-millions-dannees-a-ete-decouverte-en-antarctique","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/une-foret-fossilisee-vieille-de-280-millions-dannees-a-ete-decouverte-en-antarctique\/","title":{"rendered":"Une for\u00eat fossilis\u00e9e vieille de 280 millions d&rsquo;ann\u00e9es a \u00e9t\u00e9 d\u00e9couverte en Antarctique"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>Il fut un temps o\u00f9 la glace ne dominait pas l&rsquo;Antarctique : des chercheurs am\u00e9ricains viennent en effet de trouver les restes d&rsquo;une for\u00eat vieille de 280 millions d&rsquo;ann\u00e9es sur le continent austral.<\/p>\n<p>L&rsquo;Antarctique n&rsquo;a pas toujours \u00e9t\u00e9 une terre de glace. Des scientifiques de l&rsquo;universit\u00e9 du Wisconsin \u00e0 Milwaukee ont en effet d\u00e9couvert les vestiges d&rsquo;une flore impressionnante en plein c\u0153ur du continent blanc. Des fossiles qui dateraient de plus de 280 millions d&rsquo;ann\u00e9es, comme le rapporte le site Live Science.<\/p>\n<p>Il y a 252 millions d&rsquo;ann\u00e9es, l&rsquo;extinction Permien-Trias a boulevers\u00e9 l&rsquo;\u00e9tat de la plan\u00e8te. L&rsquo;\u00e9mission massive de gaz \u00e0 effet de serre par les volcans a entra\u00een\u00e9 une augmentation brutale des temp\u00e9ratures, donc un changement des climats terrestres, et a consid\u00e9rablement acidifi\u00e9 les oc\u00e9ans. Ainsi, plus de 95% des esp\u00e8ces pr\u00e9sentes sur Terre \u00e0 l&rsquo;\u00e9poque ont disparu.<\/p>\n<p>Le pal\u00e9o\u00e9cologiste Erik Gulbranson et son \u00e9quipe de chercheurs se sont donc rendus en Antarctique pour observer les effets de cette extinction sur la nature des continents. Au cours de leurs explorations, ils ont fini par trouver les fossiles d&rsquo;une for\u00eat datant d&rsquo;avant ce bouleversement.<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p>Avant cette extinction, le genre de plantes dominant en Antarctique \u00e9tait les&nbsp;<em>Glossopteris<\/em>, explique Erik Gulbranson \u00e0&nbsp;<a href=\"https:\/\/www.livescience.com\/60944-ancient-fossil-forest-discovered-in-antarctica.html?utm_source=twitter&amp;utm_medium=social#?utm_source=twitter&amp;utm_medium=social&amp;utm_campaign=2016twitterdlvrit\" target=\"_blank\" rel=\"noopener\" data-id=\"61\" data-m=\"{&quot;i&quot;:61,&quot;p&quot;:54,&quot;n&quot;:&quot;partnerLink&quot;,&quot;y&quot;:24,&quot;o&quot;:7}\">Live Science<\/a>. \u00c9teinte depuis, cette esp\u00e8ce pouvait mesurer de 20 \u00e0 40 m\u00e8tres de haut et \u00e9tait pr\u00e9sente massivement dans l&rsquo;h\u00e9misph\u00e8re Sud. \u00c0 cette \u00e9poque, les for\u00eats n&rsquo;\u00e9taient donc pas tr\u00e8s diversifi\u00e9es en terme de faune, et chacune des esp\u00e8ces avait un r\u00f4le bien particulier \u00e0 jouer dans la survie des autres. Le chercheur se demande donc pourquoi ces plantes robustes n&rsquo;ont pas surv\u00e9cu \u00e0 l&rsquo;extinction.&nbsp;<\/p>\n<p>Cette d\u00e9couverte est tr\u00e8s importante, puisqu&rsquo;il s&rsquo;agit l\u00e0 d&rsquo;un \u00ab\u00a0moyen de voir l&rsquo;avant, le pendant et l&rsquo;apr\u00e8s-extinction\u00a0\u00bb,&nbsp;explique Erik Gulbranson. Ces 13 restes d&rsquo;arbres fossilis\u00e9s pourraient donc permettre d&rsquo;avoir une id\u00e9e un peu plus pr\u00e9cise des cons\u00e9quences de l&rsquo;extinction et de leur chronologie.<\/p>\n<p>Erik Gulbranson et son \u00e9quipe de chercheurs retourneront en Antarctique de la fin du mois de novembre \u00e0 janvier 2018 pour continuer leurs travaux et \u00ab\u00a0mieux comprendre comment les gazs \u00e0 effet de serre&nbsp;et les changements climatiques ont pu affecter la vie sur Terre\u00a0\u00bb.<\/p>\n<p>source :&nbsp;<a href=\"https:\/\/www.msn.com\/fr-fr\/actualite\/monde\/une-for%C3%AAt-fossilis%C3%A9e-vieille-de-280-millions-dann%C3%A9es-a-%C3%A9t%C3%A9-d%C3%A9couverte-en-antarctique\/ar-BBF5S0x\" target=\"_blank\" rel=\"noopener\">https:\/\/www.msn.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"16048\">(780)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Il fut un temps o\u00f9 la glace ne dominait pas l&rsquo;Antarctique : des chercheurs am\u00e9ricains viennent en effet de trouver&#8230;<\/p>\n","protected":false},"author":1,"featured_media":16049,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"Une for\u00eat fossilis\u00e9e vieille de 280 millions d'ann\u00e9es a \u00e9t\u00e9 d\u00e9couverte en Antarctique @laterredufutur","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[33],"tags":[1252,314,5558,4511],"class_list":["post-16048","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","tag-antarctique","tag-foret","tag-fossile","tag-millions-dannees","wpcat-33-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/11\/foret-fossile-antarctique.jpg?fit=716%2C415&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-4aQ","jetpack-related-posts":[{"id":20736,"url":"https:\/\/www.laterredufutur.com\/accueil\/decouverte-de-vestiges-dune-foret-tropicale-vieille-de-90-millions-dannees-sous-la-glace-antarctique\/","url_meta":{"origin":16048,"position":0},"title":"D\u00e9couverte de vestiges d&rsquo;une for\u00eat tropicale vieille de 90 millions d&rsquo;ann\u00e9es sous la glace antarctique","author":"Admin","date":"1 mai 2020","format":false,"excerpt":"Des traces fossiles d'une ancienne for\u00eat tropicale ont \u00e9t\u00e9 d\u00e9couvertes en Antarctique occidental. Il y a environ 90 millions d'ann\u00e9es, l'Antarctique occidental abritait une for\u00eat pluviale temp\u00e9r\u00e9e florissante, selon les racines fossiles, le pollen et les spores r\u00e9cemment d\u00e9couverts l\u00e0-bas, selon une nouvelle \u00e9tude. Le monde \u00e9tait un endroit diff\u00e9rent\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/04\/foret-tropicale-antarctique.jpg?fit=1024%2C506&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/04\/foret-tropicale-antarctique.jpg?fit=1024%2C506&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/04\/foret-tropicale-antarctique.jpg?fit=1024%2C506&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/04\/foret-tropicale-antarctique.jpg?fit=1024%2C506&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":23304,"url":"https:\/\/www.laterredufutur.com\/accueil\/il-y-a-75-millions-dannees-lantarctique-etait-recouverte-dimmenses-forets\/","url_meta":{"origin":16048,"position":1},"title":"Il y a 75 millions d&rsquo;ann\u00e9es, l&rsquo;Antarctique \u00e9tait recouverte d&rsquo;immenses for\u00eats","author":"Admin","date":"1 novembre 2021","format":false,"excerpt":"Les paysages gel\u00e9s de l'Antarctique sont le summum de la glace. Mais il y a des millions d'ann\u00e9es, le feu ravageait r\u00e9guli\u00e8rement le continent. C'est la conclusion d'une nouvelle recherche qui a trouv\u00e9 des preuves de feux r\u00e9guliers il y a environ 75 millions d'ann\u00e9es. Preuves de l'existence de for\u00eats\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/antarctique-et-forets.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/antarctique-et-forets.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/antarctique-et-forets.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/antarctique-et-forets.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/11\/antarctique-et-forets.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":26401,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-scientifiques-trouvent-des-preuves-de-lexistence-dune-ancienne-foret-en-antarctique\/","url_meta":{"origin":16048,"position":2},"title":"Des scientifiques trouvent des preuves de l&rsquo;existence d&rsquo;une ancienne for\u00eat en Antarctique","author":"Admin","date":"17 novembre 2024","format":false,"excerpt":"\" Il \u00e9tait fascinant de constater qu'\u00e0 un moment donn\u00e9 de l'histoire, les sept continents ont connu des conditions climatiques permettant aux arbres de survivre. \". Des scientifiques ont d\u00e9couvert de l'ambre dans une carotte de s\u00e9diments r\u00e9cup\u00e9r\u00e9e \u00e0 des milliers de pieds sous la surface de l'Antarctique, une d\u00e9couverte\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/11\/immense-foret-1.jpg?fit=1024%2C709&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/11\/immense-foret-1.jpg?fit=1024%2C709&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/11\/immense-foret-1.jpg?fit=1024%2C709&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2024\/11\/immense-foret-1.jpg?fit=1024%2C709&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":26474,"url":"https:\/\/www.laterredufutur.com\/accueil\/le-premier-echantillon-dambre-decouvert-en-antarctique-revele-lexistence-dune-foret-tropicale-pres-du-pole-sud\/","url_meta":{"origin":16048,"position":3},"title":"Le premier \u00e9chantillon d&rsquo;ambre d\u00e9couvert en Antarctique r\u00e9v\u00e8le l&rsquo;existence d&rsquo;une for\u00eat tropicale pr\u00e8s du p\u00f4le Sud","author":"Admin","date":"23 d\u00e9cembre 2024","format":false,"excerpt":"Imaginez une machine \u00e0 remonter le temps qui vous ram\u00e8nerait \u00e0 l'\u00e9poque des dinosaures. Soudain, vous vous retrouvez dans une for\u00eat dense et mar\u00e9cageuse, o\u00f9 les insectes bourdonnent entre les fleurs, les foug\u00e8res et les conif\u00e8res. Croyez-le ou non, vous vous trouvez en Antarctique occidental. Des scientifiques allemands et britanniques\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2019\/12\/foret-380millions-dannees.jpg?fit=1024%2C768&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":2778,"url":"https:\/\/www.laterredufutur.com\/accueil\/glaciation-de-lantarctique-une-origine-atmospherique\/","url_meta":{"origin":16048,"position":4},"title":"Glaciation de l&rsquo;Antarctique : une origine atmosph\u00e9rique","author":"Admin","date":"15 avril 2005","format":false,"excerpt":"Voil\u00e0 une d\u00e9couverte qui prouve qu'un changement climatique peut \u00eatre radicalement brutal. Deux articles de la revue Paleoceanography, suite \u00e0 une autre publication d\u00e9but 2003 dans Nature, battent en br\u00e8che la th\u00e9orie la plus g\u00e9n\u00e9ralement avanc\u00e9e pour expliquer la formation de la calotte glaciaire de l'Antarctique il y a 32\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/Banquise.jpeg?fit=356%2C278&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":7791,"url":"https:\/\/www.laterredufutur.com\/accueil\/des-palmiers-decouverts-sous-les-glaces-de-lantarctique\/","url_meta":{"origin":16048,"position":5},"title":"Des palmiers d\u00e9couverts sous les glaces de l&rsquo;Antarctique !","author":"Admin","date":"30 ao\u00fbt 2015","format":false,"excerpt":"La th\u00e9orie de la d\u00e9rive des plaques tectoniques encore remise en question... la th\u00e9orie de l'hydroplaque renforc\u00e9e... Les forages scientifiques dans l'\u00e9paisse glace de Wilkes Land, en Antarctique de l' Est (la partie faisant face \u00e0 l'Australie) ont fourni les preuves de \" la croissance de for\u00eats tropicales caract\u00e9ris\u00e9es par\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/palmier-sous-la-neige.gif?fit=499%2C314&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16048","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=16048"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16048\/revisions"}],"predecessor-version":[{"id":16050,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/16048\/revisions\/16050"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/16049"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=16048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=16048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=16048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}