{"id":3564,"date":"2014-11-24T15:09:31","date_gmt":"2014-11-24T20:09:31","guid":{"rendered":"http:\/\/sciencemediacentre.ca\/site\/?p=3564"},"modified":"2014-11-24T15:09:31","modified_gmt":"2014-11-24T20:09:31","slug":"des-fossiles-danticosti-reecrivent-une-histoire-vieille-de-444-millions-dannees","status":"publish","type":"post","link":"http:\/\/sciencemediacentre.ca\/site\/des-fossiles-danticosti-reecrivent-une-histoire-vieille-de-444-millions-dannees\/","title":{"rendered":"Des fossiles d’Anticosti r\u00e9\u00e9crivent une histoire vieille de 444 millions d’ann\u00e9es"},"content":{"rendered":"
\"Ces<\/a>

Ces fossiles proviennent de l\u2019\u00eele d\u2019Anticosti et jettent une lumi\u00e8re nouvelle sur une extinction massive pass\u00e9e. (Photo: Andr\u00e9 Desrochers)<\/p><\/div>\n

L\u2019\u00e9pisode d\u2019extinction de masse survenu il a environ 444 millions d\u2019ann\u00e9es aurait \u00e9t\u00e9 caus\u00e9 par une s\u00e9rie de glaciations, et non par une seule grande glaciation. Voil\u00e0 ce que r\u00e9v\u00e8le une nouvelle \u00e9tude qui montre que l\u2019extinction survenue \u00e0 la limite entre l’Ordovicien et le Silurien aurait \u00e9limin\u00e9 pr\u00e8s de 85% des esp\u00e8ces vivantes dans les oc\u00e9ans. <\/span><\/p>\n

Les chercheurs ont analys\u00e9 des fossiles r\u00e9cup\u00e9r\u00e9s sur l\u2019\u00eele d\u2019Anticosti (qui se trouvait alors pr\u00e8s de l\u2019\u00e9quateur) afin de reconstruire un portrait d\u00e9taill\u00e9 de la hausse et de la chute du niveau des oc\u00e9ans. Ils ont ensuite compar\u00e9 ces donn\u00e9es avec ceux d\u2019une \u00e9tude men\u00e9e au Maroc (qui se trouvait\u00a0 alors pr\u00e8s du p\u00f4le Sud). <\/span><\/p>\n

Ils concluent qu\u2019il y a eu une s\u00e9rie successive de glaciations et de fonte des glaciers, et non pas une seule glaciation importante.<\/span><\/p>\n

Pour lire l\u2019article original publi\u00e9 dans Nature Communications\u00a0<\/em>le\u00a01\u00a0septembre 2014<\/span><\/b>,\u00a0cliquez ici<\/span><\/a>.<\/p>\n

Auteur \u00e0 contacter pour plus d\u2019information<\/strong><\/em><\/span><\/p>\n

Andr\u00e9 Desrochers, Universit\u00e9 d\u2019Ottawa, Ontario<\/span><\/h4>\n","protected":false},"excerpt":{"rendered":"

L\u2019\u00e9pisode d\u2019extinction de masse survenu il a environ 444 millions d\u2019ann\u00e9es aurait \u00e9t\u00e9 caus\u00e9 par une s\u00e9rie de glaciations, et non par une seule grande glaciation. Voil\u00e0 ce que r\u00e9v\u00e8le une nouvelle \u00e9tude qui montre que l\u2019extinction survenue \u00e0 la limite entre l’Ordovicien et le Silurien aurait \u00e9limin\u00e9 pr\u00e8s de 85% des esp\u00e8ces vivantes dans […]<\/p>\n","protected":false},"author":3,"featured_media":3546,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_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":""},"categories":[531],"tags":[1323,388,257,846],"class_list":["post-3564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-paper-of-interest-fr","tag-biodiversite","tag-changements-climatiques","tag-fossile","tag-ontario-fr"],"jetpack_featured_media_url":"http:\/\/sciencemediacentre.ca\/site\/wp-content\/uploads\/2014\/11\/Anticosti-fossils.png","jetpack_shortlink":"https:\/\/wp.me\/p4DqbN-Vu","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/3564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/comments?post=3564"}],"version-history":[{"count":1,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/3564\/revisions"}],"predecessor-version":[{"id":3571,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/posts\/3564\/revisions\/3571"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/media\/3546"}],"wp:attachment":[{"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/media?parent=3564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/categories?post=3564"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/sciencemediacentre.ca\/site\/wp-json\/wp\/v2\/tags?post=3564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}