{"id":56589,"date":"2023-12-28T18:02:32","date_gmt":"2023-12-28T18:02:32","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons"},"modified":"2023-12-29T07:47:12","modified_gmt":"2023-12-29T07:47:12","slug":"un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons","title":{"rendered":"Un fossile jette le trouble sur l’origine des grosses baleines \u00e0 fanons"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span>C’est un fossile qui chamboule toute l’histoire des baleines a\u0300 fanons (mysticetes), qui comptent parmi les plus gros animaux ayant jamais ve\u0301cu sur Terre. De\u0301couvert sur une rive de la rivie\u0300re Murray, en Australie-Me\u0301ridionale, en 1921, il e\u0301tait conserve\u0301 dans les collections des Muse\u0301es Victoria jusqu’a\u0300 ce qu’il soit examine\u0301 par le pale\u0301ontologue Erich Fitzgerald, il y a une dizaine d’anne\u0301es. Il s’est ave\u0301re\u0301 d’une grande importance pour comprendre l’e\u0301volution des grandes baleines.<\/p>\n

Une origine remise en cause<\/b><\/p>\n

Jusqu\u2019a\u0300 pre\u0301sent, on pensait que le de\u0301but de la pe\u0301riode glaciaire dans l\u2019he\u0301misphe\u0300re Nord, il y a environ 3 millions d\u2019anne\u0301es, avait de\u0301clenche\u0301 l’apparition de baleines a\u0300 fanons ve\u0301ritablement gigantesques. Mais le fossile de\u0301couvert, l\u2019extre\u0301mite\u0301 avant de la ma\u0302choire infe\u0301rieure d\u2019une baleine inhabituellement grande, a\u0302ge\u0301e de 21 a\u0300 16 millions d\u2019anne\u0301es remet en cause cette the\u0301orie. D’apre\u0300s son examen, il appartenait a\u0300 une baleine d’environ 9 me\u0300tres de longueur, soit environ un tiers de la taille des plus grosses baleines actuelles. Cela prouve que \u00ab\u00a0les baleines a\u0300 fanons e\u0301taient de\u0301ja\u0300 en bonne voie pour devenir des ge\u0301antes de\u0300s cette e\u0301poque\u00a0\u00bb, explique, dans un communique\u0301, James Rule du Muse\u0301e d’histoire naturelle de Londres.<\/p>\n

Cette prise de masse pourrait s’expliquer par des facteurs tels que le gel de l’Antarctique, des changements dans les courants oce\u0301aniques ainsi que l’explosion de la biomasse planctonique. Faisant de l’he\u0301misphe\u0300re Sud, la re\u0301gion d’origine des baleines de grande taille bien avant que ces dernie\u0300res n’atteignent de telles dimensions dans l’he\u0301misphe\u0300re Nord. Cette the\u0300se est de\u0301fendue dans un article publie\u0301 dans les Proceedings of the Royal Society B Biological Sciences.<\/p>\n

Encore bien des questions<\/b><\/p>\n

Ce fossile prouve l’inte\u0301re\u0302t de prendre en compte les restes de ce\u0301tace\u0301s de l’he\u0301misphe\u0300re Sud pour comprendre l’e\u0301volution des baleines. Mais ceux-ci ne comptent que pour 19% de tout le registre fossile de ces animaux. Cette lacune laisse encore bien des questions irre\u0301solues et ne permet pas de se faire une image comple\u0300te de ce groupe et des relations qui ont pu exister entre les deux he\u0301misphe\u0300res.<\/p>\n

Un nouveau fossile devrait biento\u0302t apporter certaines re\u0301ponses. Celui d’une grosse baleine datant du Mioce\u0300ne, dont l’espe\u0300ce est encore inde\u0301termine\u0301e. Il a e\u0301te\u0301 de\u0301couvert pre\u0300s de Melbourne et est actuellement en cours d’extraction.<\/p>\n

Pour plus d’informations et d’analyses sur la Tchad<\/a>, suivez Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Tchad. C’est un fossile qui chamboule toute l’histoire des baleines a\u0300 fanons (mysticetes), qui comptent parmi les plus gros animaux ayant jamais ve\u0301cu sur Terre. De\u0301couvert sur une rive de la rivie\u0300re Murray, en Australie-Me\u0301ridionale, en 1921, il e\u0301tait conserve\u0301 dans les collections des Muse\u0301es Victoria jusqu’a\u0300 ce qu’il soit examine\u0301 par le […]<\/p>\n","protected":false},"author":82,"featured_media":56587,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-56589","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"yoast_head":"\nUn fossile jette le trouble sur l'origine des grosses baleines \u00e0 fanons - tchad<\/title>\n<meta name=\"description\" content=\"C'est un fossile qui chamboule toute l'histoire des baleines a\u0300 fanons (mysticetes), qui comptent parmi les plus gros an ...\" \/>\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\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un fossile jette le trouble sur l'origine des grosses baleines \u00e0 fanons\" \/>\n<meta property=\"og:description\" content=\"C'est un fossile qui chamboule toute l'histoire des baleines a\u0300 fanons (mysticetes), qui comptent parmi les plus gros an ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-28T18:02:32+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-12-29T07:47:12+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1703774152.682906.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"899\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Un fossile jette le trouble sur l’origine des grosses baleines \u00e0 fanons\",\"datePublished\":\"2023-12-28T18:02:32+00:00\",\"dateModified\":\"2023-12-29T07:47:12+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\"},\"wordCount\":479,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1703774152.682906.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"Tchad\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-fossile-jette-le-trouble-sur-lorigine-des-grosses-baleines-a-fanons\",\"name\":\"Un fossile jette le trouble sur l'origine des grosses baleines \u00e0 fanons - 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