{"id":14649,"date":"2023-06-28T12:53:14","date_gmt":"2023-06-28T12:53:14","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/le-megalodon-avait-le-sang-chaud"},"modified":"2023-06-28T13:27:16","modified_gmt":"2023-06-28T13:27:16","slug":"le-megalodon-avait-le-sang-chaud","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud","title":{"rendered":"Le m\u00e9galodon avait le sang chaud"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Membre de la famille de\u0301sormais de\u0301teinte des otodontide\u0301s, le me\u0301galodon a disparu des oce\u0301ans il y a environ trois millions d&rsquo;anne\u0301es. Une nouvelle e\u0301tude consacre\u0301e a\u0300 Otodus megalodon apporte des e\u0301le\u0301ments de preuve pour dire qu&rsquo;il avait le sang chaud. Ce travail, publie\u0301 dans Proceedings of the National Academy of Sciences, a e\u0301te\u0301 dirige\u0301 par Michael Griffiths et Martin Becker, professeurs a\u0300 l&rsquo;Universite\u0301 William Paterson, dans le New Jersey (Etats-Unis). Il est base\u0301 sur l&rsquo;analyse de dents fossiles de me\u0301galodons, tels qu&rsquo;il en existe plusieurs milliers d\u2019exemplaires dans les registres pale\u0301ontologiques mondiaux.<\/p>\n<p><b>Les dents du me\u0301galodon<\/b><\/p>\n<p>Pourquoi une telle prolixite\u0301 ? Les dents du requin disparu sont fortement mine\u0301ralise\u0301es et cette caracte\u0301ristique a facilite\u0301 leur fossilisation. Ainsi, ces reliques sont parvenues jusqu&rsquo;a\u0300 nous. En revanche, le squelette du me\u0301galodon n\u2019e\u0301tait pas forme\u0301 d\u2019os mais de cartilage. Comme ce mate\u0301riau se conserve mal, on n&rsquo;a jamais retrouve\u0301 le squelette entier de l&rsquo;animal : la connaissance qu&rsquo;ont les scientifiques a\u0300 son sujet se base sur l&rsquo;analyse de ses seules dents.<\/p>\n<p>Or les crocs peuvent e\u0302tre parlants. L&rsquo;e\u0301quipe de recherche les a scrute\u0301s selon une nouvelle approche : ils ont e\u0301tudie\u0301 la pre\u0301sence dans les dents fossiles de certains isotopes du carbone et de l&rsquo;oxyge\u0300ne (en l&rsquo;occurrence, le carbone-13 et l&rsquo;oxyge\u0300ne-18, qui diffe\u0301rent de la forme classique de leur atome respectif par le nombre de neutrons). La fac\u0327on dont ces isotopes se lient peut en effet e\u0302tre un marqueur de la tempe\u0301rature a\u0300 laquelle le mine\u0301ral s&rsquo;est forme\u0301.<\/p>\n<p><b>Un sang plus chaud que l&rsquo;eau dans laquelle e\u0301voluait le me\u0301galodon<\/b><\/p>\n<p>Conclusion des spe\u0301cialistes : \u00ab\u00a0Le me\u0301galodon avait une tempe\u0301rature corporelle globale de 27 \u00b0C, soit environ 7 degre\u0301s de plus que la tempe\u0301rature de l&rsquo;eau environnante et environ 5 degre\u0301s de plus que les requins a\u0300 sang chaud existants\u00a0\u00bb, commente aupre\u0300s de Sciences et Avenir le professeur Martin Becker. La grande taille du me\u0301galodon l&rsquo;a \u00ab\u00a0aide\u0301 a\u0300 maintenir sa tempe\u0301rature corporelle chaude\u00a0\u00bb, estime par ailleurs le spe\u0301cialiste.<\/p>\n<p>Les chercheurs parlent a\u0300 son propos d&rsquo;une \u00ab\u00a0endothermie re\u0301gionale\u00a0\u00bb, c&rsquo;est-a\u0300-dire que la tempe\u0301rature de son corps n&rsquo;e\u0301tait pas uniforme. C&rsquo;e\u0301tait de\u0301ja\u0300 ce que pensaient les spe\u0301cialistes du requin disparu, mais ils l&rsquo;avaient compris par de\u0301ductions, ne\u0301es des observations de la biologie des requins modernes. La nouveaute\u0301 de cette e\u0301tude, c&rsquo;est qu&rsquo;elle en a de\u0301niche\u0301 la preuve dans les dents de l&rsquo;animal. Parmi les requins modernes avec endothermie re\u0301gionale, le groupe comprenant les requins mako et les grands requins blancs ont une tempe\u0301rature corporelle moyenne allant de 22,0 a\u0300 26,6 \u00b0C. Soit de 10 a\u0300 21 \u00b0C supe\u0301rieure a\u0300 la tempe\u0301rature ambiante de l&rsquo;oce\u0301an. La nouvelle e\u0301tude sugge\u0300re que me\u0301galodon avait une tempe\u0301rature corporelle moyenne globale plus e\u0301leve\u0301e.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Membre de la famille de\u0301sormais de\u0301teinte des otodontide\u0301s, le me\u0301galodon a disparu des oce\u0301ans il y a environ trois millions d&rsquo;anne\u0301es. Une nouvelle e\u0301tude consacre\u0301e a\u0300 Otodus megalodon apporte des e\u0301le\u0301ments de preuve pour dire qu&rsquo;il avait le sang chaud. Ce travail, publie\u0301 dans Proceedings of the National Academy of Sciences, a [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":14648,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-14649","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"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>Le m\u00e9galodon avait le sang chaud - Djibouti<\/title>\n<meta name=\"description\" content=\"Membre de la famille de\u0301sormais de\u0301teinte des otodontide\u0301s, le me\u0301galodon a disparu des oce\u0301ans il y a environ trois mil ...\" \/>\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\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le m\u00e9galodon avait le sang chaud\" \/>\n<meta property=\"og:description\" content=\"Membre de la famille de\u0301sormais de\u0301teinte des otodontide\u0301s, le me\u0301galodon a disparu des oce\u0301ans il y a environ trois mil ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\" \/>\n<meta property=\"og:site_name\" content=\"Djibouti\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-28T12:53:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-28T13:27:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2023\/06\/sm_1687946110.632246.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\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=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Le m\u00e9galodon avait le sang chaud\",\"datePublished\":\"2023-06-28T12:53:14+00:00\",\"dateModified\":\"2023-06-28T13:27:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\"},\"wordCount\":547,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/djibouti\/sites\/52\/2023\/06\/sm_1687946110.632246.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Djibouti\",\"Djibouti\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\",\"url\":\"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/le-megalodon-avait-le-sang-chaud\",\"name\":\"Le m\u00e9galodon avait le sang chaud - 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