{"id":12908,"date":"2024-04-11T12:00:00","date_gmt":"2024-04-11T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/paleontologie-decouverte-au-perou-dun-fossile-de-dauphin-de-riviere-vieux-de-16-millions-dannees"},"modified":"2024-04-12T05:07:34","modified_gmt":"2024-04-12T05:07:34","slug":"paleontologie-decouverte-au-perou-dun-fossile-de-dauphin-de-riviere-vieux-de-16-millions-dannees","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/paleontologie-decouverte-au-perou-dun-fossile-de-dauphin-de-riviere-vieux-de-16-millions-dannees","title":{"rendered":"Pal\u00e9ontologie: D\u00e9couverte au P\u00e9rou d\u2019un fossile de dauphin de rivi\u00e8re vieux de 16 millions d\u2019ann\u00e9es"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Plusieurs fossiles de cet animal ont e\u0301te\u0301 retrouve\u0301s dont un cra\u0302ne presque complet. Son e\u0301tude re\u0301ve\u0300le que ses plus proches parents vivent dans les rivie\u0300res d\u2019Asie.<\/p>\n<p>Il existe des dauphins d\u2019eau douce dans quelques-uns des plus grands fleuves du monde: l\u2019Amazone, l\u2019Indus ou le Gange. En tout, six espe\u0300ces, dont une quasi e\u0301teinte (le dauphin de Chine), sont recense\u0301es. Ces ce\u0301tace\u0301s, qui descendent d\u2019espe\u0300ces marines, sont plus petits que leurs conge\u0301ne\u0300res de l\u2019oce\u0301an et a\u0300 force de vivre dans l\u2019eau boueuse des estuaires, certains sont presque devenus aveugles. Le dernier spe\u0301cimen identifie\u0301, a\u0300 partir de fossiles, est Pebanista yacuruna, un animal qui vivait en Amazonie il y a 16 millions d\u2019anne\u0301es.<\/p>\n<p><b>Un environnement bien diffe\u0301rent d\u2019aujourd\u2019hui<\/b><\/p>\n<p>A l\u2019e\u0301poque, la re\u0301gion amazonienne formait un vaste syste\u0300me de lacs et de mare\u0301cages appele\u0301 Pebas. Ce paysage comprenait des e\u0301cosyste\u0300mes aquatiques, semi-aquatiques et terrestres (comme des mare\u0301cages ou des plaines inondables) et s\u2019e\u0301tendait sur ce qui est aujourd\u2019hui la Colombie, l\u2019E\u0301quateur, la Bolivie, le Pe\u0301rou et le Bre\u0301sil. C\u2019est dans cet environnement qu\u2019e\u0301voluait Pebanista yacuruna dont plusieurs restes ont e\u0301te\u0301 de\u0301couverts, au fil de campagnes de fouilles mene\u0301es depuis 20 ans, par une e\u0301quipe internationale sous la direction de l\u2019Universite\u0301 de Zurich (Suisse). Dans des conditions pluto\u0302t difficiles: les fossiles ne sont accessibles que durant la saison se\u0300che lorsque les rivie\u0300res sont basses et les roches se\u0301dimentaires expose\u0301es.<\/p>\n<p>Le fossile le plus repre\u0301sentatif de Pebanista yacuruna a e\u0301te\u0301 trouve\u0301 en 2018 mais ce n\u2019est qu\u2019il y a quelques mois que les pale\u0301ontologues ont extirpe\u0301 un cra\u0302ne presque complet, de\u0301sormais expose\u0301 au Muse\u0301e d\u2019histoire naturelle de Lima (au Pe\u0301rou), qui a permis de mieux comprendre son e\u0301cologie. Le dauphin fait l\u2019objet d\u2019une description de\u0301taille\u0301e dans la revue Science Advances: c\u2019e\u0301tait un animal de 3 a\u0300 3,5 me\u0300tres de longueur, soit le plus grand dauphin d\u2019eau douce connu a\u0300 ce jour.<\/p>\n<p>Il e\u0301tait dote\u0301 de cre\u0302tes faciales tre\u0300s de\u0301veloppe\u0301es, qui sont des structures osseuses spe\u0301cialise\u0301es associe\u0301es a\u0300 l\u2019e\u0301cholocalisation. Un sens tre\u0300s utile pour e\u0301voluer dans les eaux boueuses ou\u0300 la vision est re\u0301duite. Son museau allonge\u0301 et e\u0301quipe\u0301 de nombreuses dents indique qu\u2019il devait sans doute se nourrir de poissons comme les dauphins d\u2019eau douce actuels.<\/p>\n<p><b>Des liens avec l\u2019Asie<\/b><\/p>\n<p>Il y a 10 millions d\u2019anne\u0301es, l\u2019e\u0301cosyste\u0300me de l\u2019Amazonie a connu de profonds bouleversements et s\u2019est transforme\u0301 pour ressembler a\u0300 ce qu\u2019est la re\u0301gion aujourd\u2019hui. Des changements qui ont e\u0301te\u0301 fatals a\u0300 ce dauphin qui n\u2019a plus retrouve\u0301 les proies qu\u2019il avait l\u2019habitude de croquer. La place e\u0301tant libre, ce sont les ance\u0302tres des dauphins roses de l\u2019Amazone (Inia geoffrensis) qui ont pris le relai. Les pale\u0301ontologues ont voulu savoir si les deux espe\u0300ces e\u0301taient lie\u0301es mais, curieusement, les cousins les plus proches de Pebanista yacuruna ne sont pas les dauphins de l\u2019Amazone mais les dauphins des rivie\u0300res d\u2019Asie du Sud: le dauphin du Gange (Platanista gangetica) et le dauphin de l\u2019Indus (Platanista minor).<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Plusieurs fossiles de cet animal ont e\u0301te\u0301 retrouve\u0301s dont un cra\u0302ne presque complet. Son e\u0301tude re\u0301ve\u0300le que ses plus proches parents vivent dans les rivie\u0300res d\u2019Asie. Il existe des dauphins d\u2019eau douce dans quelques-uns des plus grands fleuves du monde: l\u2019Amazone, l\u2019Indus ou le Gange. En tout, six espe\u0300ces, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":12907,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-12908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"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>Pal\u00e9ontologie: D\u00e9couverte au P\u00e9rou d\u2019un fossile de dauphin de rivi\u00e8re vieux de 16 millions d\u2019ann\u00e9es - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Plusieurs fossiles de cet animal ont e\u0301te\u0301 retrouve\u0301s dont un cra\u0302ne presque complet. 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