{"id":74172,"date":"2026-01-06T12:00:00","date_gmt":"2026-01-06T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/un-rythme-sans-precedent-16-000-nouvelles-especes"},"modified":"2026-01-06T22:29:58","modified_gmt":"2026-01-06T22:29:58","slug":"un-rythme-sans-precedent-16-000-nouvelles-especes","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/un-rythme-sans-precedent-16-000-nouvelles-especes","title":{"rendered":"Un Rythme sans Pr\u00e9c\u00e9dent: 16 000 Nouvelles Esp\u00e8ces"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>En 1758, le naturaliste sue\u0301dois Carl von Linne\u0301 pose les jalons de la taxonomie moderne. Il entreprend d\u2019identifier, de nommer et de classifier tous les organismes vivants sur Terre. Pour cela, il formalise le syste\u0300me de nomenclature binomiale, la combinaison de deux noms permettant de de\u0301signer une espe\u0300ce. Il de\u0301crit ainsi plus de 10.000 espe\u0300ces de plantes et d\u2019animaux.<\/p>\n<p>Pre\u0300s de 300 ans plus tard, plus de 2 millions d\u2019espe\u0300ces ont e\u0301te\u0301 de\u0301nombre\u0301es. Des ge\u0301ne\u0301rations de biologistes ont poursuivi les travaux de leur pre\u0301de\u0301cesseur et re\u0301pertorie\u0301 toutes les nouvelles espe\u0300ces de\u0301couvertes, dans le but de de\u0301peindre au mieux la biodiversite\u0301 terrestre.<\/p>\n<p><b>\u00ab Le rythme de description a atteint un niveau record \u00bb<\/b><\/p>\n<p>Loin d\u2019un plafonnement, une e\u0301tude mene\u0301e par l\u2019Universite\u0301 d\u2019Arizona et publie\u0301e dans la revue Science Advances a montre\u0301 que le nombre de nouvelles espe\u0300ces identifie\u0301es connaissait une progression sans pre\u0301ce\u0301dent. \u00ab Nos re\u0301sultats sugge\u0300rent qu\u2019au cours des 20 dernie\u0300res anne\u0301es, le rythme global de description des espe\u0300ces a atteint un niveau record, contrairement a\u0300 l\u2019ide\u0301e rec\u0327ue selon laquelle la plupart des espe\u0300ces auraient de\u0301ja\u0300 e\u0301te\u0301 de\u0301crites et, par conse\u0301quent, le rythme de description serait en baisse \u00bb, e\u0301crivent les auteurs dans leur publication.<\/p>\n<p>L\u2019e\u0301quipe de chercheurs chinois et ame\u0301ricains a analyse\u0301 l\u2019histoire taxonomique d\u2019environ 2 millions d\u2019espe\u0300ces, couvrant tous les groupes d\u2019organismes vivants. Entre 2015 et 2020, plus de 16.000 nouvelles espe\u0300ces ont e\u0301te\u0301 recense\u0301es chaque anne\u0301e. Parmi celles-ci, plus de 10.000 animaux \u2013 principalement des arthropodes et des insectes, 2.500 plantes et 2.000 champignons. \u00ab Ces milliers d\u2019espe\u0300ces nouvellement de\u0301couvertes chaque anne\u0301e ne sont pas seulement des organismes microscopiques, mais aussi des insectes, des plantes, des champignons et me\u0302me des centaines de nouveaux verte\u0301bre\u0301s \u00bb, s\u2019est enthousiasme\u0301 John Wiens, professeur au de\u0301partement d\u2019e\u0301cologie et de biologie e\u0301volutive de l\u2019Universite\u0301 d\u2019Arizona et co-auteur de la publication.<\/p>\n<p><b>La biodiversite\u0301 terrestre n\u2019a jamais e\u0301te\u0301 aussi bien de\u0301crite<\/b><\/p>\n<p>\u00ab Notre bonne nouvelle est que ce rythme de de\u0301couverte de\u0301passe largement le rythme d\u2019extinction des espe\u0300ces \u00bb, poursuit John Wiens. En effet, le taux d\u2019extinction est commune\u0301ment estime\u0301 entre 0,01 % et 0,1 % des espe\u0300ces par an \u2013 soit entre 200 et 2000 espe\u0300ces disparues, en conside\u0301rant les 2 millions d\u2019espe\u0300ces connues. De fait, la biodiversite\u0301 est mieux connue aujourd\u2019hui que jamais auparavant.<\/p>\n<p>Toutefois, cette acce\u0301le\u0301ration des de\u0301couvertes ne signifie pas que de nouvelles espe\u0300ces apparaissent plus rapidement: le phe\u0301nome\u0300ne de spe\u0301ciation demeure un processus beaucoup plus lent.<\/p>\n<p>Mais quelles nouvelles techniques ont permis d\u2019atteindre ce taux de de\u0301couvertes record? D\u2019une part, les technologies d\u2019exploration ont e\u0301te\u0301 significativement ame\u0301liore\u0301es. GPS, drones, satellites, capteurs acoustiques et pie\u0300ges photographiques ont permis la prospection de lieux inaccessibles \u2013 canope\u0301es, grottes, fonds marins \u2013 et la de\u0301tection d\u2019animaux discrets. En paralle\u0300le, le de\u0301veloppement de me\u0301thodes d\u2019analyse ADN a permis de pre\u0301ciser les distinctions interspe\u0301cifiques. Il est de\u0301sormais possible d\u2019identifier des espe\u0300ces a\u0300 partir de fragments biologiques et de distinguer des organismes visuellement semblables mais ge\u0301ne\u0301tiquement diffe\u0301rents.<\/p>\n<p>\u00ab Actuellement, la plupart des nouvelles espe\u0300ces sont identifie\u0301es par leurs caracte\u0301ristiques visibles, mais a\u0300 mesure que les outils mole\u0301culaires s\u2019ame\u0301liorent, nous de\u0301couvrirons des espe\u0300ces encore plus cryptiques \u2013 des organismes identifiables uniquement au niveau ge\u0301ne\u0301tique. C\u2019est particulie\u0300rement prometteur pour la de\u0301couverte de bacte\u0301ries et de champignons uniques \u00bb, explique John Wiens.<\/p>\n<p><b>Recenser de nouvelles espe\u0300ces pour prote\u0301ger, mais aussi pour s\u2019inspirer<\/b><\/p>\n<p>Les auteurs de ces travaux soulignent l\u2019importance de recenser de nouvelles espe\u0300ces et de de\u0301crire leurs habitats et leur mode de vie. \u00ab Les espe\u0300ces ne peuvent e\u0302tre prote\u0301ge\u0301es tant qu\u2019elles n\u2019ont pas e\u0301te\u0301 de\u0301crites scientifiquement. La documentation est la premie\u0300re e\u0301tape vers la conservation: on ne peut pas prote\u0301ger une espe\u0300ce de l\u2019extinction si on ignore son existence \u00bb, analyse le chercheur.<\/p>\n<p>En outre, ces de\u0301couvertes ame\u0301liorent les connaissances en biologie des organismes, contribuant a\u0300 l\u2019e\u0301laboration de nouveaux produits ou technologies. Parmi ces inventions inspire\u0301es du vivant, on peut citer l\u2019aspirine, de\u0301rive\u0301e une substance provenant du saule, le captopril, un antihypertenseur provenant du venin d\u2019un serpent (Bothrops jararaca) ou encore des syste\u0300mes de ventilation inspire\u0301s des nids de termites. Autant de bonnes raisons d\u2019en apprendre plus sur la biodiversite\u0301 qui nous entoure.<\/p>\n<p>\u00ab Il reste tant a\u0300 de\u0301couvrir, et chaque nouvelle de\u0301couverte nous rapproche un peu plus de la compre\u0301hension et de la protection de l\u2019incroyable biodiversite\u0301 de notre plane\u0300te \u00bb, conclut John Wiens.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. En 1758, le naturaliste sue\u0301dois Carl von Linne\u0301 pose les jalons de la taxonomie moderne. Il entreprend d\u2019identifier, de nommer et de classifier tous les organismes vivants sur Terre. Pour cela, il formalise le syste\u0300me de nomenclature binomiale, la combinaison de deux noms permettant de de\u0301signer une espe\u0300ce. Il de\u0301crit ainsi plus [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74171,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74172","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"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>Un Rythme sans Pr\u00e9c\u00e9dent: 16 000 Nouvelles Esp\u00e8ces - Senegal<\/title>\n<meta name=\"description\" content=\"En 1758, le naturaliste sue\u0301dois Carl von Linne\u0301 pose les jalons de la taxonomie moderne. 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