{"id":58618,"date":"2024-02-04T16:39:57","date_gmt":"2024-02-04T16:39:57","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/les-toiles-daraignee-piegent-ladn-laisse-par-les-animaux-vivant-a-proximite"},"modified":"2024-02-04T17:33:51","modified_gmt":"2024-02-04T17:33:51","slug":"les-toiles-daraignee-piegent-ladn-laisse-par-les-animaux-vivant-a-proximite","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/les-toiles-daraignee-piegent-ladn-laisse-par-les-animaux-vivant-a-proximite","title":{"rendered":"Les toiles d&rsquo;araign\u00e9e pi\u00e8gent l&rsquo;ADN laiss\u00e9 par les animaux vivant \u00e0 proximit\u00e9"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>C\u2019est en Australie que le doctorant en biodiversite\u0301 ge\u0301ne\u0301tique a\u0300 l\u2019Universite\u0301 Curtin (Perth), Josh Newton, et son e\u0301quipe ont fait une curieuse de\u0301couverte. S\u2019il est peu probable qu\u2019une toile d\u2019araigne\u0301e puisse pie\u0301ger un e\u0301le\u0301phant, sa capacite\u0301 a\u0300 retenir de minuscules fragments d\u2019ADN laisse\u0301 par les animaux dans l\u2019environnement pourrait changer la fac\u0327on dont les scientifiques e\u0301tudient la faune et la flore.<\/p>\n<p>Pour aboutir a\u0300 ces re\u0301sultats, les chercheurs australiens ont collecte\u0301 49 toiles d\u2019araigne\u0301es provenant du zoo de Perth et de la re\u0301serve boise\u0301e de Karakamia, a\u0300 une cinquantaine de kilome\u0300tres. Leur e\u0301tude a e\u0301te\u0301 publie\u0301e le 30 janvier 2024 dans la revue iScience.<\/p>\n<p><b>2,5 millions de se\u0301quences d\u2019ADN pie\u0301ge\u0301es dans les toiles d&rsquo;araigne\u0301e<\/b><\/p>\n<p>De retour au laboratoire, les chercheurs ont amplifie\u0301 les petites quantite\u0301s d\u2019ADN environnemental (ADNe) pie\u0301ge\u0301es dans les toiles d\u2019araigne\u0301es. Et les re\u0301sultats sont prometteurs: les chercheurs ont re\u0301ussi a\u0300 identifier pre\u0300s de 2,5 millions de se\u0301quences d\u2019ADN, dont 1 million de se\u0301quences d&rsquo;ADN humain \u2013 qu&rsquo;ils ont isole\u0301es et exclues de l\u2019analyse.<\/p>\n<p>Les toiles d\u2019araigne\u0301es de la re\u0301serve contenaient le mate\u0301riel ge\u0301ne\u0301tique de 32 espe\u0300ces de verte\u0301bre\u0301s, dont 16 mammife\u0300res, 14 oiseaux, un reptile et un amphibien. L\u2019analyse a e\u0301galement permis de de\u0301tecter l\u2019ADN du renard roux, de la souris domestique et du rat noir \u2013 des espe\u0300ces envahissantes qui n\u2019ont rien a\u0300 faire en Australie.<\/p>\n<p>Les toiles d\u2019araigne\u0301es du zoo, elles, contenaient le mate\u0301riel ge\u0301ne\u0301tique de 61 espe\u0300ces de verte\u0301bre\u0301s, dont 33 mammife\u0300res, 21 oiseaux, cinq reptiles et deux amphibiens. Cette plus grande varie\u0301te\u0301 d\u2019ADN \u00ab\u00a0refle\u0300te largement la diversite\u0301 des espe\u0300ces exotiques he\u0301berge\u0301es dans le zoo\u00a0\u00bb, expliquent les scientifiques dans leur e\u0301tude.<\/p>\n<p><b>Plus l\u2019animal est gros, plus la quantite\u0301 d&rsquo;ADN pie\u0301ge\u0301e est importante<\/b><\/p>\n<p>Selon Josh Newton et son e\u0301quipe, plus l\u2019enclos de l\u2019animal est proche de la toile, plus la probabilite\u0301 de retrouver son ADN est e\u0301leve\u0301e. Ainsi, ils ont identifie\u0301 de l\u2019ADN d\u2019animaux dont les cages e\u0301taient situe\u0301es jusqu\u2019a\u0300 195 me\u0300tres des toiles d\u2019araigne\u0301es. Autre relation logique: plus l\u2019animal est gros \u2013 comme les girafes ou les e\u0301le\u0301phants \u2013, plus la quantite\u0301 d\u2019ADN pie\u0301ge\u0301e dans la toile d\u2019araigne\u0301e est importante.<\/p>\n<p>Toutes ces caracte\u0301ristiques font des toiles d\u2019araigne\u0301es une me\u0301thode peu cou\u0302teuse, facile a\u0300 utiliser et non-invasive pour surveiller les animaux sauvages et les e\u0301cosyste\u0300mes. D\u2019autant qu\u2019elles sont largement pre\u0301sentes dans les environnements \u2013 naturels comme anthropoge\u0301niques \u2013 et qu\u2019elles ne\u0301cessitent un effort d\u2019e\u0301chantillonnage minimal.<\/p>\n<p>\u00ab\u00a0E\u0301tant donne\u0301 qu\u2019il suffit de quelques traces d\u2019ADN pour identifier les animaux, cette me\u0301thode pourrait changer la fac\u0327on dont nous explorons et prote\u0301geons notre biodiversite\u0301 terrestre\u00a0\u00bb, indique Josh Newton a\u0300 ABC. Avant de conclure: \u00ab\u00a0Utiliser les toiles d\u2019araigne\u0301es comme des filets a\u0300 ADN ouvre la voie a\u0300 des recherches dans des environnements difficiles d\u2019acce\u0300s. Avec le de\u0301clin de la biodiversite\u0301 a\u0300 l\u2019e\u0301chelle mondiale, la surveillance des espe\u0300ces devient de plus en plus importante.\u00a0\u00bb<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. C\u2019est en Australie que le doctorant en biodiversite\u0301 ge\u0301ne\u0301tique a\u0300 l\u2019Universite\u0301 Curtin (Perth), Josh Newton, et son e\u0301quipe ont fait une curieuse de\u0301couverte. S\u2019il est peu probable qu\u2019une toile d\u2019araigne\u0301e puisse pie\u0301ger un e\u0301le\u0301phant, sa capacite\u0301 a\u0300 retenir de minuscules fragments d\u2019ADN laisse\u0301 par les animaux dans l\u2019environnement pourrait changer la fac\u0327on [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":58617,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-58618","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":"<!-- 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>Les toiles d&#039;araign\u00e9e pi\u00e8gent l&#039;ADN laiss\u00e9 par les animaux vivant \u00e0 proximit\u00e9 - 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