{"id":129232,"date":"2026-06-05T20:11:40","date_gmt":"2026-06-05T20:11:40","guid":{"rendered":"https:\/\/www.africa-press.net\/burkina-faso\/politique\/scorpion-armes-avec-structure-metallique-renforcee"},"modified":"2026-06-05T20:17:47","modified_gmt":"2026-06-05T20:17:47","slug":"scorpion-armes-avec-structure-metallique-renforcee","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/scorpion-armes-avec-structure-metallique-renforcee","title":{"rendered":"Scorpion: Armes avec Structure Me\u0301tallique Renforce\u0301e"},"content":{"rendered":"

Africa-Press – Burkina Faso. <\/strong><\/span>Pour attraper ses proies ou se de\u0301fendre des agressions, le scorpion n\u2019est pas manchot. Des pinces puissantes et un aiguillon venimeux sont les pie\u0300ces mai\u0302tresses de son arsenal. Des armes d\u2019autant plus redoutables et re\u0301sistantes qu\u2019elles contiennent du me\u0301tal, comme du zinc, du mangane\u0300se ou du fer.<\/p>\n

La pre\u0301sence de ces alliages biome\u0301caniques e\u0301tait identifie\u0301e depuis longtemps dans la cuticule de ces arthropodes, ainsi d\u2019ailleurs que chez la plupart des che\u0301lice\u0301re\u0301s (qui comprennent e\u0301galement les araigne\u0301es et les acariens). Mais aucune e\u0301tude, jusqu\u2019a\u0300 pre\u0301sent, n\u2019avait e\u0301value\u0301 pre\u0301cise\u0301ment la concentration de ces me\u0301taux et leur distribution dans les armes des scorpions.<\/p>\n

Au sein de la famille de ces arthropodes, les strate\u0301gies de de\u0301fenses et d\u2019attaques varient grandement selon les espe\u0300ces. Certains scorpions ne piqueront leur proie que si elle re\u0301siste, d\u2019autres utiliseront leur aiguillon quasi syste\u0301matiquement. Certains sont munis de grosses pinces et d\u2019un petit dard, tandis que c\u2019est l\u2019inverse pour d\u2019autres.<\/p>\n

Du zinc a\u0300 l’extre\u0301mite\u0301 du dard<\/b><\/p>\n

Une e\u0301quipe du Smithsonian Institute (Washington, Etats-Unis) a choisi de se pencher sur 18 espe\u0300ces de scorpions (sur les 2000 de\u0301crites) au moyen de techniques de microscopie e\u0301lectronique en haute re\u0301solution et d\u2019analyses aux rayons X. Elle vient de publier ses re\u0301sultats dans le Journal of The Royal Society Interface.<\/p>\n

Pour le dard, les chercheurs ont trouve\u0301 du zinc concentre\u0301 a\u0300 l\u2019extre\u0301mite\u0301 de l\u2019aiguillon. Juste en dessous, c\u2019est le mangane\u0300se qui devient le me\u0301tal dominant. Une architecture que l\u2019on retrouve au niveau des pinces de l\u2019animal. Dans la partie mobile, autrement nomme\u0301e tarsus, les chercheurs ont repe\u0301re\u0301 soit du zinc soit une combinaison de zinc et de fer, mais uniquement, la\u0300 aussi, dans les parties terminales coupantes des pinces, ce qui a pour effet de renforcer les sections les plus soumises a\u0300 la tension lors de la capture d\u2019une proie.<\/p>\n

Des pinces fines plus durables<\/b><\/p>\n

L\u2019e\u0301quipe s\u2019attendait a\u0300 ce que les individus dote\u0301s des pinces les plus puissantes soient ceux contenant les plus fortes concentrations de fer. Or, c\u2019est tout l\u2019inverse qui a e\u0301te\u0301 observe\u0301. Le me\u0301tal est plus fre\u0301quemment pre\u0301sent chez les scorpions ayant des pinces longues et fines. Ce qui indiquerait que le fer joue moins ici un ro\u0302le dans la durete\u0301 des pinces que dans leur durabilite\u0301. En effet, les scorpions a\u0300 longues pinces doivent attraper les proies et les empe\u0302cher de s\u2019e\u0301chapper, les maintenant solidement enserre\u0301s le temps qu\u2019ils soient pique\u0301s par l\u2019aiguillon caudal et estourbis par le venin. Ce qui fait dire aux chercheurs qu\u2019il existe une relation e\u0301volutive entre la fac\u0327on dont les armes sont utilise\u0301es et les proprie\u0301te\u0301s des me\u0301taux qui les renforcent.<\/p>\n

Par la suite, les scientifiques pensent que les me\u0301thodes mises au point pour leur analyse de la cuticule des scorpions pourraient e\u0302tre employe\u0301es afin d’e\u0301tudier l\u2019enrichissement me\u0301tallique d\u2019autres arthropodes munis d\u2019un exosquelette externe, tels que les araigne\u0301es, gue\u0302pes ou fourmis.<\/p>\n

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

Africa-Press – Burkina Faso. Pour attraper ses proies ou se de\u0301fendre des agressions, le scorpion n\u2019est pas manchot. Des pinces puissantes et un aiguillon venimeux sont les pie\u0300ces mai\u0302tresses de son arsenal. Des armes d\u2019autant plus redoutables et re\u0301sistantes qu\u2019elles contiennent du me\u0301tal, comme du zinc, du mangane\u0300se ou du fer. La pre\u0301sence de ces […]<\/p>\n","protected":false},"author":82,"featured_media":129231,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-129232","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-burkina-faso"],"yoast_head":"\nScorpion: Armes avec Structure Me\u0301tallique Renforce\u0301e - Burkina Faso<\/title>\n<meta name=\"description\" content=\"Pour attraper ses proies ou se de\u0301fendre des agressions, le scorpion n\u2019est pas manchot. 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