{"id":73457,"date":"2025-12-14T12:00:00","date_gmt":"2025-12-14T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/frelons-geants-contre-grenouilles-etude-japonaise"},"modified":"2025-12-15T00:35:49","modified_gmt":"2025-12-15T00:35:49","slug":"frelons-geants-contre-grenouilles-etude-japonaise","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise","title":{"rendered":"Frelons G\u00e9ants Contre Grenouilles: \u00c9tude Japonaise"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>On avait de\u0301ja\u0300 trouve\u0301, dans l\u2019estomac de la grenouille Pelophylax nigromaculatus, des restes de frelons, des insectes dont une seule piqu\u0302re peut e\u0302tre fatale a\u0300 un petit verte\u0301bre\u0301. Mais une question se posait encore: est-ce que ces amphibiens e\u0301vitent les dards lors de leur attaque ou re\u0301sistent-ils aux piqu\u0302res?<\/p>\n<p>Pour re\u0301pondre a\u0300 cette question, le chercheur Shinji Sugiura (Universite\u0301 de Kobe, Japon) a mis en place un protocole tre\u0300s simple: dans un laboratoire, il a place\u0301 des grenouilles face a\u0300 des frelons de diffe\u0301rentes espe\u0300ces et il a observe\u0301 la suite. Les re\u0301sultats de cette e\u0301tude, publie\u0301e le 3 de\u0301cembre 2025 dans la revue Ecosphere, re\u0301ve\u0300lent l\u2019e\u0301tonnante re\u0301sistance de ces grenouilles de quelques grammes face a\u0300 des frelons ge\u0301ants.<\/p>\n<p><b>L\u2019un des insectes les plus dangereux au monde pour adversaire<\/b><\/p>\n<p>Ces insectes sont redoutables: grands, ils portent en eux une importante quantite\u0301 d\u2019un venin capable de causer des douleurs intenses, des dommages aux tissus et des effets syste\u0301miques, notamment cardiaques. Pour ne pas laisser la place au doute, le scientifique japonais n\u2019a pas he\u0301site\u0301 a\u0300 fournir a\u0300 la petite P. nigromaculatus de terribles adversaires. Des frelons V. simillima et V. analis collecte\u0301s dans la nature. Mais surtout l\u2019e\u0301norme frelon Vespa mandarinia, qui dispute le titre d\u2019insecte le plus dangereux du monde.<\/p>\n<p>Quarante-cinq grenouilles ont e\u0301te\u0301 confronte\u0301es a\u0300 l\u2019un des 45 frelons (15 V. simillima, 15 V. analis et 15 V. mandarinia). Elles n\u2019e\u0301taient mises en face d\u2019un frelon qu\u2019une fois, et l\u2019espe\u0300ce de l\u2019adversaire e\u0301tait choisie pour correspondre au gabarit de l\u2019amphibien (certaines ne pesaient pas plus de 6 grammes et la plus lourde affichait seulement 76 grammes sur la balance). Ainsi les grenouilles les plus fre\u0302les n\u2019e\u0301taient tout de me\u0302me pas place\u0301es face a\u0300 un Vespa mandarinia.<\/p>\n<p><b>\u00ab De\u0301couverte a\u0300 la fois unique et passionnante \u00bb<\/b><\/p>\n<p>Quasiment toutes les grenouilles sont passe\u0301es a\u0300 l\u2019attaque et les frelons ont cherche\u0301 a\u0300 se de\u0301fendre en les piquant. 93% des grenouilles contre V. simillima, 87% des grenouilles contre les V. analis et 79% de celles contre les redoutables V. mandarinia ont mange\u0301 leur proie. Et aucun insecte n\u2019a e\u0301te\u0301 re\u0301gurgite\u0301 apre\u0300s avoir e\u0301te\u0301 avale\u0301. Les piqu\u0302res de frelons \u2014 les grenouilles ont e\u0301te\u0301 pique\u0301es a\u0300 la face, dans les yeux ou encore sur la langue \u2014 n\u2019ont ni tue\u0301 ni blesse\u0301 ces amphibiens.<\/p>\n<p>\u00ab Alors qu\u2019une souris de taille similaire peut mourir d\u2019une seule piqu\u0302re, les grenouilles n\u2019ont montre\u0301 aucun dommage apparent, me\u0302me apre\u0300s avoir e\u0301te\u0301 pique\u0301es a\u0300 plusieurs reprises, s\u2019e\u0301tonne Shinji Sugiura dans un communique\u0301. Cette extraordinaire re\u0301sistance a\u0300 un venin puissant rend cette de\u0301couverte a\u0300 la fois unique et passionnante \u00bb.<\/p>\n<p>En outre, tous les individus ont repris un comportement normal peu apre\u0300s avoir e\u0301te\u0301 pique\u0301s, relate l\u2019e\u0301tude. Cela voudrait dire que le venin ne tue pas ces grenouilles mais qu\u2019en plus, la douleur engendre\u0301e s\u2019estompe rapidement.<\/p>\n<p>Comment est-ce possible? Le me\u0301canisme derrie\u0300re cette tole\u0301rance reste pour le moment un myste\u0300re, ce qui fait de cette grenouille un mode\u0300le parfait pour mieux comprendre la re\u0301sistance aux venins.<\/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. On avait de\u0301ja\u0300 trouve\u0301, dans l\u2019estomac de la grenouille Pelophylax nigromaculatus, des restes de frelons, des insectes dont une seule piqu\u0302re peut e\u0302tre fatale a\u0300 un petit verte\u0301bre\u0301. Mais une question se posait encore: est-ce que ces amphibiens e\u0301vitent les dards lors de leur attaque ou re\u0301sistent-ils aux piqu\u0302res? Pour re\u0301pondre a\u0300 [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":73456,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-73457","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>Frelons G\u00e9ants Contre Grenouilles: \u00c9tude Japonaise - Senegal<\/title>\n<meta name=\"description\" content=\"On avait de\u0301ja\u0300 trouve\u0301, dans l\u2019estomac de la grenouille Pelophylax nigromaculatus, des restes de frelons, des insectes ...\" \/>\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\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Frelons G\u00e9ants Contre Grenouilles: \u00c9tude Japonaise\" \/>\n<meta property=\"og:description\" content=\"On avait de\u0301ja\u0300 trouve\u0301, dans l\u2019estomac de la grenouille Pelophylax nigromaculatus, des restes de frelons, des insectes ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-14T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-15T00:35:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/12\/sm_1765787403.507115.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\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Frelons G\u00e9ants Contre Grenouilles: \u00c9tude Japonaise\",\"datePublished\":\"2025-12-14T12:00:00+00:00\",\"dateModified\":\"2025-12-15T00:35:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\"},\"wordCount\":588,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2025\/12\/sm_1765787403.507115.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/frelons-geants-contre-grenouilles-etude-japonaise\",\"name\":\"Frelons G\u00e9ants Contre Grenouilles: \u00c9tude Japonaise - 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