{"id":55832,"date":"2023-12-15T15:00:49","date_gmt":"2023-12-15T15:00:49","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid"},"modified":"2023-12-15T17:03:17","modified_gmt":"2023-12-15T17:03:17","slug":"la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid","title":{"rendered":"La mouche des neiges s&rsquo;auto-ampute quand il fait trop froid"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>Il fait -5\u00b0C sur la neige et la mouche des neiges (qui vit dans le nord de l\u2019Ame\u0301rique et au Canada), de\u0301pourvue d\u2019ailes, ne s\u2019alimente plus. Mais elle peut encore s\u2019y de\u0301mener pour trouver un partenaire d\u2019accouplement.<\/p>\n<p>Cette prouesse, re\u0301serve\u0301e a\u0300 quelques rares insectes, se double d\u2019une autre adaptation plus e\u0301tonnante encore : la capacite\u0301 a\u0300 s\u2019auto-amputer de l\u2019une de ses longues pattes lorsqu\u2019elle commence a\u0300 geler, re\u0301ve\u0300lent des chercheurs ame\u0301ricains de l\u2019Universite\u0301 de Washington a\u0300 Seattle.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"287\" class=\"alignnone wp-image-55830 size-full\" src=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1702647117.326946.jpg\" srcset=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1702647117.326946.jpg 453w, https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1702647117.326946-300x190.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Une patte sacrifie\u0301e contre le gel<\/b><\/p>\n<p>Selon l&rsquo;e\u0301tude publie\u0301e dans la revue Current Biology, quand les tempe\u0301ratures s\u2019approchent de -10\u00b0C, le milieu interne encore liquide au bout des longues pattes de l\u2019animal peut se mettre a\u0300 geler. Ce signal peut induire en moins de trois secondes l\u2019auto-amputation de la patte, un re\u0301flexe que les chercheurs ont pu observer en temps re\u0301el en laboratoire. Ce phe\u0301nome\u0300ne parai\u0302t courant chez l\u2019animal car il a e\u0301te\u0301 retrouve\u0301 chez 20% des individus re\u0301colte\u0301s dans la nature gra\u0302ce au programme de science participative organise\u0301 par les chercheurs (Snow Fly).<\/p>\n<p><iframe loading=\"lazy\" title=\"The chilling tale of snow flies, self-amputation, survival and certain death\" width=\"696\" height=\"522\" src=\"https:\/\/www.youtube.com\/embed\/vGOFBjMoRpc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>\n<p><b>La mouche des neiges a he\u0301rite\u0301 d&rsquo;un re\u0301flexe ancestral<\/b><\/p>\n<p>Ce re\u0301flexe s\u2019ave\u0300re un moyen vital de prote\u0301ger la mouche des neiges du gel qui gagne autrement tout son corps et la tue. Il fait appel a\u0300 une se\u0301quence tre\u0300s pre\u0301cise d\u2019auto-amputation qui se produit a\u0300 la jonction du membre avec le corps. Chez les tipules, apparente\u0301es aux mouches des neiges &#8211; dont les faucheux aux grandes pattes de nos campagnes &#8211; ce me\u0301canisme existe aussi pour leur permettre d\u2019e\u0301chapper aux pre\u0301dateurs qui saisiraient leur patte.<\/p>\n<p>Cette adaptation e\u0301volutive d\u2019un re\u0301flexe ancestral permet a\u0300 la mouche des neiges adulte de continuer a\u0300 se de\u0301placer rapidement sur la couverture uniforme de la neige pendant les deux mois qui lui restent a\u0300 vivre, a\u0300 une e\u0301poque de l\u2019anne\u0301e ou\u0300 ses pre\u0301dateurs se font plus rares.<\/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. Il fait -5\u00b0C sur la neige et la mouche des neiges (qui vit dans le nord de l\u2019Ame\u0301rique et au Canada), de\u0301pourvue d\u2019ailes, ne s\u2019alimente plus. Mais elle peut encore s\u2019y de\u0301mener pour trouver un partenaire d\u2019accouplement. Cette prouesse, re\u0301serve\u0301e a\u0300 quelques rares insectes, se double d\u2019une autre adaptation plus e\u0301tonnante encore [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":55831,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-55832","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>La mouche des neiges s&#039;auto-ampute quand il fait trop froid - tchad<\/title>\n<meta name=\"description\" content=\"Il fait -5\u00b0C sur la neige et la mouche des neiges (qui vit dans le nord de l\u2019Ame\u0301rique et au Canada), de\u0301pourvue d\u2019ailes ...\" \/>\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\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La mouche des neiges s&#039;auto-ampute quand il fait trop froid\" \/>\n<meta property=\"og:description\" content=\"Il fait -5\u00b0C sur la neige et la mouche des neiges (qui vit dans le nord de l\u2019Ame\u0301rique et au Canada), de\u0301pourvue d\u2019ailes ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\" \/>\n<meta property=\"og:site_name\" content=\"tchad\" \/>\n<meta property=\"article:published_time\" content=\"2023-12-15T15:00:49+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-12-15T17:03:17+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1702647129.611399.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"898\" \/>\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=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"La mouche des neiges s&rsquo;auto-ampute quand il fait trop froid\",\"datePublished\":\"2023-12-15T15:00:49+00:00\",\"dateModified\":\"2023-12-15T17:03:17+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\"},\"wordCount\":394,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/tchad\/sites\/41\/2023\/12\/sm_1702647129.611399.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Tchad\",\"Tchad\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\",\"url\":\"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/la-mouche-des-neiges-sauto-ampute-quand-il-fait-trop-froid\",\"name\":\"La mouche des neiges s'auto-ampute quand il fait trop froid - 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