{"id":13598,"date":"2024-05-29T12:00:00","date_gmt":"2024-05-29T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/les-chenilles-sont-capables-de-detecter-un-predateur-grace-a-son-champ-electrique"},"modified":"2024-05-30T01:33:49","modified_gmt":"2024-05-30T01:33:49","slug":"les-chenilles-sont-capables-de-detecter-un-predateur-grace-a-son-champ-electrique","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/les-chenilles-sont-capables-de-detecter-un-predateur-grace-a-son-champ-electrique","title":{"rendered":"Les chenilles sont capables de d\u00e9tecter un pr\u00e9dateur gr\u00e2ce \u00e0 son champ \u00e9lectrique"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Pour e\u0301chapper a\u0300 leurs pre\u0301dateurs, les proies ont souvent diffe\u0301rents outils a\u0300 leur disposition, visibles comme invisibles. C\u2019est le cas des chenilles qui sont capables de repe\u0301rer le champ e\u0301lectrique produit par les insectes qui pourraient e\u0302tre tente\u0301s de les manger.<\/p>\n<p><b>Un champ de force invisible mais pre\u0301cieux chez ceux capables de le ressentir<\/b><\/p>\n<p>La communaute\u0301 scientifique sait bien qu\u2019un champ e\u0301lectrique peut confe\u0301rer aux animaux d\u2019e\u0301tonnants super-pouvoirs. Par exemple, les vers Caenorhabditis elegans peuvent utiliser le champ e\u0301lectrique d\u2019un insecte pour se de\u0301poser sur lui, et s\u2019en servir ensuite de taxi. Et les pollinisateurs sont capables de repe\u0301rer le champ e\u0301lectrique autour des fleurs.<\/p>\n<p>Des phe\u0301nome\u0300nes possibles car les \u201cobjets charge\u0301s e\u0301lectriquement e\u0301mettent des champs e\u0301lectriques qui exercent des forces sur d\u2019autres objets charge\u0301s\u201d. Et \u201cparce que les animaux et les plantes sont presque toujours charge\u0301s e\u0301lectriquement\u201d, expliquent deux chercheurs de l\u2019Universite\u0301 de Bristol (Royaume-Uni) dans une e\u0301tude parue le 20 mai 2024 dans la revue Pnas. Il suffit donc qu\u2019un autre organisme soit sensible a\u0300 cette charge e\u0301lectrique.<\/p>\n<p>Ce champ de force invisible pourrait rentrer dans la course a\u0300 l\u2019armement qui se joue entre proie et pre\u0301dateur et qui conduit chacun a\u0300 vouloir localiser l\u2019autre, pour lui e\u0301chapper ou pour l\u2019attraper, a\u0300 l\u2019aide de ses sens. Pour en savoir plus sur cette potentielle interaction invisible a\u0300 nos yeux, les scientifiques britanniques ont re\u0301alise\u0301 des analyses sur des chenilles de trois espe\u0300ces (Tyria jacobaeae, Telochurus recens et Aglais io) et sur un pre\u0301dateur, la gue\u0302pe commune (Vespula vulgaris).<\/p>\n<p><b>Des poils qui bougent selon le champ e\u0301lectrique<\/b><\/p>\n<p>De cette fac\u0327on, ils ont de\u0301couvert que ces trois espe\u0300ces de chenilles sont bien capables de repe\u0301rer un champ e\u0301lectrique identique a\u0300 celui produit par une gue\u0302pe lorsqu\u2019elle vole (les animaux terrestres accumulent une charge e\u0301lectrostatique lorsqu\u2019ils bougent dans leur environnement). Les chenilles adoptent ensuite des comportements anti-pre\u0301dateurs destine\u0301s a\u0300 la de\u0301fense (enroulement, morsure&#8230;). Encore fallait-il trouver quelle partie de leur anatomie est e\u0301lectro-re\u0301ceptive. C\u2019est aussi chose faite.<\/p>\n<p>Ce sont les set\u00e6 des chenilles, des sortes de poils, qui jouent le ro\u0302le de re\u0301cepteurs. Ces derniers bougent en re\u0301ponse aux champs e\u0301lectriques et sont sensibles a\u0300 un champ oscillant a\u0300 une fre\u0301quence qui correspond aux battements des ailes de leur pre\u0301dateur (180 Hz). \u201cCette modulation existe parce que les ailes sont charge\u0301es et, a\u0300 mesure qu\u2019elles battent, oscillant de plus en plus pre\u0300s de la proie, l\u2019intensite\u0301 du champ e\u0301lectrique augmente lorsque les ailes sont plus proches et diminue lorsque les ailes sont plus e\u0301loigne\u0301es, cre\u0301ant une oscillation du champ e\u0301lectrique\u201d, de\u0301taille l\u2019e\u0301tude. Pour les chercheurs, cette de\u0301couverte de\u0301voile une dimension cache\u0301e des interactions entre les proies et les pre\u0301dateurs terrestres.<\/p>\n<p>Les auteurs de cette nouvelle e\u0301tude s\u2019inquie\u0300tent de l\u2019impact que peuvent avoir les lignes e\u0301lectriques sur cette capacite\u0301. \u201cIl a de\u0301ja\u0300 e\u0301te\u0301 de\u0301montre\u0301 que de nombreuses espe\u0300ces de chenilles mangent moins, deviennent stresse\u0301es et acce\u0301le\u0300rent leur de\u0301veloppement lorsqu\u2019elles sont expose\u0301es a\u0300 des sons aux me\u0302mes fre\u0301quences teste\u0301es dans cette e\u0301tude\u201d, alertent les chercheurs. Ils craignent que les \u201cbruits e\u0301lectriques\u201d produits par l\u2019humain ne brouillent cette capacite\u0301 de de\u0301tection si pre\u0301cieuse pour la survie des chenilles.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/sao-tome-e-principe\">S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; S\u00e3o Tom\u00e9 e Pr\u00edncipe. Pour e\u0301chapper a\u0300 leurs pre\u0301dateurs, les proies ont souvent diffe\u0301rents outils a\u0300 leur disposition, visibles comme invisibles. C\u2019est le cas des chenilles qui sont capables de repe\u0301rer le champ e\u0301lectrique produit par les insectes qui pourraient e\u0302tre tente\u0301s de les manger. Un champ de force invisible mais pre\u0301cieux chez [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":13597,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,55,56],"class_list":["post-13598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-sao-tome-e-principe","tag-sao-tome-e-principe"],"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 chenilles sont capables de d\u00e9tecter un pr\u00e9dateur gr\u00e2ce \u00e0 son champ \u00e9lectrique - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Pour e\u0301chapper a\u0300 leurs pre\u0301dateurs, les proies ont souvent diffe\u0301rents outils 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