{"id":6759,"date":"2020-08-18T08:22:40","date_gmt":"2020-08-18T06:22:40","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=6759"},"modified":"2024-07-04T18:26:34","modified_gmt":"2024-07-04T16:26:34","slug":"aeshna-mixta-curiosites-2-2-humidite-dans-les-sacs-aeriens","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2020\/08\/18\/aeshna-mixta-curiosites-2-2-humidite-dans-les-sacs-aeriens\/","title":{"rendered":"Aeshna mixta &#8211; curiosit\u00e9s 2\/2 : humidit\u00e9 dans les sacs a\u00e9riens"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Sur cette page, lorsque je parle des sacs a\u00e9riens des libellules, j&rsquo;entends ceux que l&rsquo;on peut voir \u00e0 travers la cuticule des odonates sous forme d&rsquo;espaces cloisonn\u00e9s. Il en existe d&rsquo;autres, profonds, qui participent \u00e0 la respiration trach\u00e9ale, ce qui n&rsquo;est pas le cas de ces sacs visibles \u00e0 travers la transparence de la cuticule.<\/p>\n\n\n\n<p style=\"font-size:15px\">Le 20 septembre 2008, j&rsquo;ai eu la chance d&rsquo;observer un m\u00e2le Aeshna mixta dans mon jardin, pos\u00e9 sur une ronce. J&rsquo;ai fait de nombreuses photos, car il s&rsquo;est montr\u00e9 tr\u00e8s patient, en plein soleil, \u00e0 midi. J&rsquo;ai pu m&rsquo;approcher comme on s&rsquo;approche rarement des Aeshnidae, mais il s&rsquo;est envol\u00e9 quelques secondes apr\u00e8s celle-ci&nbsp;:<br><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/aeshna-mixta-sacs-aerien-condensation.jpg\"><img decoding=\"async\" width=\"1411\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/aeshna-mixta-sacs-aerien-condensation.jpg\" alt=\"Aeshna mixta m\u00e2le, humidit\u00e9 dans les sacs a\u00e9riens, Beaupr\u00e9au (France-49), 20\/09\/2008\" class=\"wp-image-6758 lazyload\" style=\"--smush-placeholder-width: 1411px; --smush-placeholder-aspect-ratio: 1411\/1204;width:578px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/aeshna-mixta-sacs-aerien-condensation.jpg 1411w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/aeshna-mixta-sacs-aerien-condensation-768x655.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/\/aeshna-mixta-sacs-aerien-condensation-1200x1024.jpg 1200w\" data-sizes=\"(max-width: 1411px) 100vw, 1411px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Aeshna mixta m\u00e2le, humidit\u00e9 dans les sacs a\u00e9riens, Beaupr\u00e9au (France-49), 20\/09\/2008<\/figcaption><\/figure>\n\n\n\n<p style=\"font-size:15px\">Ce n&rsquo;est qu&rsquo;en 2012 que j&rsquo;ai fait attention \u00e0 cette photo et l&rsquo;ai montr\u00e9e sur le forum <a href=\"https:\/\/www.insecte.org\/forum\/viewtopic.php?f=9&amp;t=94301&amp;hilit=Aeshna+mixta\">Le Monde des Insectes.<br><\/a>Si on clique sur la photo, on voit tr\u00e8s nettement ce qui ressemble \u00e0 des gouttes de condensation \u00e0 l&rsquo;int\u00e9rieur de ces sacs a\u00e9riens ! Tr\u00e8s \u00e9tonnant, mais voit-on souvent les sacs a\u00e9riens si bien d\u00e9limit\u00e9s et de si pr\u00e8s ? J&rsquo;imagine que si leur d\u00e9limitation est si visible, c&rsquo;est justement \u00e0 cause de l&rsquo;humidit\u00e9\u202f; pulv\u00e9risez de l&rsquo;eau sur un verre d\u00e9poli, il para\u00eet beaucoup plus transparent \/translucide. <br>Pourquoi, s&rsquo;il s&rsquo;agit de condensation, ne semble-t-il y avoir des gouttes que dans un des sacs et en particulier sur une cloison d&rsquo;un des sacs ? <br>La condensation se produit quand de l&rsquo;air humide est au contact d&rsquo;une paroi plus froide que lui. Il se serait produit un effet de serre, l&rsquo;air chaud et humide contenu dans ce sac se serait condens\u00e9 au contact de la cuticule plus froide. Ce n&rsquo;est gu\u00e8re convaincant d&rsquo;imaginer une telle diff\u00e9rence de temp\u00e9rature entre les deux milieux&#8230;<br><br>Cependant, c&rsquo;est certainement le r\u00f4le majeur de ces sacs a\u00e9riens que d&rsquo;isoler thermiquement la libellule et ses muscles thoraciques de la chaleur, mais aussi du froid, car on conna\u00eet bien son extr\u00eame sensibilit\u00e9 au froid et son besoin de chaleur pour voler.<br>L&rsquo;origine de ces gouttes reste pour moi un myst\u00e8re.<br><br>D&rsquo;autres r\u00f4les ou utilit\u00e9s sont attribu\u00e9s aux sacs a\u00e9riens et l&rsquo;observation montre qu&rsquo;ils sont parfois enfonc\u00e9s, comme la carrosserie d&rsquo;une voiture, et comme pour cette derni\u00e8re, les d\u00e9g\u00e2ts mineurs n&rsquo;affectent pas ses capacit\u00e9s \u00e0 poursuivre une activit\u00e9 normale ; un r\u00f4le&#8230; d&rsquo;airbag donc.<br><br>On lit parfois qu&rsquo;ils am\u00e9lioreraient la sustentation des libellules par un effet \u00ab\u00a0montgolfi\u00e8re\u00a0\u00bb, l&rsquo;air chaud contenu dans les sacs \u00e9tant plus l\u00e9ger que l&rsquo;air ambiant. J&rsquo;ai bien du mal \u00e0 penser que l&rsquo;air pourrait \u00eatre si chaud dans les sacs a\u00e9riens qu&rsquo;il jouerait un r\u00f4le de ballon sans nuire gravement au m\u00e9tabolisme de la libellule ; il faudrait aussi que l&rsquo;air se dilate et que le volume des sacs a\u00e9riens augmente sensiblement ce qui n&rsquo;a jamais \u00e9t\u00e9 observ\u00e9.<\/p>\n\n\n\n<div style=\"height:54px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-vertical is-layout-flex wp-container-core-buttons-is-layout-fe9cc265 wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.meslibellules.fr\/pagesweb\/aeshnidae\/Aeshna\/aeshnamixta\/aeshna-mixta-curiosites.php\">Retour<\/a><\/div>\n\n\n\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/www.meslibellules.fr\/pagesweb\/aeshnidae\/Aeshna\/aeshnamixta\/aeshna-mixta-accueil.php\">Accueil Aeshna mixta<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sur cette page, lorsque je parle des sacs a\u00e9riens des libellules, j&rsquo;entends ceux que l&rsquo;on peut voir \u00e0 travers la cuticule des odonates sous forme d&rsquo;espaces cloisonn\u00e9s. Il en existe d&rsquo;autres, profonds, qui participent \u00e0 la respiration trach\u00e9ale, ce qui n&rsquo;est pas le cas de ces sacs visibles \u00e0 travers la transparence de la cuticule. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[189,375,55],"tags":[191,340,376],"class_list":["post-6759","post","type-post","status-publish","format-image","hentry","category-aeshna-mixta","category-curiosite","category-france","tag-aeshna-mixta","tag-curiosite","tag-sacs-aeriens","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aeshna mixta - curiosit\u00e9s 2\/2 : humidit\u00e9 dans les sacs a\u00e9riens - Mes Libellules<\/title>\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.meslibellules.fr\/blog\/2020\/08\/18\/aeshna-mixta-curiosites-2-2-humidite-dans-les-sacs-aeriens\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aeshna mixta - curiosit\u00e9s 2\/2 : humidit\u00e9 dans les sacs a\u00e9riens - Mes Libellules\" \/>\n<meta property=\"og:description\" content=\"Sur cette page, lorsque je parle des sacs a\u00e9riens des libellules, j&rsquo;entends ceux que l&rsquo;on peut voir \u00e0 travers la cuticule des odonates sous forme d&rsquo;espaces cloisonn\u00e9s. Il en existe d&rsquo;autres, profonds, qui participent \u00e0 la respiration trach\u00e9ale, ce qui n&rsquo;est pas le cas de ces sacs visibles \u00e0 travers la transparence de la cuticule. 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Il en existe d&rsquo;autres, profonds, qui participent \u00e0 la respiration trach\u00e9ale, ce qui n&rsquo;est pas le cas de ces sacs visibles \u00e0 travers la transparence de la cuticule. 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