{"id":1353,"date":"2018-10-13T06:36:37","date_gmt":"2018-10-13T04:36:37","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=1353"},"modified":"2018-12-26T20:09:10","modified_gmt":"2018-12-26T19:09:10","slug":"ischnura-elegans-emergence-tres-tardive","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2018\/10\/13\/ischnura-elegans-emergence-tres-tardive\/","title":{"rendered":"Ischnura elegans &#8211; \u00c9mergence tr\u00e8s tardive"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive.jpg\"><img decoding=\"async\" width=\"1687\" height=\"1204\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive.jpg\" alt=\"\u00c9mergence tardive d'un Ischnura elegans m\u00e2le, Beaupr\u00e9au (France - 49)\" class=\"wp-image-1354 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive.jpg 1687w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive-768x548.jpg 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive-1200x856.jpg 1200w\" data-sizes=\"(max-width: 1687px) 100vw, 1687px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1687px; --smush-placeholder-aspect-ratio: 1687\/1204;\" \/><\/a><figcaption>\u00c9mergence tardive d&rsquo;un Ischnura elegans m\u00e2le, Beaupr\u00e9au (France &#8211; 49), 12\/10\/2018.<\/figcaption><\/figure>\n\n\n\n\n\n<p class=\"has-small-font-size\">La m\u00e9t\u00e9o de la fin de l&rsquo;\u00e9t\u00e9 et du d\u00e9but de l&rsquo;automne 2018 est exceptionnelle, tant par le manque de pluie que par les temp\u00e9ratures anormalement \u00e9lev\u00e9es, et des records centenaires sont parfois d\u00e9pass\u00e9s.<br>Sur la petite mare de mon jardin j&rsquo;avais d&rsquo;ailleurs not\u00e9 ces derniers jours la pr\u00e9sence de Sympetrum striolatum, m\u00e2le isol\u00e9 ou couple en ponte, ce qui est d\u00e9j\u00e0 inhabituel pour 2 raisons; d&rsquo;une part ils se font normalement rare \u00e0 cette saison et d&rsquo;autre part je n&rsquo;avais plus l&rsquo;habitude d&rsquo;en voir car il n&rsquo;y a plus d&rsquo;\u00e9mergences de cette esp\u00e8ce dans mon bassin depuis des ann\u00e9es en raison de la pr\u00e9sence des poissons (Carpes ko\u00ef et Ides) qui ne laissent aucune chance aux larves (sauf \u00e0 celles qui vivent essentiellement en surface dans les plantes). D&rsquo;ailleurs je suis persuad\u00e9 que les Sympetrum en tandem qui survolent le bassin prennent acte de la pr\u00e9sence bien visible de ces poissons car les pontes sont \u00e0 peine simul\u00e9es avant qu&rsquo;ils ne prennent le large.<\/p>\n\n\n\n<p class=\"has-small-font-size\">Ce 12 octobre 2018, vers 13 heures, en parcourant du regard les n\u00e9nuphars \u00e0 la recherche de grenouilles prenant le soleil, j&rsquo;ai tout de m\u00eame \u00e9t\u00e9 tr\u00e8s surpris de constater la pr\u00e9sence de ce tout jeune m\u00e2le, encore cramponn\u00e9 \u00e0 son exuvie. La temp\u00e9rature \u00e9tait alors de 22\u00b0C.&nbsp;<br><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive-2.jpg\"><img decoding=\"async\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/2018\/10\/ischnura-elegans-emergence-tardive-2.jpg\" alt=\"\u00c9mergence tardive d'un Ischnura elegans m\u00e2le, Beaupr\u00e9au (France - 49), 12\/10\/2018.\" class=\"wp-image-1356 lazyload\" width=\"615\" height=\"903\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 615px; --smush-placeholder-aspect-ratio: 615\/903;\" \/><\/a><figcaption>\u00c9mergence tardive d&rsquo;un Ischnura elegans m\u00e2le, Beaupr\u00e9au (France &#8211; 49), 12\/10\/2018.<\/figcaption><\/figure>\n\n\n\n\n\n<p class=\"has-small-font-size\">L&rsquo;esp\u00e8ce est consid\u00e9r\u00e9e \u00ab\u00a0bivoltine dans le sud de son aire de r\u00e9partition\u00a0\u00bb. Mais o\u00f9 est vraiment le d\u00e9but du sud de l&rsquo;aire :).<br>En Maine et Loire, les premiers individus issus de ponte de la fin de l&rsquo;\u00e9t\u00e9 pr\u00e9c\u00e9dent \u00e9mergent en d\u00e9but avril (le 7 pour ma \u00ab\u00a0meilleure\u00a0\u00bb date), mais il est impensable que celui-ci ait pass\u00e9 tout l&rsquo;\u00e9t\u00e9 sous forme de larve.<br>Ces premiers individus d&rsquo;avril s&rsquo;accouplent et pondent assez rapidement ce qui donne certainement lieu \u00e0 une seconde vague d&rsquo;\u00e9mergence car il serait tr\u00e8s \u00e9tonnant que sur un m\u00eame lieu l&rsquo;\u00e9mergence des larves issues de l&rsquo;\u00e9t\u00e9 ou de l&rsquo;automne pr\u00e9c\u00e9dent s&rsquo;\u00e9tende jusqu&rsquo;\u00e0 fin ao\u00fbt, soit sur 5 mois; j&rsquo;ai en effet des sujets \u00e9mergents le 30 ao\u00fbt en 2010, et une tr\u00e8s jeune le 11 septembre 2014.<br>Je pense donc avoir suffisamment d\u2019\u00e9l\u00e9ments pour affirmer que l&rsquo;esp\u00e8ce est bivoltine en Maine et Loire.<\/p>\n\n\n\n<p class=\"has-small-font-size\">Pour savoir si ce sujet est \u00ab\u00a0un accident climatique\u00a0\u00bb de 3\u00b0g\u00e9n\u00e9ration il faudrait conna\u00eetre la date la plus pr\u00e9coce de l&rsquo;\u00e9mergence des sujets de 2\u00b0 g\u00e9n\u00e9ration. Par exemple j&rsquo;ai un sujet tr\u00e8s jeune, presque \u00e9mergent le 7 juillet 2007; est-ce un tardif de premi\u00e8re g\u00e9n\u00e9ration, produit de l&rsquo;ann\u00e9e pr\u00e9c\u00e9dente (3 mois apr\u00e8s les premiers) ou un pr\u00e9coce de la 2\u00b0 g\u00e9n\u00e9ration :0022: .<br>Dans le second cas on peut estimer qu&rsquo;il se sera reproduit avant fin juillet, ce qui dans le cas de mon individu \u00e9mergent le 12 octobre laisse presque 2 mois et demi \u00e0 la larve pour se d\u00e9velopper.<br><em>Et pourquoi pas ?<br><\/em><br>Malheureusement son avenir est doublement sombre; la m\u00e9t\u00e9o doit finalement se d\u00e9grader pour revenir aux normales saisonni\u00e8res et il aura bien du mal \u00e0 assurer sa descendance, bien du mal \u00e0 trouver une femelle&#8230;<\/p>\n\n\n\n\n\n<p class=\"has-background has-small-font-size has-very-light-gray-background-color\"><a href=\"http:\/\/www.meslibellules.fr\/pagesweb\/coenagrionidae\/ischnura\/ischnura-elegans\/ischnura-elegans-trio.php\">Retour<\/a> aux Ischnura elegans (\u00ab\u00a0<em>trio en erreur<\/em>\u00ab\u00a0).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La m\u00e9t\u00e9o de la fin de l&rsquo;\u00e9t\u00e9 et du d\u00e9but de l&rsquo;automne 2018 est exceptionnelle, tant par le manque de pluie que par les temp\u00e9ratures anormalement \u00e9lev\u00e9es, et des records centenaires sont parfois d\u00e9pass\u00e9s.Sur la petite mare de mon jardin j&rsquo;avais d&rsquo;ailleurs not\u00e9 ces derniers jours la pr\u00e9sence de Sympetrum striolatum, m\u00e2le isol\u00e9 ou couple [&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":"default","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":[60,55,61],"tags":[],"class_list":["post-1353","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-france","category-france","category-ischnura-elegans","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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