{"id":6571,"date":"2020-08-02T21:01:32","date_gmt":"2020-08-02T19:01:32","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?page_id=6571"},"modified":"2024-01-06T21:15:47","modified_gmt":"2024-01-06T20:15:47","slug":"ischnura-elegans-les-femelles","status":"publish","type":"page","link":"https:\/\/www.meslibellules.fr\/blog\/ischnura-elegans-les-femelles\/","title":{"rendered":"Ischnura elegans : les femelles"},"content":{"rendered":"\n

Ischnura elegans femelle : pr\u00e9sentation

Ischnura elegans, l'Agrion \u00e9l\u00e9gant, est tr\u00e8s commun et contrairement aux autres Coenagrionidae, on rencontre souvent les femelles. Elles sont les seules \u00e0 pr\u00e9senter une telle diversit\u00e9 puisqu'on compte deux formes immatures tr\u00e8s diff\u00e9rentes<\/strong> qui donnent trois formes matures.

Ces immatures<\/strong> sont\u00a0:
\u2014 Une forme violacea<\/em>, bleu lilas, taches postoculaires bleues avec une marque (spot) bleue sur le S8 (8\u00b0 segment).
\u2014 Une forme rufescens<\/em>, orang\u00e9e, ros\u00e9e ou rose-orang\u00e9, taches postoculaires de la m\u00eame couleur, avec un spot qui deviendra rapidement bleu sur le S8, mais qui ne pr\u00e9sente pas de ligne noire<\/strong> sur la suture hum\u00e9rale.<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Agrion<\/a><\/figure>\n
A gauche, Ischnura elegans femelle immature violacea, La Renaudi\u00e8re (France - 49), 01\/08\/2010<\/em>.
A droite, Ischnura elegans femelle immature rufescens, Etang de P\u00e9ronne (France - 49), 04\/06\/2011<\/em>.<\/figcaption><\/figure>\n\n\n\n\n\n

La forme I. e. violacea<\/em><\/span> va \u00e9voluer en 2 formes matures\u00a0:<\/strong>
\u2014 Une forme dite androchrome<\/em> (1), (2), de la m\u00eame couleur que les m\u00e2les matures, bleue, avec un spot bleu sur S8. (3)
\u2014 Une forme dite infuscans<\/em> (4), verte, taches postoculaires de la m\u00eame couleur, avec un spot sur S8 vert, qui deviendra terne ou brun verd\u00e2tre.

La forme I. e. rufescens<\/em><\/span> \u00e9volue vers une forme mature<\/strong> rufescens obsoleta<\/em> (5), plus sombre, terne, avec une tache sur S8 qui s'att\u00e9nue, s'assombrit sans g\u00e9n\u00e9ralement dispara\u00eetre. On la reconna\u00eet cependant toujours facilement \u00e0 l'absence d'un trait ou d'une bande noire bien nette sur la suture hum\u00e9rale.<\/p>\n\n\n\n

\"Les<\/a>
Les 3 formes de femelles matures Ischnura elegans. En haut I. e. androchrome, au milieu I. e. infuscans, en bas I. e. rufescens obsoleta.<\/figcaption><\/figure>\n\n\n\n

Tout ceci peut para\u00eetre un peu confus ou en tout cas complexe et on trouve un sch\u00e9ma tr\u00e8s int\u00e9ressant qui r\u00e9sume tout ceci dans Polyandry and alternative mating tactics<\/em>, Bryan D. Neff and Erik I. Svensson, Phil. Trans. R. Soc. B 2013 368, 20120045, published online 21 January 2013 (sur ce document, j'ai modifi\u00e9 infuscans obsoleta en rufescens obsoleta).<\/p>\n\n\n\n

\"Ontog\u00e9nie<\/a>
Ontog\u00e9nie du d\u00e9veloppement de la couleur pour Ischnura elegans femelle.<\/figcaption><\/figure>\n\n\n\n

Cette volont\u00e9 de ranger chaque femelle dans une bo\u00eete diff\u00e9rente, mature\/immature par exemple, se heurte \u00e0 la r\u00e9alit\u00e9 du terrain, puisqu'elles ne deviennent pas matures tout d'un coup<\/em>. On peut donc trouver tous les interm\u00e9diaires entre les formes matures et immatures, c'est-\u00e0-dire des variantes des 5 formes de femelles. On trouve m\u00eame des femelles difficiles \u00e0 classer m\u00eame si on conna\u00eet bien toutes les formes.

Par souci de simplification, K.-D. B. Dijkstra, dans Guide des Libellules de France et d'Europe<\/em>, 2007, a regroup\u00e9 les formes immatures et matures afin de cr\u00e9er les types A, B et C, comme on le voit ci-dessous. Ne nous voilons pas la face, c'est tr\u00e8s commode, car comme dit plus haut, d\u00e9finir si une femelle est mature ou immature est parfois tr\u00e8s d\u00e9licat et c'est ce que j'ai adopt\u00e9 dans les pages suivantes, m\u00eame si je me suis risqu\u00e9 souvent \u00e0 s\u00e9parer les immatures et les matures.<\/p>\n\n\n\n

Les femelles des formes violacea<\/em> et androchrome<\/em><\/strong> (type A) \u2192<\/strong><\/a>
Les femelles infuscans<\/strong><\/em> (type B) \u2192<\/a>
Les femelles rufescens<\/em> et rufescens obsoleta<\/em><\/strong> (type C) \u2192<\/a><\/p>\n\n\n\n

<\/div>\n\n\n\n
\"\"<\/a><\/figure>\n\n\n\n
<\/div>\n\n\n\n

-1- Androchrome signifie de la m\u00eame couleur que le m\u00e2le<\/em>.
-2- Parfois appel\u00e9e typica<\/em>
-3-De tr\u00e8s rares formes androchromes ne passent pas par le stade violacea mais par une forme vert clair comme les m\u00e2les immatures... voir Reflectance spectra and mating patterns support intraspecific mimicry in the colour polymorphic damselfly Ischnura elegans<\/em>, Hans Van Gossum \u2022 Jessica Bots \u2022 Jasper Van Heusden \u2022 Martijn Hammers \u2022 Katleen Huyghe \u2022 Nathan I. Morehouse, Evol Ecol (2011) 25:139\u2013154
-4- Infuscans du latin infusco<\/em>, signifie devenir brun, devenir terne<\/em>.
-5- ... parfois appel\u00e9, de fa\u00e7on incompr\u00e9hensible pour moi, infuscans obsoleta , voir The Dragonglies of Europe<\/em>, Askew 2004, ou d'autres publication scientifiques. Mais dans Michael J. Parr (1999) THE TERMINOLOGY OF FEMALE POLYMORPHS OF ISCHNURA<\/em> (ZYGOPTERA: COENAGRIONIDAE), International Journal of Odonatology, 2:1, 95-99, DOI: 10.1080\/13887890.1999.9748116<\/a> qui n'a \u00e9t\u00e9 mis enligne qu'en 2012, il est logiquement sugg\u00e9r\u00e9 que cette forme soit appel\u00e9 rufescens obsoleta<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Ischnura elegans femelle : pr\u00e9sentation Ischnura elegans, l'Agrion \u00e9l\u00e9gant, est tr\u00e8s commun et contrairement aux autres Coenagrionidae, on rencontre souvent les femelles. Elles sont les seules \u00e0 pr\u00e9senter une telle diversit\u00e9 puisqu'on compte deux formes immatures tr\u00e8s diff\u00e9rentes qui donnent trois formes matures. Ces immatures sont\u00a0:\u2014 Une forme violacea, bleu lilas, taches postoculaires bleues avec […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","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":""},"class_list":["post-6571","page","type-page","status-publish","hentry"],"yoast_head":"\nIschnura elegans femelle - 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