{"id":11807,"date":"2022-11-08T18:46:12","date_gmt":"2022-11-08T17:46:12","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=11807"},"modified":"2023-01-04T21:50:28","modified_gmt":"2023-01-04T20:50:28","slug":"ischnura-aurora-brauer-1865","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2022\/11\/08\/ischnura-aurora-brauer-1865\/","title":{"rendered":"Ischnura aurora (Brauer, 1865)"},"content":{"rendered":"\n
\"Ischnura<\/a>
Ischnura aurora m\u00e2le, Australie (WA), Mayiba (Middle Springs), 22\/04\/2022<\/figcaption><\/figure>\n\n\n\n

Ce n’est qu’assez r\u00e9cemment que la taxonomie de ce petit Ischnura aurora \u00e9t\u00e9 r\u00e9gl\u00e9e. Il y a quelques ann\u00e9es, on pensait que sa distribution s’\u00e9tendait depuis le Pakistan jusqu’en Australie ; ce n’\u00e9tait pas sans poser quelques probl\u00e8mes, car m\u00eame les amateurs comme moi s’\u00e9taient bien \u00e9tonn\u00e9es d’une variabilit\u00e9, en particulier, sur l’\u00e9tendue des taches noires sur les derniers segments ou l’\u00e9tendue relative de ces taches noires et de la tache bleue.
Dumont en 2013 (2) a montr\u00e9 qu’\u00e0 l’ouest de la ligne de Wallace, il s’agissait d’un autre taxon, Ischnura rubilio<\/a> (ici au Rajasthan (Inde)). Il a m\u00eame d\u00e9montr\u00e9, et c’est vraiment \u00e9tonnant, que I. rubilio et I. aurora \u00e9taient sans rapport au niveau mol\u00e9culaire et que les 3 esp\u00e8ces d’Ischnura orange (aurora, rubilio et rufostigma<\/a> (ici au Vietnam)) n’\u00e9taient pas apparent\u00e9s et \u00e9taient apparus ind\u00e9pendamment : \u00ab\u00a0The conspicuous yellow and orange colours displayed by three of the Ischnura taxa included in the present study, finally, turn out to be no sign of relatedness, but arose independently<\/em>\u00ab\u00a0.<\/p>\n\n\n\n

Le probl\u00e8me de ces Ischnura orange avec un spot bleu est cependant d\u00e9licat en Asie, car ce probl\u00e8me taxonomique a engendr\u00e9 de nombreuses sous-esp\u00e8ces, pour tenter d’expliquer ces variations, qui s’ajoutent \u00e0 des variations locales ; que contient r\u00e9ellement Ischnura rufostigma, n’est-ce pas plut\u00f4t un groupe d’esp\u00e8ces qu’il conviendra de s\u00e9parer (3) ?<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnura<\/a><\/figure>\n
Ischnura aurora m\u00e2le, Australie (NT), Lietchfield Camp Site, 15\/04\/2022
Ischnura aurora m\u00e2le, Australie (NT), Mataranka Thermal Springs, 18\/04\/2022<\/figcaption><\/figure>\n\n\n\n

Quoi qu’il en soit, ces Ischnura tr\u00e8s color\u00e9s sont vraiment magnifiques ! Ils sont aussi tr\u00e8s petits \u00e0 peine plus de 24 mm.

Il faut noter sur ces photos la diff\u00e9rence de taille des pt\u00e9rostigmas, ceux des ailes ant\u00e9rieures \u00e9tant visiblement plus grands que ceux des ailes post\u00e9rieures, ceux-ci d’ailleurs parfois teint\u00e9s de rouge\u00e2tre ; les amateurs se souviendront qu’un des crit\u00e8res d’identification de nos femelles Ischnura pumilio est justement cette m\u00eame diff\u00e9rence de taille. Ils ne sont pourtant pas apparent\u00e9s, le plus proche de I. pumilio \u00e9tant sans doute I. rubilio<\/a> qui montre cependant aussi cette diff\u00e9rence de taille (et des pt\u00e9rostigmas post\u00e9rieurs rouge\u00e2tres…). Il est tout de m\u00eame \u00e9tonnant de retrouver 2 caract\u00e8res assez singuliers (taille et couleur des pt\u00e9rostigmas) pour I. aurora et I. rubilio sachant que ces 2 esp\u00e8ces se seraient d\u00e9velopp\u00e9es ind\u00e9pendamment.

On les trouve dans la v\u00e9g\u00e9tation des eaux stagnantes, mares, marais, \u00e9tangs et dans les parties tr\u00e8s calmes des eaux courantes. C’est d’ailleurs dans un espace mar\u00e9cageux de notre terrain de camping, peut-\u00eatre une mare en voie d’ass\u00e8chement, que j’ai trouv\u00e9 le premier de ces 2 m\u00e2les immatures :
<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnura<\/a><\/figure>\n
Ischnura aurora m\u00e2le immature, Australie (NT), Lietchfield Camp Site, 15\/04\/2022
Ischnura aurora m\u00e2le immature, Australie (WA), Marigu Billabong (Wyndham), 23\/04\/2022<\/figcaption><\/figure>\n\n\n\n

Les femelles sont sombres, sans spot bleu sur les derniers segments de l’abdomen.

Je n’ai pas vu d’accouplement, mais on lit dans une \u00e9tonnante communication de RJ Rowe (4) que les m\u00e2les ne s’accouplent qu’avec des femelles t\u00e9n\u00e9rales, c’est-\u00e0-dire tr\u00e8s immatures, encore \u00ab\u00a0molles\u00a0\u00bb ; malheureusement, il ne d\u00e9veloppe pas. Faut-il en conclure que les femelles sont matures sexuellement extraordinairement t\u00f4t ? Ou qu’elles disposent d’un organe qui lui permette de stocker le sperme le temps de devenir sexuellement mature ?

Il est encore difficile de conna\u00eetre la r\u00e9partition exacte de l’esp\u00e8ce ; sans doute est-elle limit\u00e9e, comme dit plus haut, \u00e0 l’est de la ligne de Wallace. On le trouve en tout cas aux Philippines, en Nouvelle-Guin\u00e9e, Nouvelle-Z\u00e9lande et Nouvelle-Cal\u00e9donie, aux Fidji, aux iles Cook et sans doute dans bien d’autres iles du Pacifique. On le trouve un peu partout en Australie sauf dans le centre.<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnura<\/a><\/figure>\n
Ischnura aurora femelle, Australie (NT), Victoria Highway (Baines), 21\/04\/2022
<\/figcaption><\/figure>\n\n\n\n

Ci-dessus, 2 photos d’une m\u00eame femelle ; l’abdomen des femelles est normalement compl\u00e8tement noir sur sa face sup\u00e9rieure et celle-ci est simplement tach\u00e9e par la boue du substrat qui s’est d\u00e9pos\u00e9 lors de pontes.
J’ai pass\u00e9 un peu de temps \u00e0 s\u00e9parer les femelles Ischnura aurora des femelles vertes Ischnura heterosticta ; les premi\u00e8res ont les pattes plus claires et une bande ant\u00e9hum\u00e9rale plus large. Et il est int\u00e9ressant de constater que le crit\u00e8re qui est finalement d\u00e9cisif est encore la diff\u00e9rence de taille des pt\u00e9rostigmas, bien visible sur les femelles ci-dessous, et particuli\u00e8rement sur le contre-jour. Pour Ischnura heterosticta, ils sont de la m\u00eame taille.<\/p>\n\n\n\n

\n
\"Ischnura<\/a><\/figure>\n\n\n\n
\"Ischnura<\/a><\/figure>\n
Ischnura aurora femelle, Australie (NT), Lietchfield Camp Site, 15\/04\/2022
Ischnura aurora femelle, Australie (NT), Jasper Creek (Victoria River), 27\/04\/2022<\/figcaption><\/figure>\n\n\n\n

Ischnura (1) vient du grec ischnos<\/em> pour fin<\/em> ou mince<\/em> et de oura<\/em> qui signifie queue<\/em>. Charpentier explique qu’il a cr\u00e9\u00e9 ce nom en raison de la finesse exceptionnelle de l’abdomen (sans doute en comparaison du genre Calopteryx, d’apr\u00e8s Fliedner (2006), car elle n’a pour nous rien d’\u00e9tonnant en soi).
Aurora, du latin aurora<\/em> qui signifie aurore<\/em>. Mais Brauer met une majuscule \u00e0 Aurora impliquant qu’il a nomm\u00e9 l’esp\u00e8ce en s’inspirant de la D\u00e9esse de l’Aurore, D\u00e9esse qui en pleurant la mort de son fils Memnon donne la ros\u00e9e du matin. Mais il n’y a rien dans la description originale qui sugg\u00e8re les couleurs du lever du soleil. Il faut cependant rappeler que les scientifiques de l’\u00e9poque travaillaient sur des sujets en collection qui avaient souvent totalement chang\u00e9 de couleur…
<\/p>\n\n\n\n

\"Ischnura<\/a>
Ischnura aurora femelle, Australie (FNQ), Ravenshoe, 11\/12\/2022<\/figcaption><\/figure>\n\n\n\n
<\/div>\n\n\n\n

-1- The Naming of Australia’s Dragonflies<\/a>, Ian Endersby & Heinrich Fliedner, Busybird publishing.<\/p>\n\n\n\n

<\/div>\n\n\n\n
\n
Accueil Australie<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Ce n’est qu’assez r\u00e9cemment que la taxonomie de ce petit Ischnura aurora \u00e9t\u00e9 r\u00e9gl\u00e9e. Il y a quelques ann\u00e9es, on pensait que sa distribution s’\u00e9tendait depuis le Pakistan jusqu’en Australie ; ce n’\u00e9tait pas sans poser quelques probl\u00e8mes, car m\u00eame les amateurs comme moi s’\u00e9taient bien \u00e9tonn\u00e9es d’une variabilit\u00e9, en particulier, sur l’\u00e9tendue des taches […]<\/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":[684,689],"tags":[687,692],"class_list":["post-11807","post","type-post","status-publish","format-image","hentry","category-australie-nt","category-coenagrionidae-australie-nt","tag-australie","tag-coenagrionidae-australie","post_format-post-format-image"],"yoast_head":"\nIschnura aurora - 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