{"id":5061,"date":"2020-03-05T08:18:04","date_gmt":"2020-03-05T07:18:04","guid":{"rendered":"http:\/\/www.meslibellules.fr\/blog\/?p=5061"},"modified":"2026-07-02T07:59:22","modified_gmt":"2026-07-02T05:59:22","slug":"odonates-pieges-par-setaria-verticillata","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2020\/03\/05\/odonates-pieges-par-setaria-verticillata\/","title":{"rendered":"Namibie - Odonates pi\u00e9g\u00e9s par Setaria verticillata"},"content":{"rendered":"\n
\"Orthetrum<\/a>
Orthetrum sp. m\u00e2le pi\u00e9g\u00e9e par Setaria verticillata, Namibie, au pied du Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Odonates pi\u00e9g\u00e9s par Setaria verticillata<\/span><\/span><\/h3>\n\n\n\n

Le 9 f\u00e9vrier 2020 au matin, lorsque j'ai d\u00e9couvert cet Orthetrum sur cette herbe, j'ai pens\u00e9 qu'il \u00e9tait simplement curieusement pos\u00e9, mais au bout de quelques secondes, en l'absence de mouvement, j'ai r\u00e9alis\u00e9 qu'il \u00e9tait mort. Si on trouve couramment des libellules mortes dans les toiles d'araign\u00e9es ou m\u00eame sur le sol, il est \u00e0 ma connaissance tr\u00e8s rare de les trouver pos\u00e9es sur un v\u00e9g\u00e9tal.
Ci-dessous ce bouquet d'herbe d'environ 1 m 20 de haut.
<\/p>\n\n\n\n

\"Setaria<\/a>
Setaria verticillata, Namibie, au pied Waterberg du Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Mais cet Orthetrum \u00e9tait loin d'\u00eatre le seul sur cette plante ; ci-dessous \u00e0 gauche, Orthetrum abotti femelle, \u00e0 droite un m\u00e2le Pantala flavescens (m\u00eame localisation, m\u00eame date) :<\/p>\n\n\n\n

\n
\"Orthetrum<\/a>
Orthetrum abotti femelle pi\u00e9g\u00e9e par Setaria verticillata, Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n
\"Pantala<\/a>
Pantala flavescens pi\u00e9g\u00e9e par Setaria verticillata, Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n
Orthetrum abotti \u00e0 gauche, Pantala flavescens \u00e0 droite, pi\u00e9g\u00e9e par Setaria verticillata, Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

J'ai essay\u00e9 de lib\u00e9rer ces libellules (mortes) mais il s'est av\u00e9r\u00e9 impossible de le faire sans d\u00e9chirer leurs ailes ou briser leur abdomen, ce qui t\u00e9moignait d'une part de la qualit\u00e9 de la capture et d'autre part que leur mort n'\u00e9tait pas toute r\u00e9cente. Sans doute pas tr\u00e8s ancienne non plus, il faut faire confiance au soleil de cette r\u00e9gion (34 \u00b0C dans la journ\u00e9e) pour rapidement dess\u00e9cher ce qui est expos\u00e9 au soleil et au vent.
Cette inflorescence n'est pas collante, mais lorsque l'on passe la pulpe des doigts dessus, on sent une r\u00e9sistance pour les en enlever, comme si de minuscules crochets s'agrippaient aux sillons digitaux (qui forment les empreintes digitales).
Et en effet les cils (2 \u00e0 8 mm de long) portent de minuscules crochets ou retorses (environ 0,1 mm de long) que j'ai eu du mal \u00e0 mettre en \u00e9vidence avec seulement mon 150 mm Macro (photos faites sur le terrain), mais la photo de droite est explicite (clic sur la photo !).
<\/p>\n\n\n\n

\n
\"Setaria<\/a><\/figure>\n\n\n\n
\"Setaria<\/a><\/figure>\n
Setaria verticillata, Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Ce n'\u00e9tait que ma premi\u00e8re rencontre avec cette esp\u00e8ce commune en Namibie ; j'ai pu appr\u00e9cier tout son charme plus tard, \u00e0 plusieurs reprises, lorsque j'ai pass\u00e9 des dizaines de minutes \u00e0 enlever ces cils agripp\u00e9s au tissu de mon pantalon : soit par inflorescences enti\u00e8res, soit simplement par filaments qu'il faut saisir entre les ongles tellement ils sont fins et courts. Le syst\u00e8me d'accrochage est tellement puissant que les fibres du tissu sont parfois arrach\u00e9es lors du retrait, ce qui explique pourquoi les insectes captur\u00e9s ne peuvent en r\u00e9chapper.
Ces minuscules crochets ont \u00e9galement tendance \u00e0 irriter la peau par frottement.<\/p>\n\n\n\n

\"Crocothemis<\/a>
Crocothemis sanguinolenta femelle pi\u00e9g\u00e9e par Setaria verticillata, Namibie, Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Setaria verticillata est une plante herbac\u00e9e annuelle de la famille des Poaceae ; ce n'est pas une plante carnivore :). Les libellules et d'autres insectes (j'ai aper\u00e7u quelques dipt\u00e8res et hym\u00e9nopt\u00e8res) sont en quelque sorte des victimes collat\u00e9rales de l'excellent moyen de dispersion des graines de cette plante. \u00c0 coup s\u00fbr nous en avons tous rapport\u00e9 dans nos contr\u00e9es respectives, o\u00f9 elle est d'ailleurs certainement d\u00e9j\u00e0 implant\u00e9e puisqu'elle est maintenant r\u00e9pandue dans de nombreuses r\u00e9gions temp\u00e9r\u00e9es et tropicales du monde (pr\u00e9sente en France sous le nom de S\u00e9taire verticill\u00e9e).<\/p>\n\n\n\n

\"Orthetrum<\/a>
Orthetrum sp. m\u00e2le pi\u00e9g\u00e9 par Setaria verticillata, Namibie, au pied du Waterberg Plateau National Park, 09\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Elle est consid\u00e9r\u00e9e comme une \"mauvaise herbe\" des cultures et des p\u00e2tures o\u00f9 elle se fait un plaisir de s'accrocher au pelage du b\u00e9tail et se rencontre fr\u00e9quemment dans les milieux perturb\u00e9s (champs, d\u00e9combres, vignes).<\/p>\n\n\n\n

\"\"<\/a>
Ceriagrion glabrum (?) femelle, Namibie, Rundu, 10\/02\/2020<\/figcaption><\/figure>\n\n\n\n

Samways (1991) relate deux cas d'odonates pris au pi\u00e8ge de deux plantes diff\u00e9rentes, en Afrique du Sud.<\/p>\n\n\n\n

<\/div>\n\n\n\n

M.J. Samways. (1991). Dragonfly death by entanglement on hooked and barbed plant surfaces (Anisoptera: Libellulidae)<\/a>.\u00a0Odonatologica<\/em>,\u00a020<\/em>(1), 79\u201383.<\/p>\n\n\n\n\n\n

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

Odonates pi\u00e9g\u00e9s par Setaria verticillata Le 9 f\u00e9vrier 2020 au matin, lorsque j'ai d\u00e9couvert cet Orthetrum sur cette herbe, j'ai pens\u00e9 qu'il \u00e9tait simplement curieusement pos\u00e9, mais au bout de quelques secondes, en l'absence de mouvement, j'ai r\u00e9alis\u00e9 qu'il \u00e9tait mort. Si on trouve couramment des libellules mortes dans les toiles d'araign\u00e9es ou m\u00eame sur […]<\/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":[274],"tags":[294,293],"class_list":["post-5061","post","type-post","status-publish","format-image","hentry","category-namibie","tag-odonates-captures-par-setaria-verticillata","tag-odonates-trapped-by-setaria-verticillata","post_format-post-format-image"],"yoast_head":"\nOdonates pi\u00e9g\u00e9s par Setaria verticillata - 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