{"id":25024,"date":"2025-06-02T14:03:40","date_gmt":"2025-06-02T12:03:40","guid":{"rendered":"https:\/\/www.meslibellules.fr\/blog\/?p=25024"},"modified":"2025-10-31T12:28:33","modified_gmt":"2025-10-31T11:28:33","slug":"cannibalisme-chez-ischnura-elegans","status":"publish","type":"post","link":"https:\/\/www.meslibellules.fr\/blog\/2025\/06\/02\/cannibalisme-chez-ischnura-elegans\/","title":{"rendered":"Cannibalisme chez Ischnura elegans"},"content":{"rendered":"\n<p>Le cannibalisme chez Ischnura elegans est curieusement une occurrence <em>presque commune<\/em> parmi les cas de cannibalisme des Odonates ; en effet, cette esp\u00e8ce repr\u00e9sente \u00e0 ce jour 20% des cas de cannibalismes document\u00e9s chez les zygopt\u00e8res ! Cette observation est la vint-troisi\u00e8me.<br>Cela reste bien s\u00fbr un ph\u00e9nom\u00e8ne rare et j&rsquo;ai entrepris une longue <a href=\"https:\/\/www.meslibellules.fr\/blog\/2024\/05\/20\/cannibalisme-des-zygopteres\/\">recherche sur ce sujet<\/a> dans laquelle j&rsquo;ai tent\u00e9 de recenser tous les cas de fa\u00e7on exhaustive (111 cas). Il y a plusieurs hypoth\u00e8ses pour expliquer ce curieux ph\u00e9nom\u00e8ne qui va \u00e0 l&rsquo;encontre de l&rsquo;int\u00e9r\u00eat d&rsquo;une esp\u00e8ce et dont les causes sont sans doute multifactorielles.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-1.webp\"><img decoding=\"async\" width=\"1223\" height=\"1504\" data-id=\"25014\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-1.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25014 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-1.webp 1223w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-1-768x944.webp 768w\" data-sizes=\"(max-width: 1223px) 100vw, 1223px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1223px; --smush-placeholder-aspect-ratio: 1223\/1504;\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-2.webp\"><img decoding=\"async\" width=\"1386\" height=\"1504\" data-id=\"25015\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-2.webp\" alt=\"Agrion \u00e9l\u00e9gant cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25015 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-2.webp 1386w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-2-768x833.webp 768w\" data-sizes=\"(max-width: 1386px) 100vw, 1386px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1386px; --smush-placeholder-aspect-ratio: 1386\/1504;\" \/><\/a><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">Ischnura elegans cannibalisme \u2640 x \u2642 tr\u00e8s jeune, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:01:05 &amp; 15:01:21<\/figcaption><\/figure>\n\n\n\n<p>Ce 30 mai 2025, sur les berges de l&rsquo;<em>\u00c9tang du bois de Ham<\/em> (Maine-et-Loire), il n&rsquo;y a pas de vent, il fait 31\u00b0C.<br>En venant sur ce site, j&rsquo;ai tout de m\u00eame une arri\u00e8re-pens\u00e9e, car je sais que la rive nord-est, en pente douce, est envahie d&rsquo;iris des marais et de joncs qui abritent toujours \u00e9norm\u00e9ment d&rsquo;Ischnura elegans&#8230; Mais c&rsquo;est un site que je connais bien, que j&rsquo;ai souvent explor\u00e9, sans jamais avoir eu la chance de faire de photos de pr\u00e9dation.<br>En m&rsquo;avan\u00e7ant dans la v\u00e9g\u00e9tation, je d\u00e9range de nombreux sujets tr\u00e8s jeunes, jeunes ou matures qui s&rsquo;\u00e9cartent et se reposent \u00e0 proximit\u00e9, essentiellement I. elegans et P. pennipes, mais aussi quelques E. cyathigerum et P. acutipennis. Trois Libellula fulva, seuls anisopt\u00e8res, se disputent cet espace assez restreint en me fr\u00f4lant par moment.<br>\u00c0 15 heures exactement, un zygopt\u00e8re tr\u00e8s sombre que je d\u00e9range sans doute, s&rsquo;\u00e9l\u00e8ve mollement et est aussit\u00f4t saisi par un autre, tous les deux tombent \u00e0 un m\u00e8tre de moi, entre des iris, dans les herbes. <br>Les premi\u00e8res photos ci-dessus, me font battre le c\u0153ur plus vite, car dans mon viseur (num\u00e9rique&#8230;), j&rsquo;ai bien l&rsquo;impression que ce sont 2 Ischnura elegans ; \u00e0 cet instant, je ne suis tout de m\u00eame pas certain que ce ne soit pas une tentative d&rsquo;accouplement. <br>Mais la couleur de l&rsquo;agresseur (?) \u00e9limine finalement un m\u00e2le qui n&rsquo;aurait jamais cette teinte de bleu. Il est alors 15:03:25.<\/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\/Ischnura-elegans-cannibalisme-3.webp\"><img decoding=\"async\" width=\"1876\" height=\"1504\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-3.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25016 lazyload\" style=\"--smush-placeholder-width: 1876px; --smush-placeholder-aspect-ratio: 1876\/1504;width:522px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-3.webp 1876w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-3-768x616.webp 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-3-1536x1231.webp 1536w\" data-sizes=\"(max-width: 1876px) 100vw, 1876px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Cannibalisme chez Ischnura elegans \u2640 x \u2642 tr\u00e8s jeune, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:03:25<\/figcaption><\/figure>\n\n\n\n<p>Les deux sujets combattent, en luttant, ils tombent et se rapprochent du sol, je fais de nombreuses photos sans int\u00e9r\u00eat, toujours g\u00ean\u00e9 par la v\u00e9g\u00e9tation qui s&rsquo;interpose, mais qui me permettent d&rsquo;avoir la certitude qu&rsquo;une jeune femelle I. elegans mature agresse un tr\u00e8s jeune m\u00e2le de la m\u00eame esp\u00e8ce.<br>Si j&rsquo;ai dout\u00e9 d&rsquo;assister \u00e0 une sc\u00e8ne de cannibalisme, c&rsquo;est que dans l&rsquo;immense majorit\u00e9 des cas, la pr\u00e9datrice (dans 70% des cas, c&rsquo;est en effet une femelle) commence son repas par la t\u00eate et les yeux. Cette fa\u00e7on de s&rsquo;attaquer au thorax me paraissait inhabituelle par rapport au nombreux cas que j&rsquo;ai enregistr\u00e9s.<br>Mais les deux photos ci-dessous m&rsquo;enl\u00e8vent tout doute : une jeune femelle, plus vraiment une immature du type<em> violacea<\/em>, mais pas encore mature et androchrome, est en train de manger l&rsquo;abdomen d&rsquo;un tr\u00e8s jeune m\u00e2le de la m\u00eame esp\u00e8ce.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-4.webp\"><img decoding=\"async\" width=\"1595\" height=\"1504\" data-id=\"25017\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-4.webp\" alt=\"Pr\u00e9dation intrasp\u00e9cifique pour Agrion \u00e9l\u00e9gant \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25017 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-4.webp 1595w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-4-768x724.webp 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-4-1536x1448.webp 1536w\" data-sizes=\"(max-width: 1595px) 100vw, 1595px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1595px; --smush-placeholder-aspect-ratio: 1595\/1504;\" \/><\/a><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-5.webp\"><img decoding=\"async\" width=\"1440\" height=\"1504\" data-id=\"25018\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-5.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25018 lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-5.webp 1440w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-5-768x802.webp 768w\" data-sizes=\"(max-width: 1440px) 100vw, 1440px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1440px; --smush-placeholder-aspect-ratio: 1440\/1504;\" \/><\/a><\/figure>\n<figcaption class=\"blocks-gallery-caption wp-element-caption\">Ischnura elegans cannibalisme \u2640 x \u2642 tr\u00e8s jeune, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:04:55 &amp; 15:05:27<\/figcaption><\/figure>\n\n\n\n<p>Quelques secondes plus tard, l&rsquo;abdomen est sectionn\u00e9. La pr\u00e9datrice s&rsquo;envole pour se reposer avec le reste de sa proie \u00e0 un m\u00e8tre cinquante. J&rsquo;ai pris la pr\u00e9caution de bien rep\u00e9rer o\u00f9 \u00e9tait rest\u00e9e la victime avant de me d\u00e9placer pour faire la photo ci-dessous et quelques autres. Je ne pourrais pas suivre la pr\u00e9datrice plus longtemps, car quelques secondes apr\u00e8s ce clich\u00e9, elle a \u00e9t\u00e9 percut\u00e9e (m&rsquo;a-t-il sembl\u00e9)  ou intimid\u00e9e, en tout cas, par un autre Ischnura elegans (m\u00e2le ou femelle ?) et s&rsquo;est envol\u00e9e avec son repas.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-7.webp\"><img decoding=\"async\" width=\"1274\" height=\"1504\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-7.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25020 lazyload\" style=\"--smush-placeholder-width: 1274px; --smush-placeholder-aspect-ratio: 1274\/1504;width:353px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-7.webp 1274w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-7-768x907.webp 768w\" data-sizes=\"(max-width: 1274px) 100vw, 1274px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Ischnura elegans cannibalisme \u2640 x \u2642tr\u00e8es jeune, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:07:13<\/figcaption><\/figure>\n\n\n\n<div style=\"height:22px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-8.webp\"><img decoding=\"async\" width=\"1518\" height=\"1504\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-8.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25021 size-full lazyload\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-8.webp 1518w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-8-768x761.webp 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-8-150x150.webp 150w\" data-sizes=\"(max-width: 1518px) 100vw, 1518px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1518px; --smush-placeholder-aspect-ratio: 1518\/1504;\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\">\n<p>Je suis retourn\u00e9 aussit\u00f4t vers la victime. Rest\u00e9e sur le m\u00eame support, elle avait simplement gliss\u00e9 \u00e0 peine plus bas. <br>Pour faire quelques photos, j&rsquo;ai d\u00e9gag\u00e9 les herbes devant elle, et au bout d&rsquo;une minute peut-\u00eatre, j&rsquo;ai eu la surprise de voir qu&rsquo;elle \u00e9tait encore bien vivante bougeant maladroitement une puis deux pattes ; puis,  j&rsquo;ai \u00e9t\u00e9  vraiment sid\u00e9r\u00e9 de voir ce petit m\u00e2le tourner autour de son support, pour le placer entre lui et moi et se cacher derri\u00e8re, un comportement classique de protection des \u00e9mergents !<\/p>\n\n\n\n<p><span style=\"font-size: 10pt;\">Ischnura elegans cannibalisme \u2640 x \u2642 tr\u00e8s jeune, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:09:01<\/span><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:24px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Je l&rsquo;ai tr\u00e8s d\u00e9licatement attrap\u00e9 pour l&rsquo;examiner, intrigu\u00e9 du temps que la pr\u00e9datrice avait pass\u00e9 \u00e0 s&rsquo;int\u00e9resser au thorax, le c\u00f4t\u00e9 que je pouvais observer ne portant pas de dommages. Je l&rsquo;ai d\u00e9pos\u00e9 sur une feuille et j&rsquo;ai constat\u00e9 une plaie b\u00e9ante sur le c\u00f4t\u00e9 gauche de son thorax, l\u00e0 o\u00f9 la femelle s&rsquo;\u00e9tait acharn\u00e9e&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-9.webp\"><img decoding=\"async\" width=\"1987\" height=\"1504\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-9.webp\" alt=\"Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025\" class=\"wp-image-25022 lazyload\" style=\"--smush-placeholder-width: 1987px; --smush-placeholder-aspect-ratio: 1987\/1504;width:537px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-9.webp 1987w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-9-768x581.webp 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-9-1536x1163.webp 1536w\" data-sizes=\"(max-width: 1987px) 100vw, 1987px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:13:51<\/figcaption><\/figure>\n\n\n\n<p>Il faut remarquer que malgr\u00e9 le fait qu&rsquo;il ait perdu son abdomen, que le thorax soit largement ouvert et qu&rsquo;il lui manque trois, l&rsquo;insecte est vivant et adopte une posture classique d&rsquo;un zygopt\u00e8re pos\u00e9. Il est bien s\u00fbr condamn\u00e9, et apr\u00e8s quelques h\u00e9sitations, je l&rsquo;ai plac\u00e9 \u00e0 l&rsquo;abri dans une touffe d&rsquo;iris, cramponn\u00e9 \u00e0 une feuille. Je suis repass\u00e9 une demi-heure plus tard, il \u00e9tait toujours vivant, un peu plus haut dans la v\u00e9g\u00e9tation&#8230;<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><a href=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10.webp\"><img decoding=\"async\" width=\"2456\" height=\"1504\" data-src=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10.webp\" alt=\"Cannibalism in Blue-tailed damselfly \u2640 x \u2642 emergent, &quot;Bois de Ham&quot; pond (F-49), 05\/30\/2025\" class=\"wp-image-25023 lazyload\" style=\"--smush-placeholder-width: 2456px; --smush-placeholder-aspect-ratio: 2456\/1504;width:714px;height:auto\" data-srcset=\"https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10.webp 2456w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10-768x470.webp 768w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10-1536x941.webp 1536w, https:\/\/www.meslibellules.fr\/blog\/wp-content\/uploads\/Ischnura-elegans-cannibalisme-10-2048x1254.webp 2048w\" data-sizes=\"(max-width: 2456px) 100vw, 2456px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/a><figcaption class=\"wp-element-caption\">Ischnura elegans cannibalisme \u2640 x \u2642 \u00e9mergent, \u00e9tang du bois de Ham (F-49), 30\/05\/2025 &#8211; 15:16:54<\/figcaption><\/figure>\n\n\n\n<p>C&rsquo;est la troisi\u00e8me fois que j&rsquo;observe ce genre de comportement, apr\u00e8s un cas de cannibalisme entre <a href=\"https:\/\/www.meslibellules.fr\/blog\/2020\/02\/27\/ischnura-senegalensis\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ischnura senegalensis<\/a>, en Namibie et une autre en Australie, entre <a href=\"https:\/\/www.meslibellules.fr\/blog\/2022\/11\/15\/ischnura-heterosticta-cannibalisme\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ischnura heterosticta<\/a>. <br>Il est tr\u00e8s vraisemblable que le cannibalisme chez Ischnura elegans comme pour les autres zygopt\u00e8res r\u00e9sulte d<em>&lsquo;un probl\u00e8me de communication<\/em> ; pourquoi l&rsquo;agresseur ne comprend-il pas qu&rsquo;il agresse un membre de sa propre esp\u00e8ce ? On constate, pour les zygopt\u00e8res au moins, que les victimes (m\u00e2les, dans la plupart des cas) sont \u00e9mergents, immatures ou tr\u00e8s jeunes. Sans doute ne sont-ils pas capables d&rsquo;\u00e9mettre les signaux d&rsquo;avertissement qui les feraient reconna\u00eetre&#8230; C\u2019est  ce que sugg\u00e8re Utzeri, 1980 (1).<br>Un facteur concomitant est vraisemblablement la forte densit\u00e9 d&rsquo;individus pr\u00e9sents sur le m\u00eame site.<br><br>Plus de d\u00e9tails sur la page consacr\u00e9e au <a href=\"https:\/\/www.meslibellules.fr\/blog\/2024\/05\/20\/cannibalisme-des-zygopteres\/\">Cannibalisme parmi les zygopt\u00e8res<\/a>.<\/p>\n\n\n\n<div style=\"height:31px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"font-size:13px\">1- C. Utzeri,&nbsp;<a href=\"https:\/\/natuurtijdschriften.nl\/pub\/593245\/NOIOS1980001006003.pdf\"><em>Considerations on cannibalism in Zygoptera<\/em><\/a>, Notul. odonatol., Vol. I, No. 6, pp. 97-112, December I, 1980.<\/p>\n\n\n\n<div style=\"height:29px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-buttons is-layout-flex 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\/blog\/ischnura-elegans-3\/\">Accueil Ischnura elegans<\/a><\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le cannibalisme chez Ischnura elegans est curieusement une occurrence presque commune parmi les cas de cannibalisme des Odonates ; en effet, cette esp\u00e8ce repr\u00e9sente \u00e0 ce jour 20% des cas de cannibalismes document\u00e9s chez les zygopt\u00e8res ! Cette observation est la vint-troisi\u00e8me.Cela reste bien s\u00fbr un ph\u00e9nom\u00e8ne rare et j&rsquo;ai entrepris une longue recherche sur [&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":[60,55,61,646,676,362],"tags":[720,38626],"class_list":["post-25024","post","type-post","status-publish","format-image","hentry","category-coenagrionidae-france","category-france","category-ischnura-elegans","category-predation-entre-odonates","category-predation-par-odonates","category-predation-sur-odonates","tag-cannibalisme","tag-cannibalisme-zygopteres","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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