{"id":19117,"date":"2021-04-01T10:00:17","date_gmt":"2021-04-01T08:00:17","guid":{"rendered":"https:\/\/almanimal.com\/?p=19117"},"modified":"2021-04-01T10:00:18","modified_gmt":"2021-04-01T08:00:18","slug":"le-plus-grand-requin-lumineux-du-monde","status":"publish","type":"post","link":"https:\/\/almanimal.com\/fr\/curiosites\/le-plus-grand-requin-lumineux-du-monde\/","title":{"rendered":"Le plus grand requin lumineux du monde a \u00e9t\u00e9 d\u00e9couvert"},"content":{"rendered":"<p>Il y a quelques semaines, nous avons re\u00e7u la nouvelle que dans les eaux profondes (et tr\u00e8s sombres) de <strong>Nouvelle-Z\u00e9lande <\/strong>ils avaient d\u00e9couvert le <strong>le plus grand requin lumineux du monde<\/strong>. <strong>Il mesure 1,80 m\u00e8tre de long<\/strong> et brille dans le noir. Pourquoi ce requin brille-t-il ?<strong> Quelle est la luminosit\u00e9 ? <\/strong>Combien d\u2019esp\u00e8ces de requins sont capables d\u2019\u00e9mettre de la lumi\u00e8re ?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi le plus grand requin lumineux du monde brille-t-il ?<\/h2>\n\n\n\n<p>La r\u00e9ponse est la <strong><a href=\"https:\/\/almanimal.com\/fr\/curiosites\/bioluminescence-qui-est\/\">bioluminescence<\/a>.<\/strong> Ce processus complexe se produit gr\u00e2ce \u00e0 la <strong>enzyme lucif\u00e9rase<\/strong> qui, par une r\u00e9action chimique, am\u00e8ne les organismes vivants \u00e0 produire de la lumi\u00e8re. Comment se produit ce processus\u00a0? L&#039;oxyg\u00e8ne est responsable de l&#039;oxydation d&#039;une prot\u00e9ine appel\u00e9e<strong> lucif\u00e9rine;<\/strong> De son c\u00f4t\u00e9, la lucif\u00e9rase, qui est l\u2019enzyme qui participe \u00e0 ce ph\u00e9nom\u00e8ne, <strong>acc\u00e9l\u00e8re la r\u00e9action <\/strong>et l&#039;ATP (ad\u00e9nosine triphosphate) fournit l&#039;\u00e9nergie n\u00e9cessaire \u00e0 la r\u00e9action.<strong> l&#039;eau et la lumi\u00e8re sont produites,<\/strong> visible particuli\u00e8rement la nuit.<\/p>\n\n\n\n<p>Ce processus, qui <strong>convertit l&#039;\u00e9nergie chimique en \u00e9nergie lumineuse,<\/strong> Elle peut survenir au niveau des bact\u00e9ries, des champignons, des vers, des mollusques, des c\u00e9phalopodes et des crustac\u00e9s,<a href=\"https:\/\/almanimal.com\/fr\/aquariums\/comment-desinfecter-un-etang-a-poissons\/\"> poisson<\/a>, m\u00e9duses, etc. <strong>Et \u00e0 quoi sert la brillance ?<\/strong> Non seulement ce requin, d&#039;autres esp\u00e8ces ont cette caract\u00e9ristique particuli\u00e8re pour attirer leurs proies ou se d\u00e9fendre des pr\u00e9dateurs. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"790\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/tiburoncin.jpg.jpg\" alt=\"Ces requins \u00e9mettent une lumi\u00e8re pour chasser leurs proies et se cacher des pr\u00e9dateurs.\" class=\"wp-image-19126\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/tiburoncin.jpg.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/tiburoncin.jpg-300x237.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/tiburoncin.jpg-768x607.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<p>Dans le cas de la <strong>le plus grand requin lumineux du monde<\/strong>, la lumi\u00e8re qu&#039;elle \u00e9met sert \u00e0 <strong>m\u00e9thode de leurre<\/strong> pour attirer leurs proies et, curieusement, c&#039;est une qualit\u00e9 des poissons qui vivent dans des eaux tr\u00e8s profondes. Certaines esp\u00e8ces ont une <strong>appendice suspendu \u00e0 la t\u00eate, <\/strong>qui attire les petits poissons ; d&#039;autres, comme le requin, utilisent la bioluminescence pour <strong>cache tes fesses<\/strong> et laissent un app\u00e2t \u00e0 leurs proies\u00a0; elles s&#039;y laissent facilement prendre. Mais la bioluminescence n&#039;est pas r\u00e9serv\u00e9e aux organismes marins. Un cas tr\u00e8s courant est celui de <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/les-lucioles-sont-en-danger-dextinction\/\">lucioles<\/a>, qui l&#039;utilisent comme moyen de d\u00e9fense pour effrayer les chauves-souris : la lueur des lucioles repr\u00e9sente la toxicit\u00e9 et l&#039;empoisonnement. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c0 la d\u00e9couverte du plus grand requin lumineux du monde<\/h2>\n\n\n\n<p>Nous avons d\u00e9j\u00e0 mentionn\u00e9 que le processus par lequel diff\u00e9rents organismes produisent de l&#039;\u00e9nergie lumineuse est appel\u00e9 bioluminescence. Cependant, dans un <a href=\"https:\/\/www.frontiersin.org\/articles\/10.3389\/fmars.2021.633582\/full\" target=\"_blank\" rel=\"noreferrer noopener\">\u00e9tude publi\u00e9e dans<em> Fronti\u00e8res<\/em> <em>en sciences marines<\/em><\/a><strong><em> <\/em><\/strong><em>(Fronti\u00e8res des sciences marines)<\/em><strong><em> <\/em>Le cas des requins lumineux est particulier.<\/strong> Et ces requins sont capables de produire un <strong>lumi\u00e8re bleu-vert<\/strong> non seulement pour attirer leurs proies : ils le font comme <strong>contre-jour, apos\u00e9matisme<\/strong> y <strong>reconnaissance<\/strong> consp\u00e9cifique.<\/p>\n\n\n\n<p>Chez les requins, la bioluminescence est obtenue<strong> \u00e0 travers des photophores <\/strong>pr\u00e9sents dans l&#039;\u00e9piderme. Ces milliers de photophores sont compos\u00e9s d&#039;un <strong>couche de cellules pigment\u00e9es<\/strong> qui, \u00e0 leur tour, se maintiennent entre <strong>1 et plus de 12 photos.<\/strong> Apr\u00e8s cette \u00e9tude, il a \u00e9t\u00e9 conclu que la lueur des requins n&#039;\u00e9tait pas due \u00e0 des bact\u00e9ries lumineuses, et qu&#039;on n&#039;y avait pas trouv\u00e9 de lucif\u00e9rase ou de lucif\u00e9rine. Donc, en pratique, <strong>reste un myst\u00e8re <\/strong>la v\u00e9ritable cause de la luminosit\u00e9 de ces requins.<\/p>\n\n\n\n<p>Gr\u00e2ce \u00e0 cette recherche, il est confirm\u00e9, pour la premi\u00e8re fois, que<strong> trois esp\u00e8ces de requins,<\/strong> sur <em>Dalatias licha<\/em>les <em>Etmopterus lucifer<\/em> et le <em>Etmopterus granulosus,<\/em> sont capables de produire de la lumi\u00e8re visible par des r\u00e9actions chimiques. L&#039;auteur principal de l&#039;\u00e9tude, <strong>J\u00e9r\u00f4me Mallefet,<\/strong> Il a confirm\u00e9 que ces trois esp\u00e8ces brillaient d&#039;une lumi\u00e8re bleu-vert qui s&#039;assombrissait lentement. Il a \u00e9galement pr\u00e9cis\u00e9 qu&#039;en plus de chasser leurs proies ou de se prot\u00e9ger des pr\u00e9dateurs, elles accomplissaient \u00e9galement <strong>pour se reproduire ou lorsqu&#039;ils nagent en groupe.<\/strong><\/p>\n\n\n\n<p>Ils se connaissent <strong>540 esp\u00e8ces de requins<\/strong>jusqu&#039;\u00e0 pr\u00e9sent et, selon Mafellet,<strong> 57 d&#039;entre eux sont capables de produire cette lumi\u00e8re <\/strong>gr\u00e2ce \u00e0 la bioluminescence. Toutes ces esp\u00e8ces habiteraient la<strong> zone cr\u00e9pusculaire de l&#039;oc\u00e9an,<\/strong> Autrement dit, \u00e0 plus de 200 m\u00e8tres de profondeur, elles seraient de petite taille. Le chercheur souligne l&#039;importance de la bioluminescence chez ces esp\u00e8ces (en particulier \u00e0 ces profondeurs) pour structurer correctement l&#039;\u00e9cosyst\u00e8me.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c0 la chasse aux requins lumineux<\/h3>\n\n\n\n<p>Mafellet et son \u00e9quipe se sont lanc\u00e9s dans une exp\u00e9dition d&#039;un mois \u00e0 travers le <strong>eaux au large des c\u00f4tes de la Nouvelle-Z\u00e9lande. <\/strong>Au d\u00e9but, ils ont scrut\u00e9 l&#039;oc\u00e9an \u00e0 la recherche de <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/consequence-de-laugmentation-de-la-temperature-mondiale\/\">requins<\/a> qui ont pu survivre au changement de pression d\u00fb \u00e0 l&#039;absence de <strong>vessies natatoires. <\/strong>Les sp\u00e9cimens vivants ont \u00e9t\u00e9 plac\u00e9s dans des bassins, dans une pi\u00e8ce compl\u00e8tement sombre et froide. Une \u00e9quipe \u00e9tait alors charg\u00e9e de les photographier. Des \u00e9chantillons de peau ont \u00e9t\u00e9 pr\u00e9lev\u00e9s afin que les chercheurs puissent \u00e9tudier les organes lumineux des requins, qui, selon eux, ressemblaient \u00e0 des \u00e9cailles de requin. <strong>petites lanternes.<\/strong><\/p>\n\n\n\n<p>Ces requins ont <strong>organes bioluminescents de couleur bleu verd\u00e2tre sur le ventre. <\/strong>Cela les aide \u00e0 se fondre dans la lumi\u00e8re bleue et \u00e0 se cacher des pr\u00e9dateurs plus grands. \u00c0 leur tour, ils illuminent d&#039;autres esp\u00e8ces plus petites pour se nourrir. Il est int\u00e9ressant de noter que Mallefet appelle les requins qui brillent comme <strong>\u00abMacGyver de la lumi\u00e8re\u00bb.<\/strong><\/p>\n\n\n\n<p>Des \u00e9tudes sur les organes et la peau de ces requins ont d\u00e9termin\u00e9 que la lumi\u00e8re produite dans les organes de ces requins <strong>Ce n\u2019est pas d\u00fb au syst\u00e8me nerveux, mais \u00e0 l\u2019hormone m\u00e9latonine, <\/strong>responsable de la r\u00e9gulation de cette lumi\u00e8re. La m\u00e9latonine est responsable de<strong> \u00ab allume la lampe de poche \u00bb<\/strong><em> <\/em>des requins\u00a0: en fait, cela active la bioluminescence. \u00c0 l&#039;autre extr\u00e9mit\u00e9 de l&#039;\u00e9chelle, il y a aussi <strong>hormones responsables de son extinction.<\/strong> Bien qu\u2019il reste encore beaucoup \u00e0 d\u00e9couvrir : on ne sait toujours pas ce qui r\u00e9gule ces hormones.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1000\" height=\"933\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/luminoso.jpg.jpg\" alt=\"Le plus grand requin lumineux du monde mesure 1,80 m\u00e8tre\" class=\"wp-image-19125\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/luminoso.jpg.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/luminoso.jpg-300x280.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/03\/luminoso.jpg-768x717.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">1,80 m\u00e8tre de long<\/h3>\n\n\n\n<p>Des trois esp\u00e8ces \u00e9tudi\u00e9es par l\u2019exp\u00e9dition, la plus remarquable est la <em>Dalatias licha<\/em>, \u00e9galement appel\u00e9 <strong>Carocho <\/strong>et c&#039;est, curieusement, le<strong> le plus grand requin lumineux du monde, <\/strong>Jusqu&#039;\u00e0 pr\u00e9sent, les requins carocho vivent <strong>entre 200 et 1000 m\u00e8tres de profondeur dans l&#039;oc\u00e9an.<\/strong> Le Carocho a un corps long et \u00e9lanc\u00e9, une petite t\u00eate et un museau plut\u00f4t court et plat\u00a0; ses yeux sont grands et habitu\u00e9s \u00e0 l&#039;ombre\u00a0; ses nageoires et sa queue sont petites. Malgr\u00e9 sa petite taille, <strong>ses dimensions sont \u00e9normes<\/strong>.<\/p>\n\n\n\n<p>Les<strong> les dents sup\u00e9rieures sont petites et en forme de pointe<\/strong>Les m\u00e2choires inf\u00e9rieures sont larges et triangulaires. Ces m\u00e2choires redoutables lui permettent de d\u00e9chiqueter facilement ses proies. Le requin Carocho est <strong>gris fonc\u00e9 ou noir,<\/strong> et la grande surprise est que le sp\u00e9cimen trouv\u00e9 par l&#039;exp\u00e9dition <strong>Il mesure 1,80 m\u00e8tre.<\/strong> Un record si on le compare aux autres esp\u00e8ces bioluminescentes, qui n&#039;atteignent pas plus d&#039;un demi-m\u00e8tre de longueur.<\/p>\n\n\n\n<p>On imagine g\u00e9n\u00e9ralement les requins comme des animaux colossaux dot\u00e9s d&#039;\u00e9normes m\u00e2choires. Mais en r\u00e9alit\u00e9, <strong>Les deux tiers des diff\u00e9rentes esp\u00e8ces de requins atteignent \u00e0 peine un m\u00e8tre de longueur. <\/strong>Un requin 20% peut atteindre une longueur d&#039;environ un m\u00e8tre et demi. La grande majorit\u00e9 des grands requins vivent dans les profondeurs marines, l\u00e0 o\u00f9 nous ne pouvons m\u00eame pas nager. Et, entre autres, <strong>Vous ne verriez rien, car c&#039;est une zone totalement sombre. <\/strong>o\u00f9 la photosynth\u00e8se ne peut pas avoir lieu, par exemple. Par cons\u00e9quent, <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/importance-des-requins\/\">requins<\/a> Les esp\u00e8ces bioluminescentes (et autres esp\u00e8ces capables de briller) ont besoin de cette lumi\u00e8re pour chasser, attirer des proies, se d\u00e9fendre, se reproduire, etc.<\/p>\n\n\n\n<p>Bien que l\u2019\u00e9tude ait \u00e9t\u00e9 men\u00e9e dans les eaux n\u00e9o-z\u00e9landaises, le requin Carocho <strong>habite les eaux chaudes<\/strong> (toujours \u00e0 grande profondeur) et peut \u00eatre trouv\u00e9 dans le <strong>nord du golfe du Mexique,<\/strong> dans les \u00eeles britanniques, \u00e0 l&#039;ouest et au centre <strong>M\u00e9diterran\u00e9e ou les A\u00e7ores, <\/strong>pour ne citer que quelques exemples.<\/p>","protected":false},"excerpt":{"rendered":"<p>Le plus grand requin lumineux du monde a \u00e9t\u00e9 d\u00e9couvert dans les profondeurs des eaux n\u00e9o-z\u00e9landaises et mesure 1,80 m\u00e8tre de long.<\/p>","protected":false},"author":20,"featured_media":19127,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1430],"tags":[1468,1819,1820,2258,2076,2577,1825],"class_list":["post-19117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-curiosidades","tag-curiosidades-sobre-los-peces","tag-peces","tag-peces-agresivos","tag-peces-de-agua-caliente","tag-tiburon-luminoso","tag-tiburones"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Se ha descubierto el tibur\u00f3n luminoso m\u00e1s grande del mundo<\/title>\n<meta name=\"description\" content=\"El tibur\u00f3n luminoso m\u00e1s grande del mundo fue hallado en las profundidades de las aguas de Nueva Zelanda y mide 1,80 metros de longitud.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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