{"id":15258,"date":"2020-05-08T12:18:28","date_gmt":"2020-05-08T10:18:28","guid":{"rendered":"https:\/\/almanimal.com\/?p=15258"},"modified":"2020-05-08T12:20:25","modified_gmt":"2020-05-08T10:20:25","slug":"bioluminescence-qui-est","status":"publish","type":"post","link":"https:\/\/almanimal.com\/fr\/curiosites\/bioluminescence-qui-est\/","title":{"rendered":"Bioluminescence : qu&#039;est-ce que c&#039;est et \u00e0 quoi servent certains animaux ?"},"content":{"rendered":"<p>Vous avez s\u00fbrement vu de nombreux documentaires et vid\u00e9os d&#039;un ph\u00e9nom\u00e8ne tr\u00e8s frappant chez certaines esp\u00e8ces animales, qui semblent s&#039;illuminer<strong> Cr\u00e9er des sensations et des atmosph\u00e8res magiques. Mais ce n&#039;est pas du tout magique, m\u00eame si c&#039;est de la chimie.<\/strong>. C&#039;est le ph\u00e9nom\u00e8ne de <strong>bioluminescence<\/strong>Nous expliquons ce que c&#039;est et \u00e0 quoi certains animaux l&#039;utilisent.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Qu&#039;est-ce que la bioluminescence ?<\/h2>\n\n\n\n<p>Ce ph\u00e9nom\u00e8ne attrayant consiste en <strong>une source de lumi\u00e8re \u00e9mise par certains \u00eatres vivants<\/strong>, en particulier les insectes et de nombreux animaux marins, en r\u00e9ponse \u00e0 certaines <strong>situations et comme m\u00e9thode de survie.<\/strong> Cette conversion de l\u2019\u00e9nergie chimique en \u00e9nergie lumineuse est sans chaleur, c\u2019est-\u00e0-dire <strong>c&#039;est une lumi\u00e8re froide.<\/strong><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"625\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina-1000x625.jpg\" alt=\"bioluminescence des animaux marins\" class=\"wp-image-15265\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina-1000x625.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina-300x188.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina-768x480.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina-1536x960.jpg 1536w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-marina.jpg 1920w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<p>Le <strong>bioluminescence <\/strong>s&#039;\u00e9tend<strong> \u00e0 propos d&#039;un grand groupe d&#039;animaux terrestres<\/strong>, provenant d&#039;insectes tels que les lucioles, les champignons ou les vers, <strong>et chez la plupart des marins,<\/strong> en particulier chez les animaux qui se d\u00e9placent \u00e0 de grandes profondeurs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Comment fonctionne la bioluminescence chez les animaux ?<\/h3>\n\n\n\n<p>La lumi\u00e8re \u00e9mise d\u00e9pend grandement de l&#039;esp\u00e8ce dans laquelle elle est produite. Chez certaines esp\u00e8ces, elle est le r\u00e9sultat d&#039;une <strong>r\u00e9action biochimique impliquant une enzyme catalytique appel\u00e9e lucif\u00e9rase<\/strong>, qui acc\u00e9l\u00e8re l&#039;oxydation d&#039;une prot\u00e9ine, <strong>lucif\u00e9rine<\/strong>qui <strong>\u00e9met de la lumi\u00e8re<\/strong> quand il entre <strong>en contact avec l&#039;eau<\/strong>Chez d\u2019autres esp\u00e8ces, l\u2019\u00e9mission de lumi\u00e8re est g\u00e9n\u00e9r\u00e9e par<strong> ions du syst\u00e8me nerveux<\/strong>, qui contr\u00f4lent la luminosit\u00e9 et l&#039;intensit\u00e9 de la lumi\u00e8re et r\u00e9agissent aux facteurs externes.<\/p>\n\n\n\n<p>La lumi\u00e8re produite par une r\u00e9action chimique peut \u00eatre g\u00e9n\u00e9r\u00e9e dans<strong> cellules internes<\/strong> comme chez les crustac\u00e9s et, ces bioluminescences sont \u00e9galement log\u00e9es \u00e0 droite <strong>sous la peau et dans les nageoires<\/strong> comme le groupe des Anamalopidae auquel appartiennent les poissons-lanternes. Enfin, <strong>luminescence produite <\/strong>\u00e0 l&#039;int\u00e9rieur du corps mais par <strong>cellules sp\u00e9cialis\u00e9es \u00e0 cet effet<\/strong> et qu&#039;ils lib\u00e8rent comme instrument de d\u00e9fense contre leurs pr\u00e9dateurs.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1000\" height=\"566\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-1000x566.jpg\" alt=\"lucif\u00e9rine\" class=\"wp-image-15263\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-1000x566.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-300x170.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-768x435.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia-1536x869.jpg 1536w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/bioluminiscencia.jpg 1592w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<p>Ce ph\u00e9nom\u00e8ne lumineux a diverses fonctions au sein du monde animal qui le poss\u00e8de. Leur point commun est l&#039;aide qu&#039;il apporte. <strong>survivre<\/strong>, bien qu&#039;il soit \u00e9galement utilis\u00e9 comme <strong>syst\u00e8me d&#039;alimentation, <\/strong>comme <strong>app\u00e2t <\/strong>ou leurre attirant les petits animaux (la baudroie) ; pour <strong>race <\/strong>\u00e9mettant des flashs lumineux du m\u00e2le vers la femelle et vice versa (<a href=\"http:\/\/luciernagas\">les lucioles<\/a>) <strong>ou comme d\u00e9fense <\/strong>par distraction avec expulsion de mati\u00e8re luminescente (calmar). \u00c9galement pour <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/camouflage-animalier\/\">camouflage <\/a>certaines parties (requins) et attraper leurs proies.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Diff\u00e9rences entre les esp\u00e8ces bioluminescentes, fluorescentes et phosphorescentes<\/h3>\n\n\n\n<p>Comme nous l\u2019avons soulign\u00e9 pr\u00e9c\u00e9demment, <strong>Tous les animaux ne produisent pas le m\u00eame type de lumi\u00e8re<\/strong>Cela est d\u00fb \u00e0 la diff\u00e9rence entre la lucif\u00e9rine et la lucif\u00e9rase dans les diff\u00e9rents organes qui la produisent. De plus, en fonction de cette diff\u00e9rence, la lumi\u00e8re \u00e9mise acquiert<strong> diff\u00e9rentes nuances<\/strong>:bleu, verd\u00e2tre ou rouge, comme observ\u00e9 chez les m\u00e9duses qui vivent sur les fonds marins.<\/p>\n\n\n\n<p>Il existe plus d&#039;animaux \u00e9mettant de la lumi\u00e8re qu&#039;on ne le pensait auparavant. Cependant, toutes les \u00e9missions ne sont pas caus\u00e9es par la diff\u00e9rence entre les substances qui les composent. Elles peuvent plut\u00f4t \u00eatre produites par l&#039;absorption d&#039;\u00e9nergie puis son irradiation sous forme de lumi\u00e8re. Ces ph\u00e9nom\u00e8nes sont les suivants\u00a0: <strong>fluorescence et phosphorescence.<\/strong><\/p>\n\n\n\n<p>Le premier se caract\u00e9rise par l&#039;absorption du rayonnement ultraviolet magn\u00e9tique et l&#039;\u00e9mission ult\u00e9rieure de cette \u00e9nergie sous forme de lumi\u00e8re. L&#039;\u00e9nergie \u00e9mise est inf\u00e9rieure \u00e0 l&#039;\u00e9nergie accumul\u00e9e, et la diff\u00e9rence est dissip\u00e9e sous forme de chaleur.<strong>Le cycle complet de fluorescence (absorption, dissipation et \u00e9mission) est tr\u00e8s court.<\/strong>, presque instantan\u00e9.<\/p>\n\n\n\n<p>Le <strong>phosphorescence<\/strong>, quant \u00e0 elle, suit le m\u00eame m\u00e9canisme physique que la fluorescence qui r\u00e9git l&#039;absorption et le stockage. Mais la diff\u00e9rence r\u00e9side dans l&#039;\u00e9mission lumineuse\u00a0: l&#039;allumage est plus lent au fil du temps, se produisant parfois apr\u00e8s plusieurs heures.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1000\" height=\"666\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente-1000x666.jpg\" alt=\"m\u00e9duse\" class=\"wp-image-15261\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente-1000x666.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente-300x200.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente-768x512.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente-1536x1023.jpg 1536w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/05\/Medusa-bioluminiscente.jpg 1920w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Animaux utilisant la bioluminescence<\/h2>\n\n\n\n<p>Nombre des animaux que nous connaissons nous surprennent par ce processus complexe de bioluminescence, qui offre un spectacle merveilleux lorsqu&#039;on l&#039;observe. Parmi les plus connus, on trouve <strong>lucioles <\/strong>Parmi plus de 2\u00a0000 esp\u00e8ces, chaque groupe brille d&#039;une lumi\u00e8re vacillante diff\u00e9rente. Ils y parviennent gr\u00e2ce \u00e0<strong> un organe sp\u00e9cial et par des r\u00e9actions chimiques <\/strong>et dont la mission est l&#039;attraction sexuelle. <\/p>\n\n\n\n<p>Les <strong>poisson lanterne<\/strong> Il vit dans les profondeurs les plus profondes de la mer. Sa lumi\u00e8re est g\u00e9n\u00e9r\u00e9e par un organe situ\u00e9 sur sa t\u00eate, appel\u00e9 voile, qu&#039;il utilise comme leurre pour attirer ses proies. <\/p>\n\n\n\n<p>Le <strong>m\u00e9duse <\/strong>Ce sont les animaux marins bioluminescents classiques, et certaines de leurs vari\u00e9t\u00e9s \u00e9mettent des lumi\u00e8res vertes et bleues, qui avec le mouvement de leurs tentacules cr\u00e9ent un magnifique arc-en-ciel. <\/p>\n\n\n\n<p>Les<strong> calmar luciole<\/strong> C&#039;est une vari\u00e9t\u00e9 de calmar de tr\u00e8s petites dimensions, il \u00e9met une lumi\u00e8re bleue pour frayer une fois par an. <\/p>\n\n\n\n<p>Les <strong>plancton <\/strong>C&#039;est la nourriture d&#039;une grande majorit\u00e9 des animaux marins, et une vari\u00e9t\u00e9 d&#039;entre eux produit son pouvoir lumineux comme syst\u00e8me de d\u00e9fense, pour effrayer ses pr\u00e9dateurs. <\/p>\n\n\n\n<p>Les <strong>scorpions <\/strong>Ils ont des effets lumineux tr\u00e8s faibles voire quasi inexistants avant de muer ; la lumi\u00e8re augmente avec l&#039;\u00e2ge : plus ils sont \u00e2g\u00e9s, plus ils muent et plus la lumi\u00e8re \u00e9mise est puissante.<\/p>","protected":false},"excerpt":{"rendered":"<p>Seguro que has visto numerosos documentales y v\u00eddeos de un fen\u00f3meno muy vistoso en algunas especies de animales, que parecen encenderse creando sensaciones y ambientes m\u00e1gicos. Pero no tiene nada de magia, aunque s\u00ed de qu\u00edmica. Se trata del fen\u00f3meno de la bioluminiscencia. Os explicamos en qu\u00e9 consiste y para qu\u00e9 lo utilizan algunos animales. &#8230; <a title=\"Bioluminescence : qu&#039;est-ce que c&#039;est et \u00e0 quoi servent certains animaux ?\" class=\"read-more\" href=\"https:\/\/almanimal.com\/fr\/curiosites\/bioluminescence-qui-est\/\" aria-label=\"En savoir plus sur Bioluminiscencia \u00bfQu\u00e9 es y para qu\u00e9 la utilizan algunos animales?\">Lire la suite<\/a><\/p>","protected":false},"author":20,"featured_media":15260,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1430],"tags":[1974,1468,1819,1893,1666],"class_list":["post-15258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-bioluminiscencia","tag-curiosidades","tag-curiosidades-sobre-los-peces","tag-luciernagas","tag-medusas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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