{"id":19661,"date":"2021-05-17T17:52:18","date_gmt":"2021-05-17T15:52:18","guid":{"rendered":"https:\/\/almanimal.com\/?p=19661"},"modified":"2021-05-17T17:54:13","modified_gmt":"2021-05-17T15:54:13","slug":"combien-de-coeurs-possede-une-pieuvre","status":"publish","type":"post","link":"https:\/\/almanimal.com\/fr\/curiosites\/combien-de-coeurs-possede-une-pieuvre\/","title":{"rendered":"Combien de c\u0153urs poss\u00e8de une pieuvre et autres curiosit\u00e9s sur cet animal"},"content":{"rendered":"<p>Les pieuvres, ces c\u00e9phalopodes intelligents mais \u00e9tranges, semblent incarner tout ce qui est effrayant et myst\u00e9rieux dans la mer\u00a0: l&#039;id\u00e9e de leurs corps mous tapis dans les recoins sombres des oc\u00e9ans a inspir\u00e9 des monstres l\u00e9gendaires, du Kraken au Lusca, le monstre mangeur d&#039;hommes des Bahamas. Leurs formes surnaturelles, sublim\u00e9es par leurs bras tendus, en font un<strong>Des animaux myst\u00e9rieux qui \u00e9veillent notre curiosit\u00e9 quant \u00e0 leur anatomie<\/strong>Vous voulez savoir combien de c\u0153urs poss\u00e8de une pieuvre et d\u00e9couvrir d&#039;autres anecdotes int\u00e9ressantes sur cet animal\u00a0? Cet article vous en dit plus.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Combien de c\u0153urs poss\u00e8de une pieuvre ?<\/h2>\n\n\n\n<p>Lorsque nous parlons de cr\u00e9atures marines, le <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/les-poulpes-les-animaux-les-plus-intelligents\/\">pieuvre<\/a> Il a un r\u00f4le fondamental, et son anatomie \u00e9nigmatique est assez curieuse : son syst\u00e8me de <strong>jets d&#039;encre<\/strong>, <strong>un bec d&#039;oiseau et huit tentacules avec leurs doubles rang\u00e9es de ventouses<\/strong>Ce que l\u2019on sait moins, c\u2019est que les pieuvres <strong>Ils ont plus d&#039;un c\u0153ur. Ils en ont trois.<\/strong>, pour \u00eatre exact, chacun d&#039;entre eux est crucial pour <strong>maintenir la pression art\u00e9rielle <\/strong>ce qui permet aux pieuvres d&#039;\u00eatre des chasseurs actifs et de puissants nageurs.<\/p>\n\n\n\n<p>Le c\u0153ur humain a deux fonctions principales\u00a0: pomper le sang vers les poumons, o\u00f9 il lib\u00e8re du dioxyde de carbone et s&#039;approvisionne en oxyg\u00e8ne\u00a0; distribuer le sang fra\u00eechement oxyg\u00e9n\u00e9 au reste du corps. Assurer un apport suffisant de sang aux poumons est si important que deux des quatre cavit\u00e9s du c\u0153ur humain sont exclusivement r\u00e9serv\u00e9es \u00e0 cette fonction.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-pulpo-1000x563.jpg\" alt=\"curiosit\u00e9s sur les poulpes\" class=\"wp-image-19709\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-pulpo-1000x563.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-pulpo-300x169.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-pulpo-768x432.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-pulpo.jpg 1191w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<p>Les c\u0153urs de poulpe r\u00e9solvent le probl\u00e8me de circulation d&#039;une mani\u00e8re diff\u00e9rente. Ils poss\u00e8dent un c\u0153ur principal, appel\u00e9 <strong>c\u0153ur syst\u00e9mique et deux c\u0153urs plus petits situ\u00e9s pr\u00e8s de ses branchies<\/strong>Les deux plus petits c\u0153urs <strong>Ils effectuent la m\u00eame t\u00e2che que le c\u00f4t\u00e9 droit du c\u0153ur humain<\/strong>: pompent le sang vers les branchies o\u00f9 il \u00e9limine les d\u00e9chets et se charge en oxyg\u00e8ne, puis renvoient le sang riche en oxyg\u00e8ne vers le c\u0153ur principal. Ensuite, le <strong>le c\u0153ur principal pompe le sang renouvel\u00e9 \u00e0 travers le corps de la pieuvre<\/strong>.<\/p>\n\n\n\n<p>Outre ses trois c\u0153urs, le syst\u00e8me circulatoire de la pieuvre diff\u00e8re sensiblement de celui de l&#039;humain. Le sang humain contient de l&#039;h\u00e9moglobine, une prot\u00e9ine qui lui permet d&#039;absorber l&#039;oxyg\u00e8ne et d&#039;acqu\u00e9rir sa couleur rouge. <strong>Le sang qui coule dans les trois c\u0153urs de la pieuvre est bleu<\/strong>, en raison d&#039;une prot\u00e9ine diff\u00e9rente appel\u00e9e <strong>h\u00e9mocyanine<\/strong>.<\/p>\n\n\n\n<p>En plus d&#039;apprendre combien de c\u0153urs poss\u00e8de une pieuvre, nous voulons vous expliquer d&#039;autres faits int\u00e9ressants sur cet animal que vous ne connaissiez probablement pas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Curiosit\u00e9s sur les pieuvres<\/h2>\n\n\n\n<p>Largement \u00e9tudi\u00e9 dans la science moderne, ses innombrables qualit\u00e9s vont de <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/les-animaux-les-plus-intelligents-du-monde\/\">intelligence brillante<\/a> jusqu&#039;\u00e0 ce que le <strong>r\u00e9g\u00e9n\u00e9ration des tentacules \u00e0 volont\u00e9<\/strong>Pour ces raisons et d\u2019autres, les pieuvres sont l\u2019un des plus grands miracles de la nature et les animaux les plus int\u00e9ressants de tout laboratoire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L&#039;une des esp\u00e8ces les plus anciennes<\/h3>\n\n\n\n<p>Les <strong>le plus ancien fossile de poulpe<\/strong> connu appartient \u00e0 un animal qui a v\u00e9cu il y a quelques ann\u00e9es <strong>296 millions d&#039;ann\u00e9es<\/strong>, durant la p\u00e9riode carbonif\u00e8re. Ce sp\u00e9cimen appartient \u00e0 une esp\u00e8ce appel\u00e9e <em>Pohls\u00e9pia <\/em>et est expos\u00e9 au Field Museum de Chicago. La journaliste Katherine Harmon Courage le d\u00e9crit comme un \u00ab symbole globulaire \u00bb, et son examen anatomique a r\u00e9v\u00e9l\u00e9 huit bras et deux yeux. <\/p>\n\n\n\n<p>Les chercheurs pensent qu&#039;il pourrait \u00e9galement contenir une poche d&#039;encre. Autrement dit, <strong>bien avant que la vie sur Terre n&#039;ait \u00e9volu\u00e9 au-del\u00e0 des faibles reptiles qui ont pr\u00e9c\u00e9d\u00e9 les dinosaures<\/strong>, les pieuvres avaient d\u00e9j\u00e0 leur anatomie structur\u00e9e pour les millions d&#039;ann\u00e9es \u00e0 venir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ses bras ont leur propre esprit<\/h3>\n\n\n\n<p>Les bras des pieuvres ont leur propre esprit. <strong>Les deux tiers des neurones d&#039;une pieuvre r\u00e9sident dans ses bras.<\/strong>, et non sa t\u00eate. Ainsi, ses bras peuvent ouvrir un coquillage pendant que la pieuvre est occup\u00e9e \u00e0 autre chose, comme chercher de la nourriture dans une grotte. <\/p>\n\n\n\n<p>Les bras peuvent m\u00eame r\u00e9agir apr\u00e8s avoir \u00e9t\u00e9 compl\u00e8tement sectionn\u00e9s. Plusieurs exp\u00e9riences ont montr\u00e9 que<strong> Les bras sectionn\u00e9s tremblaient de douleur lorsque les chercheurs les pin\u00e7aient.<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">L&#039;encre de poulpe ne cache pas seulement l&#039;animal<\/h3>\n\n\n\n<p><strong>L&#039;encre endommage physiquement les ennemis.<\/strong>, car il contient un compos\u00e9 appel\u00e9 <strong>tyrosinase <\/strong>qui, chez l&#039;homme, aide \u00e0 <strong>contr\u00f4ler la production de m\u00e9lanine<\/strong>. Mais lorsqu&#039;elle est pulv\u00e9ris\u00e9e dans les yeux d&#039;un pr\u00e9dateur, la tyrosinase provoque une <strong>irritation aveuglante<\/strong>. Aussi <strong>d\u00e9forme l&#039;odorat et le go\u00fbt des cr\u00e9atures<\/strong>La concoction d\u00e9fensive est si puissante que les pieuvres qui ne parviennent pas \u00e0 \u00e9chapper \u00e0 leur propre nuage d\u2019encre peuvent mourir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ils ont du sang bleu<\/h3>\n\n\n\n<p>Pour survivre dans le <a href=\"https:\/\/almanimal.com\/fr\/curiosites\/especes-etranges-recemment-decouvertes-dans-locean\/\">profondeurs de l&#039;oc\u00e9an<\/a>Les pieuvres ont d\u00e9velopp\u00e9 un sang \u00e0 base de cuivre au lieu de fer appel\u00e9 h\u00e9mocyanine, ce qui rend leur sang bleu. <strong>L&#039;h\u00e9mocyanine est plus efficace pour transporter l&#039;oxyg\u00e8ne que l&#039;h\u00e9moglobine <\/strong>quand le <strong>La temp\u00e9rature de l\u2019eau est tr\u00e8s basse et il n\u2019y a pas beaucoup d\u2019oxyg\u00e8ne autour.<\/strong>.<\/p>\n\n\n\n<p>Mais ce syst\u00e8me les rend \u00e9galement extr\u00eamement <strong>sensible aux changements d&#039;acidit\u00e9<\/strong>Si le pH de l&#039;eau baisse trop, les poulpes ne peuvent pas faire circuler suffisamment d&#039;oxyg\u00e8ne. Par cons\u00e9quent, les chercheurs s&#039;inqui\u00e8tent du sort de ces animaux suite \u00e0 l&#039;acidification des oc\u00e9ans induite par le changement climatique.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pour certains, les pieuvres sont des muses \u00e9rotiques.<\/h3>\n\n\n\n<p>Le c\u00e9l\u00e8bre <strong>Le \u00ab tentacule \u00e9rotique \u00bb du Japon<\/strong> remonte \u00e0 une gravure sur bois de 1814 intitul\u00e9e <em>Tako \u00e0 Ama<\/em>, soit <em>Le poulpe et le plongeur de coquillages<\/em>L&#039;image est inspir\u00e9e d&#039;une l\u00e9gende sur une plongeuse poursuivie par des cr\u00e9atures marines, dont des pieuvres, apr\u00e8s avoir attir\u00e9 l&#039;attention d&#039;un dieu dragon des mers.<\/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\/2021\/05\/curiosidades-cefalopodos.jpg\" alt=\"curiosit\u00e9s sur les c\u00e9phalopodes\" class=\"wp-image-19708\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-cefalopodos.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-cefalopodos-300x200.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2021\/05\/curiosidades-cefalopodos-768x511.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Apr\u00e8s l&#039;accouplement, ils meurent<\/h3>\n\n\n\n<p>Les <strong>L&#039;accouplement et la parentalit\u00e9 n&#039;ont lieu qu&#039;une seule fois chez les pieuvres<\/strong>qui <strong>ils meurent peu de temps apr\u00e8s<\/strong>, car l&#039;esp\u00e8ce pratique la f\u00e9condation externe. Plusieurs m\u00e2les ins\u00e8rent leurs spermatophores directement dans un entonnoir tubulaire que la femelle utilise pour respirer, ou lui tendent litt\u00e9ralement le sperme, qu&#039;elle accepte toujours avec l&#039;un de ses tentacules droits. Les m\u00e2les s&#039;\u00e9loignent ensuite pour mourir. <\/p>\n\n\n\n<p>Quant aux femelles, <strong>Ils peuvent pondre jusqu&#039;\u00e0 400 000 \u0153ufs<\/strong>, qui se soucient de mani\u00e8re obsessionnelle. Donnant la priorit\u00e9 \u00e0 leurs devoirs maternels, les <strong>les femelles arr\u00eatent de manger<\/strong>. Mais elle ne meurt pas de faim ; au contraire, lorsque les \u0153ufs \u00e9closent, le corps de la femelle entreprend une sorte de<strong> suicide cellulaire<\/strong>, partant des glandes optiques et se propageant vers l&#039;ext\u00e9rieur \u00e0 travers ses tissus et ses organes jusqu&#039;\u00e0 sa mort.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">La plupart du gibier provient d\u2019Afrique du Nord et de l\u2019Ouest.<\/h3>\n\n\n\n<p>La pieuvre a \u00e9t\u00e9 une <strong>aliment courant en Asie de l&#039;Est, en Espagne, en Gr\u00e8ce et dans d&#039;autres pays<\/strong> depuis des si\u00e8cles, et a r\u00e9cemment gagn\u00e9 en popularit\u00e9 aux \u00c9tats-Unis. Aujourd&#039;hui, <strong>Les Cor\u00e9ens sont ceux qui consomment le plus de poulpe<\/strong>. <\/p>\n\n\n\n<p>Mais cette popularit\u00e9 a eu un impact sur les populations de poulpes dans les oc\u00e9ans du monde entier. <strong>Japon<\/strong>, par exemple, les prises de poulpes <strong>Ils ont chut\u00e9 de 50 % entre les ann\u00e9es 1960 et 1980.<\/strong>La demande internationale pour les p\u00eacheries inspir\u00e9es du poulpe<strong> L\u2019Afrique du Nord et de l\u2019Ouest a commenc\u00e9 \u00e0 p\u00eacher ces animaux dans les ann\u00e9es 1980.<\/strong>, bien que r\u00e9cemment la demande ait \u00e9galement affect\u00e9 ces eaux, transf\u00e9rant le <strong>p\u00eacheries du Maroc \u00e0 la Mauritanie<\/strong> et, plus r\u00e9cemment, \u00e0 <strong>S\u00e9n\u00e9gal<\/strong>. <\/p>\n\n\n\n<p>Selon l\u2019Organisation des Nations Unies pour l\u2019alimentation et l\u2019agriculture, plusieurs pays dans le monde importent environ <strong>270 000 tonnes de poulpes<\/strong>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Les pieuvres, ces c\u00e9phalopodes intelligents et \u00e9tranges, semblent incarner tout ce qui est effrayant et myst\u00e9rieux dans la mer\u00a0: l\u2019id\u00e9e de leurs corps mous tapis dans les recoins sombres des oc\u00e9ans a inspir\u00e9 des monstres l\u00e9gendaires, du Kraken au Lusca, le monstre mangeur d\u2019hommes des Bahamas. Leurs formes surnaturelles, sublim\u00e9es par leurs bras tendus, en font des animaux myst\u00e9rieux qui piquent notre curiosit\u00e9 pour leur anatomie. Vous voulez savoir combien de c\u0153urs poss\u00e8de une pieuvre et d\u00e9couvrir d\u2019autres anecdotes int\u00e9ressantes sur cet animal\u00a0? Nous vous les expliquons dans cet article.<\/p>","protected":false},"author":20,"featured_media":19707,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1430],"tags":[1628,2658,1468,2659,2655],"class_list":["post-19661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-cefalopodos","tag-corazones-de-un-pulpo","tag-curiosidades","tag-curiosidades-sobre-los-pulpos","tag-pulpo"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cu\u00e1ntos corazones tiene un pulpo y otras curiosidades sobre este animal<\/title>\n<meta name=\"description\" content=\"\u00bfQuieres saber cu\u00e1ntos corazones tiene un pulpo y otras curiosidades sobre estos animales misteriosos? 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