{"id":27409,"date":"2022-09-21T08:22:17","date_gmt":"2022-09-21T06:22:17","guid":{"rendered":"https:\/\/www.esnautic.com\/cadre\/posidonia-oceanica\/"},"modified":"2025-07-08T08:24:04","modified_gmt":"2025-07-08T06:24:04","slug":"posidonia-oceanica","status":"publish","type":"page","link":"https:\/\/www.esnautic.com\/fr\/cadre\/posidonia-oceanica\/","title":{"rendered":"Posidonia oceanica"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row][vc_column][vc_column_text css=\u00a0\u00bb\u00a0\u00bb el_class=\u00a0\u00bbsubtit_page\u00a0\u00bb]<\/p>\n<h2><em>La Posidonia oceanica<\/em>, une plante sous-marine tr\u00e8s abondante sur toute la c\u00f4te des Pityuses, est l\u2019un des plus grands tr\u00e9sors \u00e9cologiques de l\u2019archipel.<\/h2>\n<p>[\/vc_column_text][vc_gallery type=\u00a0\u00bbflexslider_slide\u00a0\u00bb interval=\u00a0\u00bb3&Prime; images=\u00a0\u00bb1625,1627,1629,1631&Prime; img_size=\u00a0\u00bbfull\u00a0\u00bb][\/vc_column][\/vc_row][vc_row][vc_column][vc_column_text css=\u00a0\u00bb\u00a0\u00bb]La posidonie est inscrite au patrimoine mondial d\u2019Ibiza\/Eivissa (1999) et est \u00e9galement abondante dans la baie de Portmany. La l\u00e9gislation des Bal\u00e9ares lui conf\u00e8re un niveau de protection \u00e9lev\u00e9, qui interdit notamment le mouillage, les ancres et les cha\u00eenes endommageant gravement sa v\u00e9g\u00e9tation.<\/p>\n<p>Pour la prot\u00e9ger et faciliter le mouillage le long de la c\u00f4te de l\u2019\u00eele, le gouvernement des Bal\u00e9ares a cr\u00e9\u00e9 le site web <a href=\"http:\/\/www.atlasposidonia.com\" target=\"_blank\" rel=\"noopener\">www.atlasposidonia.com<\/a>, qui propose des cartes et une application facilitant le mouillage.<\/p>\n<p>Mais pourquoi la posidonie est-elle si pr\u00e9cieuse\u2009? Six raisons expliquent sa valeur\u00a0:<\/p>\n<p>1) C\u2019est une plante end\u00e9mique qui ne vit qu\u2019en M\u00e9diterran\u00e9e. Elle n\u2019existe nulle part ailleurs au monde et est abondante dans des enclaves comme la Sicile, Chypre et le Levant espagnol, bien que les plus grandes prairies se situent entre Ibiza et Formentera, et sont consid\u00e9r\u00e9es comme l\u2019organisme vivant avec la plus longue dur\u00e9e de vie de la plan\u00e8te, avec 100\u2009000\u00a0ans d\u2019anciennet\u00e9. On estime qu\u2019il y a environ 50\u2009000\u00a0kilom\u00e8tres carr\u00e9s de posidonies en M\u00e9diterran\u00e9e.<\/p>\n<p>2) Un hectare de posidonie produit la m\u00eame quantit\u00e9 d\u2019oxyg\u00e8ne que 5\u00a0hectares de for\u00eat amazonienne, et certains scientifiques \u00e9valuent cette diff\u00e9rence jusqu\u2019\u00e0 15\u00a0hectares. Les for\u00eats submerg\u00e9es m\u00e9diterran\u00e9ennes jouent donc un r\u00f4le fondamental dans le maintien de la sant\u00e9 de la plan\u00e8te, plus efficacement que les arbres eux-m\u00eames, avec l\u2019avantage suppl\u00e9mentaire de ne pas br\u00fbler.<\/p>\n<p>3) Elles favorisent la biodiversit\u00e9, puisque plus de 1\u2009400\u00a0esp\u00e8ces diff\u00e9rentes vivent au milieu de la posidonie, et constituent \u00e9galement un refuge pour de nombreux micro-organismes de grande valeur environnementale.<\/p>\n<p>4) La posidonie s\u00e9questre 10\u00a0% des \u00e9missions de dioxyde de carbone (CO2) g\u00e9n\u00e9r\u00e9es par les \u00eeles Bal\u00e9ares. On estime d\u2019ailleurs qu\u2019elle fournit une grande partie de l\u2019oxyg\u00e8ne que nous respirons sur la plan\u00e8te.<\/p>\n<p>5) Elle prot\u00e8ge les plages en cr\u00e9ant des digues sous-marines naturelles et, lorsqu\u2019elle meurt, ses feuilles se d\u00e9posent sur le rivage, recouvrant le sable et emp\u00eachant les vagues de l\u2019emporter. Sans la posidonie, les plages seraient compl\u00e8tement diff\u00e9rentes.<\/p>\n<p>6) Elle filtre l\u2019eau, laissant la mer transparente. Sans la posidonie, nous n\u2019aurions pas les rivages turquoise qui sont notre plus grand attrait touristique, ce qui affecterait consid\u00e9rablement notre \u00e9conomie et notre mode de vie.[\/vc_column_text][vc_column_text css=\u00a0\u00bb.vc_custom_1751955834723{margin-top: 40px !important;margin-bottom: 10px !important;}\u00a0\u00bb]<b>Carte des posidonies de la baie<\/b>[\/vc_column_text][vc_single_image image=\u00a0\u00bb4013&Prime; img_size=\u00a0\u00bblarge\u00a0\u00bb onclick=\u00a0\u00bblink_image\u00a0\u00bb][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row][vc_column][vc_column_text css=\u00a0\u00bb\u00a0\u00bb el_class=\u00a0\u00bbsubtit_page\u00a0\u00bb] La Posidonia oceanica, une plante sous-marine tr\u00e8s abondante sur toute la c\u00f4te des Pityuses, est l\u2019un des plus grands tr\u00e9sors \u00e9cologiques de l\u2019archipel. [\/vc_column_text][vc_gallery type=\u00a0\u00bbflexslider_slide\u00a0\u00bb interval=\u00a0\u00bb3&Prime; images=\u00a0\u00bb1625,1627,1629,1631&Prime; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":27410,"parent":27388,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"jnews_page_loop":{"enable_page_loop":"0","first_title":"Latest Post","second_title":"","header_type":"heading_6","header_background":"","header_text_color":"","layout":"right-sidebar","sidebar":"default-sidebar","second_sidebar":"default-sidebar","sticky_sidebar":"1","module":"3","boxed":"0","boxed_shadow":"0","box_shadow":"0","excerpt_length":"20","content_date":"default","date_custom":"Y\/m\/d","content_pagination":"nav_1","pagination_align":"center","show_navtext":"0","show_pageinfo":"0","post_offset":"0","posts_per_page":"5","include_post":"","exclude_post":"","include_category":"","exclude_category":"","include_author":"","include_tag":"","exclude_tag":"","sort_by":"latest","main_custom_image_size":"default","second_custom_image_size":"default","post_sticky":"0"},"jnews_single_page":{"layout":"right-sidebar","sidebar":"gen-frances","second_sidebar":"default-sidebar","sticky_sidebar":"1","show_post_featured":"0","show_post_meta":"0","share_position":"hide","share_color":"share-monocrhome","show_post_title":"1","show_post_breadcrumbs":"1"},"footnotes":""},"class_list":["post-27409","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Posidonia oceanica - Es N\u00e0utic<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.esnautic.com\/fr\/cadre\/posidonia-oceanica\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Posidonia oceanica - Es N\u00e0utic\" \/>\n<meta property=\"og:description\" content=\"[vc_row][vc_column][vc_column_text css=\u00a0\u00bb\u00a0\u00bb el_class=\u00a0\u00bbsubtit_page\u00a0\u00bb] La Posidonia oceanica, une plante sous-marine tr\u00e8s abondante sur toute la c\u00f4te des Pityuses, est l\u2019un des plus grands tr\u00e9sors \u00e9cologiques de l\u2019archipel. 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