{"id":390,"date":"2025-05-04T16:53:16","date_gmt":"2025-05-04T14:53:16","guid":{"rendered":"https:\/\/www.sardiniaonboard.com\/en\/?p=390"},"modified":"2025-07-04T20:30:01","modified_gmt":"2025-07-04T18:30:01","slug":"coasteering-cala-girgolu","status":"publish","type":"post","link":"https:\/\/www.sardiniaonboard.com\/en\/coasteering-cala-girgolu\/","title":{"rendered":"Posidonia Oceanica: the lung of the sea that we protect too little"},"content":{"rendered":"\r\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\r\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis: 20px;\">\u00a0<\/div>\r\n\r\n\r\n\r\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\u00a0<\/div>\r\n\r\n\r\n\r\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis: 20px;\">\u00a0<\/div>\r\n<\/div>\r\n\r\n\r\n\r\n<p>&nbsp;<\/p>\r\n<p>&nbsp;<\/p>\r\n<!-- Open Graph & Twitter Card Metadata -->\r\n<p>&nbsp;<\/p>\r\n<p><style>\r\n    body {\r\n      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;\r\n      background: #fdfdfd;\r\n      color: #333;\r\n      margin: 0;\r\n      padding: 0;\r\n      line-height: 1.6;\r\n    }\r\n    article {\r\n      max-width: 800px;\r\n      margin: 40px auto;\r\n      padding: 20px;\r\n      background: #ffffff;\r\n      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);\r\n      border-radius: 10px;\r\n    }\r\n    h1, h2 {\r\n      color: #046C6C;\r\n    }\r\n    h1 {\r\n      font-size: 2.2em;\r\n      margin-bottom: 0.5em;\r\n    }\r\n    h2 {\r\n      font-size: 1.5em;\r\n      margin-top: 1.5em;\r\n    }\r\n    img {\r\n      max-width: 100%;\r\n      border-radius: 8px;\r\n      margin: 20px 0;\r\n    }\r\n    a {\r\n      color: #047A7A;\r\n      font-weight: bold;\r\n      text-decoration: none;\r\n    }\r\n    a:hover {\r\n      text-decoration: underline;\r\n    }\r\n    strong {\r\n      color: #000;\r\n    }\r\n    em {\r\n      color: #555;\r\n    }\r\n    footer {\r\n      background: #E6FAF9;\r\n      padding: 15px;\r\n      border-radius: 8px;\r\n      margin-top: 30px;\r\n      text-align: center;\r\n    }\r\n  <\/style><\/p>\r\n<article><header>\r\n<section>\r\n<p><span style=\"font-weight: 400;\">Same beach, same sea\u2026 and yet, the same old story.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Someone shows up, lays down their towel, and pulls a face:<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">\u201cUgh, what\u2019s with all this seaweed?\u201d<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">But here\u2019s the thing \u2014 it\u2019s not seaweed.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">And no, it\u2019s not gross either.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">That brown layer so many wish would vanish?<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s one of the main reasons the sea is still crystal clear, full of life, and in balance.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s <\/span><b>Posidonia oceanica.<\/b><\/p>\r\n<p><span style=\"font-weight: 400;\">A marine plant \u2014 not just underwater greenery, but a living treasure.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It protects the seabed, slows erosion, and offers shelter to countless marine species.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">when it washes up on shore, it still plays its part.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Yet we keep removing it like it\u2019s just rubbish.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">In this article, we\u2019ll show you why Posidonia \u2014 even when it looks messy \u2014 is really the sea\u2019s quiet way of saying:<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">\u201cI\u2019m still alive, and I\u2019m still trying to take care of you.\u201d<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">And if you\u2019re curious to know what it truly means to explore the sea with respect, read how we encounter dolphins while paddleboarding in Sardinia:\u00a0<strong><a href=\"https:\/\/www.sardiniaonboard.com\/en\/sup-dolphins-sardinia\/\">SUP and dolphins in Sardinia: when you enter their world<\/a><\/strong><\/span><\/p>\r\n<p>&nbsp;<\/p>\r\n<\/section>\r\n<\/header>\r\n<h1><b>What is Posidonia oceanica, really?<\/b><\/h1>\r\n<p><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><span style=\"font-weight: 400;\">Let\u2019s be honest \u2014 we\u2019ve all made the same mistake.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">We see those long brown strips floating in the water and immediately think: \u201cseaweed.\u201d<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">But it\u2019s not.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Posidonia oceanica is a higher marine plant, with roots, stems, and leaves.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It creates vibrant, living underwater meadows \u2014 essential to the health of the Mediterranean.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s a species found only in this part of the world.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Its long, ribbon-like leaves move with the current like underwater grass swaying in the blue.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">We often spot it during our tours \u2014 filtering light, sheltering life, all in complete silence.<\/span><\/p>\r\n<p>&nbsp;<\/p>\r\n<p><span style=\"font-weight: 400;\">Like any plant, it photosynthesizes, producing oxygen and absorbing CO\u2082, helping to maintain the delicate balance of the marine ecosystem.\u00a0<\/span><\/p>\r\n<p>&nbsp;<\/p>\r\n<p><span style=\"font-weight: 400;\">And even when its leaves detach and drift ashore, it\u2019s not waste \u2014 and it\u2019s certainly not the end.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s simply the \u201cfinal journey\u201d: a change of form, not of purpose.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Even outside the water, Posidonia keeps protecting the coast, holding onto sand, and quietly caring for the sea.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">According to ISPRA (Italy\u2019s Institute for Environmental Protection and Research), Posidonia oceanica is considered a priority habitat under EU Directive 92\/43\/EEC.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s not just a plant.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s the silent guardian of the Mediterranean.<\/span><\/p>\r\n<p><b>It\u2019s also a powerful bioindicator of marine health: its presence signals clean, well-oxygenated, and stable ecosystems. Where Posidonia thrives, the sea is in balance.<\/b><\/p>\r\n<img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-444 aligncenter\" src=\"https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/image3-1024x576-1-500x281.png\" alt=\"\" width=\"500\" height=\"281\" srcset=\"https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/image3-1024x576-1-500x281.png 500w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/image3-1024x576-1-300x169.png 300w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/image3-1024x576-1-133x75.png 133w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/image3-1024x576-1-480x270.png 480w\" sizes=\"auto, (max-width:767px) 480px, 500px\" \/>\r\n<h1><b>Why it matters so much to the sea<\/b><\/h1>\r\n<p><span style=\"font-weight: 400;\">Posidonia oceanica is one of the sea\u2019s most powerful \u2014 yet often overlooked \u2014 allies.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Beneath the sand, its roots form a dense web of rhizomes. But what makes it truly special is its ability to grow both vertically and horizontally, creating a natural framework that stabilizes sediments, slows down currents and waves, and protects the coastline from erosion.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s like the sea is building an underwater dam \u2014 made entirely of life.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Every time we stop with our SUP boards above a Posidonia meadow, we see this miracle with our own eyes: the water is calmer, clearer, the seafloor more stable. And even the air feels different.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s not just a feeling.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">One square meter of Posidonia can produce up to 20 liters of oxygen per day, supporting the health of the entire marine ecosystem (Source: ISPRA \u2013 Institute for Environmental Protection and Research).<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Its seemingly simple leaves hide an entire micro-world: colorful fish, tiny crustaceans, starfish resting on the bottom\u2026 and sometimes even seahorses, delicately wrapped around the green blades as if suspended in a slow-motion dance.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">These meadows are like underwater nurseries \u2014 natural sanctuaries where life can thrive, protected and undisturbed.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Without Posidonia, the Mediterranean just wouldn\u2019t be the same.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">To protect it is to protect the sea\u2019s biodiversity \u2014 and its future.<\/span><\/p>\r\n<p>&nbsp;<\/p>\r\n<h1><b>A natural shield against erosion<\/b><\/h1>\r\n<p><span style=\"font-weight: 400;\">Every time we walk along a beach, we should remember that beneath our feet lies a fragile balance built by the sea \u2014 and much of that silent, vital work is done by Posidonia.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">When its leaves break off and wash ashore, they become a natural barrier against winter storms.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">What many call \u201cbeach waste\u201d is actually the <strong>banquette<\/strong>: a thick carpet of dry leaves that traps the sand, softens the impact of the waves, and protects the coastline.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Without it, every winter storm would steal meters of shoreline.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">And then there are the <strong>egagropili<\/strong> \u2014 the so-called \u201csea balls\u201d many of us remember from childhood, rolling along the shore like tiny mysteries left behind by the waves.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">These compact spheres are formed by wave action, made of intertwined Posidonia fibers.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">They\u2019re nature\u2019s handiwork \u2014 small, perfect artefacts that are too often tossed away without a second thought, even though they\u2019re part of an essential ecological cycle.<\/span><\/p>\r\n<p><b><br style=\"font-weight: 400;\" \/><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-445 aligncenter\" src=\"https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/posidonia-oceanica-003-500x333.png\" alt=\"\" width=\"500\" height=\"333\" srcset=\"https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/posidonia-oceanica-003-500x333.png 500w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/posidonia-oceanica-003-300x200.png 300w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/posidonia-oceanica-003-112x75.png 112w, https:\/\/www.sardiniaonboard.com\/en\/wp-content\/uploads\/2025\/05\/posidonia-oceanica-003-480x320.png 480w\" sizes=\"auto, (max-width:767px) 480px, 500px\" \/><\/b><\/p>\r\n<p><span style=\"font-weight: 400;\">Unfortunately, the systematic removal of Posidonia from beaches is not just an aesthetic issue \u2014 it\u2019s an ecological wound.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">According to recent estimates, the loss of one square meter of meadow can lead to the erosion of up to 15 meters of sandy coastline, with direct consequences for tourism and local communities.<\/span><\/p>\r\n<p><b>\u00a0<\/b><span style=\"font-weight: 400;\">That\u2019s why some places are trying to make amends, giving back to the sea what has been taken.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">In Golfo Aranci, Sardinia, the \u201c<strong>Posidonia Project<\/strong>\u201d was launched: a marine reforestation initiative by <strong>Worldrise Onlus<\/strong> and <strong>ZeroCO2<\/strong>, supported by the International School for Scientific Diving (<strong>ISSD<\/strong>) and backed by the Sardinia Region and the Municipality of Golfo Aranci.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Here, 2,500 cuttings have been planted across 100 square meters of seabed.<\/span><\/p>\r\n<p><b>\u00a0<\/b><span style=\"font-weight: 400;\">It\u2019s not just symbolic.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">It\u2019s a real act of care.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Because every meadow that comes back to life, every blade that starts dancing again below the surface, is a promise \u2014 that the Mediterranean still breathes, still belongs to all of us.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Protecting Posidonia means protecting everything that keeps the sea alive:<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">the clarity of its waters, the beaches we walk on, the creatures that call it home.<\/span><\/p>\r\n<p><b>\u00a0<\/b><span style=\"font-weight: 400;\">For too long, we\u2019ve seen it as a nuisance.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">We thought it was dirty, dead, useless.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">But it was actually a sign of a healthy ocean.<\/span><\/p>\r\n<p><b>\u00a0<\/b><span style=\"font-weight: 400;\">Now we know how to recognize it.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">And we can learn to respect it.<\/span><\/p>\r\n<p><b>\u00a0<\/b><\/p>\r\n<p><span style=\"font-weight: 400;\">If you want to feel what it means to become part of this delicate balance, come paddle with us.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Standing on your board, gliding above vast underwater meadows, you\u2019ll feel like you\u2019re flying over a sunken garden.<\/span><\/p>\r\n<p><span style=\"font-weight: 400;\">Beneath the surface, graceful creatures roam among the leaves \u2014 a hidden world, quietly thriving, waiting to be seen.<\/span><\/p>\r\n<p style=\"text-align: center;\"><b><br style=\"font-weight: 400;\" \/><a href=\"https:\/\/www.sardiniaonboard.com\/en\/prenota\/\">BOOK NOW<\/a><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><\/b><\/p>\r\n<p><br style=\"font-weight: 400;\" \/><br style=\"font-weight: 400;\" \/><br \/><\/p>\r\n<div style=\"display: flex; justify-content: center; align-items: center; margin: 40px 0;\"><script type=\"text\/javascript\" src=\"https:\/\/widgets.regiondo.net\/button\/v1\/button-widget.min.js\"><\/script><\/div>\r\n<\/article>\r\n<p><script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"http:\/\/schema.org\",\r\n  \"@type\": \"Article\",\r\n  \"mainEntityOfPage\": {\r\n    \"@type\": 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