{"id":5069,"date":"2025-02-12T09:13:51","date_gmt":"2025-02-12T14:13:51","guid":{"rendered":"https:\/\/sargassummonitoring.com\/?p=5069"},"modified":"2025-06-08T10:29:41","modified_gmt":"2025-06-08T14:29:41","slug":"the-true-cause-of-massive-blooms","status":"publish","type":"post","link":"https:\/\/sargassummonitoring.com\/fr\/the-true-cause-of-massive-blooms\/","title":{"rendered":"Sargasses : Une nouvelle \u00e9tude r\u00e9v\u00e8le la v\u00e9ritable cause des prolif\u00e9rations massives"},"content":{"rendered":"<figure class=\"wp-block-post-featured-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1922\" height=\"919\" src=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring.webp\" class=\"attachment-post-thumbnail size-post-thumbnail wp-post-image\" alt=\"The True Cause of Massive Blooms\" style=\"object-fit:cover;\" srcset=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring.webp 1922w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring-300x143.webp 300w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring-1024x490.webp 1024w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring-768x367.webp 768w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring-1536x734.webp 1536w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/SARGASSUM-BELT-origin-sargassum-monitoring-18x9.webp 18w\" sizes=\"auto, (max-width: 1922px) 100vw, 1922px\" \/><\/figure>\n\n\n<div style=\"height:38px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8448343880170654\"\n     crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\"\n     style=\"display:block; text-align:center;\"\n     data-ad-layout=\"in-article\"\n     data-ad-format=\"fluid\"\n     data-ad-client=\"ca-pub-8448343880170654\"\n     data-ad-slot=\"3026197241\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<h1 class=\"wp-block-heading has-medium-font-size\"><strong>\"Une nouvelle \u00e9tude r\u00e9v\u00e8le le facteur d\u00e9clencheur des prolif\u00e9rations massives de sargasses\"<\/strong><\/h1>\n\n\n\n<p>Depuis 2011, les \u00e9chouements massifs de <strong>sargasses<\/strong> perturbent les \u00e9cosyst\u00e8mes marins et les populations c\u00f4ti\u00e8res dans l'Atlantique tropical. Une \u00e9tude r\u00e9cente, publi\u00e9e dans la revue <em>Communications Earth &amp; Environment<\/em>, met en lumi\u00e8re un \u00e9l\u00e9ment cl\u00e9 derri\u00e8re ce ph\u00e9nom\u00e8ne : un <strong>\u00e9v\u00e9nement extr\u00eame de l\u2019Oscillation Nord-Atlantique (NAO) en 2009-2010<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Un basculement \u00e9cologique en 2010<\/strong><\/h2>\n\n\n\n<p>L'\u00e9tude d\u00e9montre que cet \u00e9v\u00e9nement climatique exceptionnel a modifi\u00e9 les courants oc\u00e9aniques, transportant les sargasses du gyre subtropical de l\u2019Atlantique Nord vers l'Atlantique tropical. Ce changement a marqu\u00e9 un v\u00e9ritable <strong>point de bascule \u00e9cologique<\/strong>, expliquant la pr\u00e9sence massive de sargasses dans cette r\u00e9gion depuis 2011.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"860\" src=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-1024x860.webp\" alt=\"The True Cause of Massive Blooms\" class=\"wp-image-5072\" srcset=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-1024x860.webp 1024w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-300x252.webp 300w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-768x645.webp 768w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-1536x1290.webp 1536w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo-14x12.webp 14w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/origin-sargassum-belt-sargassum-monitoring-monitoreo-sargazo.webp 1612w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center has-small-font-size\">Photo: Mady A\u00efssata Merine<\/p>\n\n\n\n<div style=\"height:23px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Le r\u00f4le des nutriments : une id\u00e9e re\u00e7ue corrig\u00e9e<\/strong><\/h2>\n\n\n\n<p>Contrairement aux id\u00e9es re\u00e7ues, cette \u00e9tude confirme que les prolif\u00e9rations ne sont <strong>pas directement caus\u00e9es par les apports en nutriments des rivi\u00e8res<\/strong> (Amazon, Or\u00e9noque, Mississippi, Niger, etc.) ni par les poussi\u00e8res sahariennes. Au contraire, les sargasses trouvent l\u2019essentiel de leurs nutriments gr\u00e2ce au <strong>m\u00e9lange vertical saisonnier des eaux tropicales<\/strong>, qui apporte les \u00e9l\u00e9ments n\u00e9cessaires \u00e0 leur croissance depuis les profondeurs oc\u00e9aniques.<\/p>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Pourquoi les \u00e9chouements se r\u00e9p\u00e8tent chaque ann\u00e9e ?<\/strong><\/h2>\n\n\n\n<p>Plusieurs facteurs permettent aux prolif\u00e9rations des sargasses de se maintenir ann\u00e9e apr\u00e8s ann\u00e9e :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Des conditions favorables<\/strong> en Atlantique tropical (temp\u00e9rature, lumi\u00e8re, nutriments disponibles).<\/li>\n\n\n\n<li><strong>Le maintien des sargasses sous la Zone de Convergence Intertropicale (ITCZ) en hiver<\/strong>, assurant leur survie et leur prolif\u00e9ration l\u2019ann\u00e9e suivante.<\/li>\n\n\n\n<li><strong>Le transport par les courants oc\u00e9aniques<\/strong>, qui dispersent les algues vers les Cara\u00efbes, l\u2019Afrique de l\u2019Ouest et le Golfe du Mexique.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Quel lien avec le changement climatique ?<\/strong><\/h2>\n\n\n\n<p>Bien que cette \u00e9tude identifie l'\u00e9v\u00e9nement NAO de 2009-2010 comme d\u00e9clencheur, elle soul\u00e8ve aussi des questions sur l\u2019impact du <strong>changement climatique<\/strong>. La hausse des temp\u00e9ratures oc\u00e9aniques pourrait modifier la dynamique des sargasses et influencer leur r\u00e9partition future.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"805\" height=\"539\" src=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/sargassum-monitoring-invasion-proliferation.webp\" alt=\"\" class=\"wp-image-5073\" srcset=\"https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/sargassum-monitoring-invasion-proliferation.webp 805w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/sargassum-monitoring-invasion-proliferation-300x201.webp 300w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/sargassum-monitoring-invasion-proliferation-768x514.webp 768w, https:\/\/sargassummonitoring.com\/wp-content\/uploads\/2025\/02\/sargassum-monitoring-invasion-proliferation-18x12.webp 18w\" sizes=\"auto, (max-width: 805px) 100vw, 805px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong>Un tournant dans la compr\u00e9hension du ph\u00e9nom\u00e8ne<\/strong><\/h2>\n\n\n\n<p>Cette d\u00e9couverte remet en question certaines hypoth\u00e8ses sur l'origine des blooms de sargasses et souligne l\u2019importance des courants oc\u00e9aniques dans leur r\u00e9gulation. Elle permet aussi d\u2019orienter la recherche vers des mod\u00e8les pr\u00e9dictifs plus pr\u00e9cis afin d\u2019anticiper les \u00e9chouements et de mieux g\u00e9rer cette crise \u00e9cologique.<\/p>\n\n\n\n<p>\u27a1\ufe0f <em>Chez Sargassum Monitoring, nous continuerons \u00e0 suivre les avanc\u00e9es scientifiques et \u00e0 partager les informations essentielles pour comprendre et lutter contre ce fl\u00e9au.<\/em><\/p>\n\n\n\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-8448343880170654\"\n     crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\"\n     style=\"display:block; text-align:center;\"\n     data-ad-layout=\"in-article\"\n     data-ad-format=\"fluid\"\n     data-ad-client=\"ca-pub-8448343880170654\"\n     data-ad-slot=\"3026197241\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<div style=\"height:52px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"font-size:15px\">Ce r\u00e9sum\u00e9 est bas\u00e9 sur l'\u00e9tude originale de Jouanno, J., Berthet, S., Muller-Karger, F. et al. <em>An extreme North Atlantic Oscillation event drove the pelagic Sargassum tipping point<\/em>, publi\u00e9e dans <em>Communications Earth &amp; Environment<\/em> (Nature Portfolio). L'article complet est disponible sous licence Creative Commons BY-NC-ND 4.0 \u00e0 cette adresse: <a href=\"https:\/\/rdcu.be\/d9vC3\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/rdcu.be\/d9vC3<\/a><\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;A New Study Reveals the Triggering Factor Behind Massive Sargassum Blooms&#8221; Since 2011, massive sargassum strandings have disrupted marine ecosystems and coastal communities in the tropical Atlantic. A recent study, published in Communications Earth &amp; Environment, highlights a key element behind this phenomenon: an extreme North Atlantic Oscillation (NAO) event in 2009-2010. An Ecological Shift [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5071,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-5069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - 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