{"id":4876,"date":"2026-01-06T15:56:34","date_gmt":"2026-01-06T14:56:34","guid":{"rendered":"https:\/\/martinique2050.com\/hypotheses-sur-levolution-des-sargasses\/"},"modified":"2026-07-13T14:14:07","modified_gmt":"2026-07-13T18:14:07","slug":"hypotheses-sur-levolution-des-sargasses","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/hypotheses-sur-levolution-des-sargasses\/","title":{"rendered":"Hypoth\u00e8ses sur l\u2019\u00e9volution des sargasses"},"content":{"rendered":"<div class=\"entry-content\">\n<p align=\"justify\"><b>Pour le moment, aucune \u00e9tude n\u2019a permit de confirmer la raison de cette nouvelle trajectoire des algues sargasses et ces \u00e9chouages massifs dans la Cara\u00efbe. Les premi\u00e8res hypoth\u00e8ses ont \u00e9t\u00e9 \u00e9mises en 2011 et ont progress\u00e9 avec l\u2019acquisition de donn\u00e9es nouvelles (2). Diff\u00e9rentes explications sont propos\u00e9es par la communaut\u00e9 scientifique.<\/b><\/p>\n<p align=\"justify\"><b>Modification des courants oc\u00e9aniques<\/b><\/p>\n<p align=\"justify\">Une des hypoth\u00e8ses de cette augmentation importante de sargasses dans l\u2019arc antillais vient du fait que pour diff\u00e9rentes raisons, les courants oc\u00e9aniques subissent des modifications et induiraient un d\u00e9tachement plus important d\u2019algues de la mer des sargasses, qui finiraient leur course dans la Cara\u00efbe (2).<\/p>\n<p align=\"justify\"><b>Fuite de p\u00e9trole dans le golfe du Mexique et d\u00e9versement de dispersant <\/b><\/p>\n<p align=\"justify\">En 2010, un an avant les premiers arrivages massifs de sargasses dans l\u2019arc antillais, survenait l\u2019incident de \u00abDeepwater Horizon\u00bb. Les dispersants utilis\u00e9s pour lutter contre la mar\u00e9e noire induite par l\u2019explosion de la plate-forme p\u00e9troli\u00e8re, auraient augment\u00e9 le taux de nutriments, ce qui aurait \u00e0 son tour provoqu\u00e9 la prolif\u00e9ration des sargasses. Les algues auraient par la suite voyag\u00e9 jusqu\u2019\u00e0 l\u2019arc antillais par le biais des courants. Cette possibilit\u00e9 n\u2019a pas \u00e9t\u00e9 prouv\u00e9e et demeure une hypoth\u00e8se (2).<\/p>\n<div id=\"attachment_2874\" style=\"width: 758px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-2874\" class=\"wp-image-2874 size-full\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20748%20343'%3E%3C\/svg%3E\" alt=\"\" width=\"748\" height=\"343\" data-lazy-sizes=\"(max-width: 748px) 100vw, 748px\"><noscript><\/noscript><\/p>\n<p id=\"caption-attachment-2874\" class=\"wp-caption-text\">Carte DEAL Guadeloupe : <a href=\"..\/documents\/2014-note-sargasses-fmazeas-deal-unite-biodiversite-marine-maj-5fev2015.pdf\">http:\/\/www.ifrecor.com\/documents\/2014-note-sargasses-fmazeas-deal-unite-biodiversite-marine-maj-5fev2015.pdf<\/a><\/p>\n<\/div>\n<p align=\"justify\"><b>La petite mer des sargasses<\/b><\/p>\n<p align=\"justify\">La cause la plus plausible serait la formation d\u2019une nouvelle \u00abpetite mer des sargasses\u00bb dans la r\u00e9gion nord br\u00e9silienne, qui a pu \u00eatre observ\u00e9e par images satellites (2). La cr\u00e9ation de cette r\u00e9cente accumulation et prolif\u00e9ration serait due \u00e0 deux param\u00e8tres.<\/p>\n<p align=\"justify\">Une quantit\u00e9 importante de nutriments favorables aux algues sargasses se serait accumul\u00e9e dans la r\u00e9gion de recirculation nord \u00e9quatorial (NERR \u2013 North Equatorial Recirculation Region) localis\u00e9e entre le Br\u00e9sil et l\u2019Afrique (2). Les rivi\u00e8res Congo, Amazone et Or\u00e9noque, en plus des poussi\u00e8res provenant du d\u00e9sert du Sahara, auraient contribu\u00e9 \u00e0 l\u2019accumulation de ces \u00e9l\u00e9ments nutritifs dans cette zone (6).<\/p>\n<p align=\"justify\">En 2010, des conditions climatiques irr\u00e9guli\u00e8res auraient pu favoriser la formation de cette \u00abpetite mer des sargasses\u00bb. La basse pression atmosph\u00e9rique au niveau des \u00eeles portugaises des A\u00e7ores a eu pour effets de diminuer la force des vents provenant de l\u2019ouest, de mod\u00e9rer la fr\u00e9quence des temp\u00eates sur l\u2019oc\u00e9an Atlantique et de r\u00e9chauffer l\u2019eau oc\u00e9anique de la NERR. Celle-ci aurait \u00e9t\u00e9 moins tumultueuse, ce qui aurait privil\u00e9gi\u00e9 l\u2019accumulation d\u2019\u00e9l\u00e9ments nutritifs \u00e0 cet endroit, favorisant ainsi la prolif\u00e9ration des algues sargasses (2).<\/p>\n<p align=\"justify\"><b>En conclusion<\/b><\/p>\n<p align=\"justify\">Suite aux \u00e9tudes men\u00e9es par la NOAA (National Oceanic and Atmospheric Administration), les scientifiques croient que ce nouveau ph\u00e9nom\u00e8ne d\u2019arrivages massifs d\u2019algues sargasses dans l\u2019arc antillais pourrait \u00eatre le r\u00e9sultat du r\u00e9chauffement plan\u00e9taire et qu\u2019il perdurera dans les ann\u00e9es \u00e0 venir (7).<\/p>\n<p style=\"text-align: right\" align=\"justify\">Mariska Desmarquis<\/p>\n<hr>\n<p align=\"justify\">R\u00e9f\u00e9rences<\/p>\n<p style=\"font-size: xx-small\" align=\"justify\">1- Agence Nationale de s\u00e9curit\u00e9 sanitaire alimentation, environnement, travail (ANSES), 2017. Expositions aux \u00e9manations d\u2019algues sargasses en d\u00e9composition au Antilles et en Guyane. [PDF en ligne] : <a href=\"..\/fr\/system\/files\/AIR2015SA0225Ra.pdf\">https:\/\/www.anses.fr\/fr\/system\/files\/AIR2015SA0225Ra.pdf<\/a> Page consult\u00e9e le 27 mars 2018.<br \/>\n2- FLORENNE, T. et <i>al., <\/i>2016. Le ph\u00e9nom\u00e8ne d\u2019\u00e9chouage des sargasses dans les Antilles et en Guyane. Gouvernement Fran\u00e7ais. [PDF en ligne] : <a href=\"http:\/\/cgedd.documentation.developpement-durable.gouv.fr\/documents\/cgedd\/010345-01_rapport.pdf\">http:\/\/cgedd.documentation.developpement-durable.gouv.fr\/documents\/cgedd\/010345-01_rapport.pdf<\/a> Page consult\u00e9e le 27 mars 2018.<br \/>\n3- Institue Fran\u00e7ais de la Mer Comit\u00e9 Toulon Provence Corse, 2016. Les algues sargasses : fl\u00e9au ou opportunit\u00e9. [PDF en ligne] : <a href=\"..\/assets\/documents\/files\/documents_ifm\/Les-algues-sargasses.pdf\">http:\/\/www.ifmer.org\/assets\/documents\/files\/documents_ifm\/Les-algues-sargasses.pdf<\/a> Page consult\u00e9 le 27 mars 2018.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pour le moment, aucune \u00e9tude n\u2019a permit de confirmer la raison de cette nouvelle trajectoire des algues sargasses et ces \u00e9chouages massifs dans la Cara\u00efbe. Les premi\u00e8res hypoth\u00e8ses ont \u00e9t\u00e9 \u00e9mises en 2011 et ont progress\u00e9 avec l\u2019acquisition de donn\u00e9es nouvelles (2). Diff\u00e9rentes explications sont propos\u00e9es par la communaut\u00e9 scientifique. Modification des courants oc\u00e9aniques Une &hellip;<\/p>","protected":false},"author":1,"featured_media":4864,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_yoast_wpseo_meta-robots-noindex":"","_yoast_wpseo_canonical":"","_yoast_wpseo_opengraph-title":"","_yoast_wpseo_opengraph-description":"","_yoast_wpseo_twitter-title":"","_yoast_wpseo_twitter-description":"","footnotes":""},"categories":[1187,1576],"tags":[1562,1563,1286],"class_list":["post-4876","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-sante-qualite-de-vie","tag-evolution-des-sargasses","tag-petite-mer-des-sargasses","tag-sargasses"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hypoth\u00e8ses sur l\u2019\u00e9volution des sargasses - martinique2050<\/title>\n<meta name=\"description\" content=\"Pour le moment, aucune \u00e9tude n\u2019a permit de confirmer la raison de cette nouvelle trajectoire des algues sargasses et ces \u00e9chouages massifs dans la\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/martinique2050.com\/en\/hypotheses-sur-levolution-des-sargasses\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hypoth\u00e8ses sur l\u2019\u00e9volution des sargasses - 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