{"id":4863,"date":"2026-01-06T15:55:46","date_gmt":"2026-01-06T14:55:46","guid":{"rendered":"https:\/\/martinique2050.com\/consequences-des-algues-sargasses-sur-les-ecosystemes\/"},"modified":"2026-07-13T14:15:20","modified_gmt":"2026-07-13T18:15:20","slug":"consequences-des-algues-sargasses-sur-les-ecosystemes","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/consequences-des-algues-sargasses-sur-les-ecosystemes\/","title":{"rendered":"Impact of Sargassum Seaweed on Ecosystems"},"content":{"rendered":"<div class=\"entry-content\">\n<p align=\"justify\"><b>M\u00eame si les algues sargasses jouent un r\u00f4le important dans l\u2019environnement, celles-ci peuvent apporter leur lot de cons\u00e9quences n\u00e9fastes lorsque trop abondantes. L\u2019information qui suit fait la liste des principaux \u00e9cosyst\u00e8mes touch\u00e9s et des r\u00e9percussions \u00e9ventuelles dans leur environnement.<\/b><\/p>\n<p align=\"justify\"><b>Coraux et herbiers<\/b><\/p>\n<p align=\"justify\">Lorsque les algues sargasses arrivent en masse, celles-ci s\u2019accumulent en couches pr\u00e8s des c\u00f4tes et conduisent \u00e0 une perte de lumi\u00e8re disponible pour les coraux et les herbiers pr\u00e9sents (3). Cette perte de lumi\u00e8re occasionne une diminution de la photosynth\u00e8se essentielle \u00e0 leur survie, et contribue \u00e0 leur blanchiment. Parall\u00e8lement, les esp\u00e8ces d\u2019invert\u00e9br\u00e9s vivant dans les coraux et herbiers, tels que les oursins et les crabes, seront victimes d\u2019asphyxie et finiront par mourir (4). Dans le cas o\u00f9 les algues sont retir\u00e9es, il est tr\u00e8s probable que les herbiers reverdiront, mais les cons\u00e9quences sur les invert\u00e9br\u00e9s seront plus difficilement r\u00e9versibles (5).<\/p>\n<p align=\"justify\"><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-2868 aligncenter\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20800%20334'%3E%3C\/svg%3E\" alt=\"\" width=\"800\" height=\"334\" data-lazy-src=\"..\/wp-content\/uploads\/sites\/16\/2018\/04\/herbier-e1524421789206.jpg\"><noscript><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-2868 aligncenter\" src=\"..\/wp-content\/uploads\/sites\/16\/2018\/04\/herbier-e1524421789206.jpg\" alt=\"\" width=\"800\" height=\"334\"><\/noscript><\/p>\n<p align=\"justify\"><b>Mangroves<\/b><\/p>\n<p align=\"justify\">Les impacts n\u00e9gatifs de l\u2019accumulation des algues sargasses dans les mangroves proviennent de la d\u00e9t\u00e9rioration de la qualit\u00e9 de l\u2019eau, dont une perte d\u2019oxyg\u00e8ne, une augmentation consid\u00e9rable de la mati\u00e8re organique et la pr\u00e9sence de sulfates (5).<\/p>\n<p align=\"justify\">Globalement, les esp\u00e8ces fauniques et floristiques qui constituent les mangroves, sauf en cas extr\u00eame d\u2019accumulation menant \u00e0 un envasement complet, ne seront par directement impact\u00e9es par la pr\u00e9sence de ces algues. Il est probable que cette r\u00e9sistance provienne de la capacit\u00e9 des esp\u00e8ces floristiques des mangroves \u00e0 tirer profit des mati\u00e8res organiques et \u00e0 l\u2019eau de pluie arrivant du bassin versant qui chasse les sargasses du territoire (5).<\/p>\n<p align=\"justify\"><b>Faune aquatique<\/b><\/p>\n<p align=\"justify\">La d\u00e9t\u00e9rioration de la qualit\u00e9 de l\u2019eau, notamment la perte d\u2019oxyg\u00e8ne (2), induite par la pr\u00e9sence massive des sargasses et de leur d\u00e9composition, se r\u00e9percute sur les poissons vivants dans le littoral et peut aller jusqu\u2019\u00e0 la mort de ceux-ci (3).<\/p>\n<p align=\"justify\">L\u2019accumulation en couches des algues, limite la libre circulation des poissons, en plus d\u2019augmenter la turbidit\u00e9 de l\u2019eau (2).<\/p>\n<p align=\"justify\"><b>Tortues marines<\/b><\/p>\n<p align=\"justify\">Les amas de sargasses se retrouvant dans les lieux de pontes des tortues marines, esp\u00e8ces prot\u00e9g\u00e9es (1), perturbent la mont\u00e9e des femelles sur la plage pour la ponte (4) et g\u00eanent l\u2019\u00e9closion des b\u00e9b\u00e9s (3) ainsi que leur course vers l\u2019oc\u00e9an (4).<\/p>\n<p align=\"justify\"><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-2883 aligncenter\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20800%20302'%3E%3C\/svg%3E\" alt=\"\" width=\"800\" height=\"302\" data-lazy-src=\"..\/wp-content\/uploads\/sites\/16\/2018\/04\/20741808616_a0e813c3d0_k-e1524424910955.jpg\"><noscript><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"size-full wp-image-2883 aligncenter\" src=\"..\/wp-content\/uploads\/sites\/16\/2018\/04\/20741808616_a0e813c3d0_k-e1524424910955.jpg\" alt=\"\" width=\"800\" height=\"302\"><\/noscript><\/p>\n<p align=\"justify\"><b>Cons\u00e9quences du ramassage m\u00e9canique<\/b><\/p>\n<p align=\"justify\">Il ne faut pas omettre que les m\u00e9thodes employ\u00e9es pour \u00e9liminer les algues sargasses, tels que les moyens m\u00e9caniques, ont elles aussi un impact n\u00e9gatif sur les \u00e9cosyst\u00e8mes littoraux (5). En effet, de par le transport de la machinerie, le ramassage sur les plages provoque l\u2019\u00e9rosion des berges et saccage les nids des tortues (2).<\/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- ADEME, 2015. Collecte et valorisation des algues sargasses en Martinique Appel \u00e0 la manifestation d\u2019int\u00e9r\u00eat [PDF en ligne] : <a href=\"https:\/\/martinique.ademe.fr\/sites\/default\/files\/files\/Accueil\/ami-collecte-valorisation-algues-sargasses.pdf\">https:\/\/martinique.ademe.fr\/sites\/default\/files\/files\/Accueil\/ami-collecte-valorisation-algues-sargasses.pdf<\/a> Page consult\u00e9e le 27 mars 2018.<br \/>\n2-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 \/>\n3- DEAL Guadeloupe 2014, Note sargasses [PDF en ligne] : <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> Page consult\u00e9e le 27 mars 2018.<br \/>\n4- DEAL Guadeloupe, 2015. Les sargasses : questions\/r\u00e9ponses [PDF en ligne] : <a href=\"..\/IMG\/pdf\/Note_Sargasses__competences_DEAL_Direction_19_Juin2015.pdf\">http:\/\/www.guadeloupe.developpement-durable.gouv.fr\/IMG\/pdf\/Note_Sargasses__competences_DEAL_Direction_19_Juin2015.pdf<\/a> Page consult\u00e9e le 27 mars 2018.<br \/>\n5- 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.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>M\u00eame si les algues sargasses jouent un r\u00f4le important dans l\u2019environnement, celles-ci peuvent apporter leur lot de cons\u00e9quences n\u00e9fastes lorsque trop abondantes. L\u2019information qui suit fait la liste des principaux \u00e9cosyst\u00e8mes touch\u00e9s et des r\u00e9percussions \u00e9ventuelles dans leur environnement. Coraux et herbiers Lorsque les algues sargasses arrivent en masse, celles-ci s\u2019accumulent en couches pr\u00e8s des &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":[1549,1286],"class_list":["post-4863","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-sante-qualite-de-vie","tag-consequences-ecosystemiques-des-algues-sargasses","tag-sargasses"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cons\u00e9quences des algues sargasses sur les \u00e9cosyst\u00e8mes - 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