{"id":4856,"date":"2026-01-06T15:56:34","date_gmt":"2026-01-06T14:56:34","guid":{"rendered":"https:\/\/martinique2050.com\/cest-quoi-les-algues-sargasses-fiche-technique\/"},"modified":"2026-07-13T14:14:06","modified_gmt":"2026-07-13T18:14:06","slug":"cest-quoi-les-algues-sargasses-fiche-technique","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/cest-quoi-les-algues-sargasses-fiche-technique\/","title":{"rendered":"C\u2019est quoi les algues sargasses? (Fiche technique)"},"content":{"rendered":"<div class=\"entry-content\">\n<p align=\"justify\"><b>Une algue sargasse, qu\u2019est-ce que c\u2019est ? Quel est sont mode de fonctionnement, de reproduction et d\u2019alimentation ? De la naissance jusqu\u2019\u00e0 sa d\u00e9composition, cette fiche technique r\u00e9sume quelques caract\u00e9ristiques de cette famille v\u00e9g\u00e9tale.<\/b><\/p>\n<p align=\"justify\"><b>Les algues<\/b><\/p>\n<p align=\"justify\">Les algues sont des plantes aquatiques qui constituent la premi\u00e8re forme de vie \u00e0 appara\u00eetre sur la terre. Il en existe une multitude d\u2019esp\u00e8ces, vivant en eau douce ou sal\u00e9e, mais qui font toutes de la photosynth\u00e8se puisqu\u2019elles poss\u00e8dent de la chlorophylle. Elles font partie du groupe des thallophytes, c\u2019est \u00e0 dire qu\u2019elles ne poss\u00e8dent ni tige, ni feuille, ni racine, mais un corps nomm\u00e9 le thalle (5).<\/p>\n<p align=\"justify\"><b>Les algues sargasses<\/b><\/p>\n<p align=\"justify\">Contrairement aux algues qui s\u2019accrochent \u00e0 un substrat, les sargasses sont des algues brunes (1) qui vivent en pleine mer. On dit alors qu\u2019elles sont p\u00e9lagiques (2). Deux esp\u00e8ces, Sargassum<i> natans <\/i>et <i>Sargassum<\/i><i> fluitans<\/i>, se retrouvent fr\u00e9quemment dans les Cara\u00efbes (1).<\/p>\n<div id=\"attachment_2876\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" aria-describedby=\"caption-attachment-2876\" class=\"wp-image-2876 size-full\" src=\"data:image\/svg+xml,%3Csvg%20xmlns='http:\/\/www.w3.org\/2000\/svg'%20viewBox='0%200%20800%20339'%3E%3C\/svg%3E\" alt=\"\" width=\"800\" height=\"339\"><noscript><\/noscript><\/p>\n<p id=\"caption-attachment-2876\" class=\"wp-caption-text\"><em>Sargassum natans<\/em> \u00e0 gauche et <em>Sargassum fluitans<\/em> \u00e0 droite. Copyright photo by GCRL (Gulf Coast research laboratory) <a href=\"http:\/\/gcrl.usm.edu\/sargassum\/sargassum.identification.guide.php\">http:\/\/gcrl.usm.edu\/sargassum\/sargassum.identification.guide.php<\/a><\/p>\n<\/div>\n<p align=\"justify\"><b>Morphologie de <i>S.<\/i><i> natans <\/i>et<i> <\/i><i>S<\/i><i>. fluitans<\/i><\/b><\/p>\n<p align=\"justify\">Ces deux macroalgues se ressemblent beaucoup. Leurs nombreuses thalles, petites et dent\u00e9es (1) poss\u00e8dent des branches ramifi\u00e9es comprenant plusieurs a\u00e9rocytes, des flotteurs remplis de gaz qui permettent leur flottaison (4). D\u2019une taille variant de 50 cm \u00e0 1 m\u00e8tre, ces algues asym\u00e9triques ne poss\u00e8dent pas d\u2019axe principal, mais forment un amas de \u00ab branches \u00bb (1).<\/p>\n<p align=\"justify\"><b>Mode de reproduction<\/b><\/p>\n<p align=\"justify\"><i>S. fluitans<\/i> et <i>S. natans<\/i> vont se multiplier principalement par la fragmentation de leur thalle (4), chacun des fragments ayant par la suite le pouvoir de grandir et de se refragmenter pour former d\u2019autres thalles et ainsi de suite (1). La teneur en nutriments pr\u00e9sente dans l\u2019eau leur permet une croissance plus ou moins rapide (4). Leur capacit\u00e9 d\u2019absorption des nutriments est beaucoup plus importante que celle des v\u00e9g\u00e9taux terrestres (1)<\/p>\n<p align=\"justify\"><b>Composition chimique<\/b><\/p>\n<p align=\"justify\">La famille des sargasses sont des algues g\u00e9n\u00e9ralement compos\u00e9es de 70 % \u00e0 90 % d\u2019eau. La mati\u00e8re s\u00e8che est compos\u00e9e de 10 % \u00e0 40 % de min\u00e9raux. Elles ont une grande capacit\u00e9 d\u2019accumulation des m\u00e9taux lourds (1).<\/p>\n<p align=\"justify\"><b>D\u00e9composition<\/b><\/p>\n<p align=\"justify\">De part leurs nombreuses ramifications qui partent dans tous les sens, une d\u00e9composition a\u00e9robie (en pr\u00e9sence d\u2019oxyg\u00e8ne) des sargasses serait pr\u00e9sum\u00e9e. Toutefois l\u2019entassement de celles-ci, lors d\u2019\u00e9chouages importants, les privant d\u2019oxyg\u00e8ne, oblige une d\u00e9composition ana\u00e9robie (sans oxyg\u00e8ne) produisant l\u2019\u00e9mission de gaz, principalement de sulfure d\u2019hydrog\u00e8ne (H<sub>2<\/sub>S) (4). L\u2019H<sub>2<\/sub>S est incolore, poss\u00e8de une densit\u00e9 sup\u00e9rieure \u00e0 celle de l\u2019air et une odeur d\u2019\u0153uf pourri (1).<\/p>\n<p style=\"text-align: right\">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- Caribbean Hotel &amp; Tourism Association, 2016. Sargasse : Un guide pratique pour la Cara\u00efbe Traduit de l\u2019anglais par Fran\u00e7oise Miranne-Parole et Nady Vial-Cabrera, responsable de la Coop\u00e9ration Internationale. DEAL Guadeloupe. [PDF en ligne] : <a href=\"..\/IMG\/pdf\/CAST_VF_pdf.pdf\">http:\/\/www.guadeloupe.developpement-durable.gouv.fr\/IMG\/pdf\/CAST_VF_pdf.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- 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 \/>\n5- 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>Une algue sargasse, qu\u2019est-ce que c\u2019est ? Quel est sont mode de fonctionnement, de reproduction et d\u2019alimentation ? De la naissance jusqu\u2019\u00e0 sa d\u00e9composition, cette fiche technique r\u00e9sume quelques caract\u00e9ristiques de cette famille v\u00e9g\u00e9tale. Les algues Les algues sont des plantes aquatiques qui constituent la premi\u00e8re forme de vie \u00e0 appara\u00eetre sur la terre. Il &hellip;<\/p>","protected":false},"author":1,"featured_media":4616,"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":[1546,1286],"class_list":["post-4856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","category-sante-qualite-de-vie","tag-fiche-technique","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>C\u2019est quoi les algues sargasses? 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