{"id":30627,"date":"2026-05-27T06:52:00","date_gmt":"2026-05-27T04:52:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=30627"},"modified":"2026-05-28T15:11:47","modified_gmt":"2026-05-28T13:11:47","slug":"les-planctons-a-lorigine-de-la-fermeture-des-plages-de-la-cote-bleue","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/05\/27\/les-planctons-a-lorigine-de-la-fermeture-des-plages-de-la-cote-bleue\/","title":{"rendered":"Les planctons \u00e0 l\u2019origine de la fermeture des plages de la C\u00f4te Bleue"},"content":{"rendered":"<div class=\"paragraph\">\n<p>C\u2019est un ph\u00e9nom\u00e8ne \u00ab\u00a0<i>un peu impressionnant<\/i><i>\u00a0<\/i>\u00bb, admet la directrice du Parc marin de la C\u00f4te Bleue Marie Bravo-Monin, simplement \u00ab\u00a0<i>li\u00e9 au printemps et aux conditions m\u00e9t\u00e9orologiques exceptionnelles<\/i><i>\u00a0<\/i>\u00bb. Ce week-end, les communes de Martigues, Sausset-les-Pins, Carry-le-Rouet et Ensu\u00e8s-la-Redonne ont pris des arr\u00eat\u00e9s interdisant la baignade \u00e0 la suite de \u00ab<i>\u00a0<\/i><i>blooms planctoniques<\/i>\u00a0\u00bb. Ces ph\u00e9nom\u00e8nes ne sont associ\u00e9s \u00e0 aucune \u00ab<i>\u00a0<\/i><i>toxicit\u00e9 connue<\/i>\u00a0\u00bb, pr\u00e9cise l\u2019Agence r\u00e9gionale de sant\u00e9 (ARS).<\/p>\n<p>Ce sont deux prises en charge pour cause de d\u00e9mangeaisons sur les plages de La Saulce et Sainte-Croix qui ont donn\u00e9 l\u2019alerte. \u00ab\u00a0<i>C\u2019est les sympt\u00f4mes d\u2019une petite algue tropicale, l\u2019Ostreopsis ovata qu\u2019on a sur le littoral mais dont on a jamais d\u00e9pass\u00e9 les seuils r\u00e9glementaires<\/i><i>\u00a0<\/i>\u00bb, explique Marie Bravo-Monin. Les pompiers ont ensuite \u00e9vacu\u00e9 les deux rives mart\u00e9gales de mani\u00e8re pr\u00e9ventive.<\/p>\n<p>\u00ab\u00a0<i>Les villes riveraines ont pr\u00e9f\u00e9r\u00e9 prendre leur pr\u00e9caution puisqu\u2019on \u00e9tait un jour f\u00e9ri\u00e9 et qu\u2019il \u00e9tait complexe d\u2019avoir des r\u00e9ponses dans l\u2019imm\u00e9diat<\/i>\u00a0\u00bb, explique le maire d\u2019Ensu\u00e8s Michel Illac (DVG). Le Service d\u00e9partemental d\u2019incendie et de secours des Bouches-du-Rh\u00f4ne a n\u00e9anmoins imm\u00e9diatement \u00e9cart\u00e9 toute pollution chimique.<\/p>\n<p>Ce mardi, les mairies d\u2019Ensu\u00e8s-la-Redonne, de Carry-le-Rouet et de Sausset-les-Pins ont finalement rouvert leurs plages \u00e0 la baignade. \u00ab\u00a0<i>Les r\u00e9sultats des analyses confirment \u00e0 la fois l\u2019absence de pollution organique (que l\u2019on pensait li\u00e9e \u00e0 l\u2019algue tropicale Ostreopsis ovata) ainsi que l\u2019absence de pollution chimique<\/i><i>\u00a0<\/i>\u00bb, affirme Michel Illac. La Ville de Martigues a quant \u00e0 elle engag\u00e9 une analyse bact\u00e9riologique des eaux en interne, dont les r\u00e9sultats ne sont pas encore connus. Les plages restent donc ferm\u00e9es.<\/p>\n<\/p><\/div>\n<div class=\"intext\"> Une situation d\u2019anoxie\n              <\/div>\n<div class=\"paragraph\">\n<p>S\u2019agissant du bloom planctonique, la directrice du Parc marin de la C\u00f4te Bleue explique\u00a0: \u00ab\u00a0<i>On se retrouve dans des conjonctions de courantologie, avec de l\u2019eau qui s\u2019est r\u00e9chauff\u00e9e tr\u00e8s rapidement, ce qui engendre la prolif\u00e9ration du plancton. Ce n\u2019est pas anormal pour la p\u00e9riode d\u2019avril\/mai. L\u00e0, c\u2019est d\u2019autant plus important au vu des temp\u00e9ratures et de l\u2019absence de vent, qui engendre moins de brassage de cette masse d\u2019eau qui se stratifie et devient donc toute verte \u00e0 cause de l\u2019anoxie des planctons. Ce qui mousse, c\u2019est la d\u00e9composition de ces \u00e9l\u00e9ments<\/i>.\u00a0\u00bb<\/p>\n<p>Pas de pollution, donc, mais un ph\u00e9nom\u00e8ne naturel amplifi\u00e9 par les conditions m\u00e9t\u00e9orologiques. Les relev\u00e9s montrent qu\u2019une pr\u00e9sence de planctons jusqu\u2019\u00e0 40 m\u00e8tres de profondeur. \u00ab\u00a0<i>D\u2019o\u00f9 l\u2019importance du mistral<\/i><i>\u00a0<\/i>\u00bb, glisse Marie Bravo-Monin.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"C&rsquo;est un ph&eacute;nom&egrave;ne &laquo;&nbsp;un peu impressionnant&nbsp;&raquo;, admet la directrice du Parc marin de la C&ocirc;te Bleue Marie Bravo-Monin, simplement &laquo;&nbsp;li&eacute; au printemps et aux conditions &#8230;","protected":false},"author":1,"featured_media":30628,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[918,3926,3925,333],"tags":[1129,67,10,109,63,657,116,164,1395],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-30627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil","category-accueil-merge","category-accueil-third","category-environnement","tag-ars","tag-baignade","tag-bouches-du-rhone","tag-littoral","tag-martigues","tag-michel-illac","tag-pollution","tag-resultats","tag-temperatures","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/30627","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=30627"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/30627\/revisions"}],"predecessor-version":[{"id":30629,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/30627\/revisions\/30629"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/30628"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=30627"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=30627"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=30627"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=30627"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=30627"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=30627"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=30627"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}