{"id":39004,"date":"2026-08-11T08:04:00","date_gmt":"2026-08-11T06:04:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=39004"},"modified":"2026-08-18T07:24:13","modified_gmt":"2026-08-18T05:24:13","slug":"le-spectre-de-la-malaigue-plane-sur-letang","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/08\/11\/le-spectre-de-la-malaigue-plane-sur-letang\/","title":{"rendered":"Le spectre de la mala\u00efgue plane sur l\u2019\u00e9tang de Berre"},"content":{"rendered":"<div class=\"paragraph\">\n<p>Une nouvelle vague de chaleur place 22\u00a0d\u00e9partements en vigilance orange canicule, et il n\u2019y a pas que les Fran\u00e7ais qui en souffrent. La nature aussi. La temp\u00e9rature de l\u2019\u00e9tang de Berre atteint les 28\u00a0degr\u00e9s en son centre, et 30\u00a0degr\u00e9s \u00e0 proximit\u00e9 des plages. Un record, \u00ab\u00a0<i>surtout dans la dur\u00e9e du ph\u00e9nom\u00e8ne, qui a commenc\u00e9 mi-juin<\/i><i>\u00a0<\/i>\u00bb, souligne Rapha\u00ebl Grisel, directeur du syndicat en charge de la r\u00e9habilitation de la lagune, le Gipreb.<\/p>\n<p>Cette chaleur entra\u00eene des r\u00e9actions physiques et biochimiques en cascade, qui peuvent mener \u00e0 une asphyxie de l\u2019\u00e9tang. \u00ab\u00a0<i>L\u2019eau chaude contient d\u00e9j\u00e0 moins d\u2019oxyg\u00e8ne que l\u2019eau froide. Elle engendre des d\u00e9veloppements de phytoplanctons. On a des eaux tr\u00e8s vertes voire marron \u00e0 certains endroits. Ces phytoplanctons, aux cycles de vie tr\u00e8s court, s\u00e9dimentent le fond de l\u2019\u00e9tang et g\u00e9n\u00e8rent des d\u00e9gradations par les bact\u00e9ries pr\u00e9sentes, qui consomment de l\u2019oxyg\u00e8ne et r\u00e9duisent encore le volume d\u2019air dans l\u2019eau.<\/i><i>\u00a0<\/i>\u00bb<\/p>\n<p>En 2018, une situation similaire avait men\u00e9 \u00e0 une crise de mala\u00efgue d\u00e9vastatrice, qui avait touch\u00e9 93% de la surface de l\u2019\u00e9tang de Berre. Cette ann\u00e9e, certaines zones confin\u00e9es \u00e0 la pointe de Berre ou \u00e0 Saint-Chamas ont connu de tels \u00e9pisodes, mais globalement, la lagune tient le coup. \u00ab\u00a0<i>Le protocole <\/i>(qui interdit \u00e0 la centrale EDF les rejets d\u2019eau douce pendant les mois de juillet et ao\u00fbt, ndlr)<i> semble plut\u00f4t bien marcher, m\u00eame dans des situations critiques,<\/i> commente Rapha\u00ebl Grisel<i>. On a une temp\u00e9rature de l\u2019eau assez extr\u00eame mais la salinit\u00e9 est homog\u00e8ne et la stratification est assez peu pr\u00e9sente, gr\u00e2ce \u00e0 de petits coups de vent qui brassent et r\u00e9oxyg\u00e8nent<\/i>.\u00a0\u00bb<\/p>\n<p>\u00ab\u00a0<i>On peut esp\u00e9rer que \u00e7a tienne encore, mais s\u2019il n\u2019y a pas de gros coup de vent avec la vague de chaleur \u00e7a va devenir vraiment critique<\/i>, poursuit-il. <i>Chaque ann\u00e9e, les temp\u00e9ratures sont plus \u00e9lev\u00e9es. On voit o\u00f9 on va. Il faut continuer de mettre en \u0153uvre les mesures pour poursuivre la s\u00e9curisation de l\u2019\u00e9tat de l\u2019\u00e9tang en \u00e9t\u00e9 et aller plus loin. \u00c7a passe par la r\u00e9duction des apports en nutriment, que ce soit par les rivi\u00e8res ou EDF, et par la r\u00e9ouverture du tunnel du Rove, qui apportera des eaux marines qui seront plus fra\u00eeches et permettront de le climatiser<\/i>.\u00a0\u00bb<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"Une nouvelle vague de chaleur place 22&nbsp;d&eacute;partements en vigilance orange canicule, et il n&rsquo;y a pas que les Fran&ccedil;ais qui en souffrent. La nature aussi. La temp&eacute;rature de l&rsquo;&eacute;tang de Berre atteint les &#8230;","protected":false},"author":1,"featured_media":39005,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3926,3925,333],"tags":[4041,10,372,373,2612,532,1456,533,4158,4527,938,419,157,1453,1395],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-39004","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil-merge","category-accueil-third","category-environnement","tag-bacteries","tag-bouches-du-rhone","tag-canicule","tag-chaleur","tag-degradations","tag-edf","tag-etang-de-berre","tag-gipreb","tag-lagunes","tag-malaigue","tag-nature","tag-rechauffement-climatique","tag-rehabilitation","tag-saint-chamas","tag-temperatures","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/39004","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=39004"}],"version-history":[{"count":2,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/39004\/revisions"}],"predecessor-version":[{"id":39081,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/39004\/revisions\/39081"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/39005"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=39004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=39004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=39004"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=39004"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=39004"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=39004"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=39004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}