{"id":9146,"date":"2026-07-29T03:08:25","date_gmt":"2026-07-29T07:08:25","guid":{"rendered":"https:\/\/martinique2050.com\/?p=9146"},"modified":"2026-08-01T03:11:35","modified_gmt":"2026-08-01T07:11:35","slug":"le-recul-des-coraux-sinscrit-desormais-dans-la-duree","status":"publish","type":"post","link":"https:\/\/martinique2050.com\/en\/le-recul-des-coraux-sinscrit-desormais-dans-la-duree\/","title":{"rendered":"The decline of coral reefs is now a long-term trend"},"content":{"rendered":"<div class=\"qMYqUG_convSearchResultHighlightRoot\">\n<div class=\"\" data-turn-id-container=\"request-6a4d418a-aae8-83ea-83ea-ade0a25b1da4-2\" data-is-intersecting=\"true\">\n<section class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [&amp;:has([data-writing-block])&gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-6a4d418a-aae8-83ea-83ea-ade0a25b1da4-2\" data-turn-id-container=\"request-6a4d418a-aae8-83ea-83ea-ade0a25b1da4-2\" data-testid=\"conversation-turn-38\" data-turn=\"assistant\">\n<div class=\"text-base my-auto mx-auto pb-8 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\">\n<div class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" data-conversation-screenshot-content=\"\">\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"a54e60c2-f2b3-49b7-8500-34b88d0f1185\" data-turn-start-message=\"true\" data-message-model-slug=\"gpt-5-6-thinking\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert wrap-break-word w-full dark markdown-new-styling\">\n<h4 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"57\" data-end=\"448\">Entre 2019 et 2025, le recouvrement corallien moyen a diminu\u00e9 de <strong data-start=\"122\" data-end=\"130\">61 %<\/strong> sur les cinq stations suivies en Martinique dans le cadre du r\u00e9seau GCRMN. Cette tendance montre que la d\u00e9gradation des r\u00e9cifs ne se limite pas aux deux \u00e9pisodes de blanchissement survenus en 2023 et 2024. Elle s\u2019inscrit dans une trajectoire plus longue, marqu\u00e9e par l\u2019accumulation de plusieurs pressions successives.<\/h4>\n<p data-start=\"450\" data-end=\"756\">En 2025, les communaut\u00e9s benthiques observ\u00e9es sur ces stations sont domin\u00e9es par les peuplements algaux. Trois sites pr\u00e9sentent alors une couverture corallienne inf\u00e9rieure \u00e0 <strong data-start=\"624\" data-end=\"633\">5,5 %<\/strong>, signe d\u2019un recul particuli\u00e8rement avanc\u00e9 des coraux sur une partie du r\u00e9seau suivi.<\/p>\n<hr \/>\n<h2 data-section-id=\"2h5mrh\" data-start=\"758\" data-end=\"814\">Une fragilisation engag\u00e9e avant les canicules marines<\/h2>\n<p data-start=\"816\" data-end=\"1104\">Les r\u00e9cifs martiniquais \u00e9taient d\u00e9j\u00e0 affaiblis avant les \u00e9pisodes de blanchissement de 2023 et 2024. Le bilan publi\u00e9 par l\u2019IFRECOR relie la tendance observ\u00e9e \u00e0 plusieurs ph\u00e9nom\u00e8nes, notamment \u00e0 la maladie de perte de tissu des coraux durs, connue sous le nom de SCTLD, entre 2019 et 2023.<\/p>\n<p data-start=\"1106\" data-end=\"1344\">Cette maladie a pr\u00e9c\u00e9d\u00e9 les deux canicules marines qui ont ensuite provoqu\u00e9 des blanchissements massifs aux Antilles fran\u00e7aises. Les coraux ont ainsi \u00e9t\u00e9 soumis \u00e0 une succession de perturbations, sans v\u00e9ritable p\u00e9riode prolong\u00e9e de r\u00e9pit.<\/p>\n<p data-start=\"1346\" data-end=\"1655\">Le blanchissement intervient lorsque des temp\u00e9ratures marines anormalement \u00e9lev\u00e9es placent les coraux en situation de stress. Mais dans le cas martiniquais, les \u00e9pisodes r\u00e9cents ne se sont pas produits sur des r\u00e9cifs indemnes. Ils ont touch\u00e9 des communaut\u00e9s d\u00e9j\u00e0 confront\u00e9es \u00e0 plusieurs ann\u00e9es de d\u00e9gradation.<\/p>\n<p data-start=\"1657\" data-end=\"1992\">Le rapport reste prudent sur les liens de causalit\u00e9 et indique que le recul mesur\u00e9 peut \u00eatre associ\u00e9 \u00e0 l\u2019effet cumul\u00e9 des maladies coralliennes et des blanchissements successifs. Il met toutefois en \u00e9vidence une continuit\u00e9 entre la fragilisation engag\u00e9e \u00e0 partir de 2019 et l\u2019\u00e9tat observ\u00e9 en 2025.<\/p>\n<h2 data-section-id=\"1maijya\" data-start=\"1994\" data-end=\"2035\">En 2025, les algues gagnent du terrain<\/h2>\n<p data-start=\"2037\" data-end=\"2184\">La baisse du recouvrement corallien ne se traduit pas seulement par la disparition de colonies. Elle modifie aussi la composition des fonds marins.<\/p>\n<p data-start=\"2186\" data-end=\"2506\">Sur les cinq stations martiniquaises suivies dans le cadre du r\u00e9seau GCRMN, les peuplements algaux dominent d\u00e9sormais les communaut\u00e9s benthiques. Cette \u00e9volution r\u00e9v\u00e8le un changement d\u2019\u00e9quilibre : \u00e0 mesure que la couverture corallienne diminue, les algues occupent une place plus importante sur les surfaces disponibles.<\/p>\n<p data-start=\"2508\" data-end=\"2727\">Trois stations pr\u00e9sentent une couverture corallienne inf\u00e9rieure \u00e0 5,5 %. Ces niveaux ne d\u00e9crivent pas l\u2019ensemble des r\u00e9cifs de l\u2019\u00eele, mais ils donnent une indication pr\u00e9cise de l\u2019\u00e9tat des sites concern\u00e9s par les suivis.<\/p>\n<p data-start=\"2729\" data-end=\"3082\">\u00c0 l\u2019\u00e9chelle des Antilles fran\u00e7aises, le rapport note \u00e9galement que certaines stations affichent en 2025 des recouvrements coralliens inf\u00e9rieurs \u00e0 5 %, les plus faibles enregistr\u00e9s depuis le d\u00e9but des observations. La Martinique s\u2019inscrit donc dans une d\u00e9gradation plus large des communaut\u00e9s r\u00e9cifales de l\u2019archipel.<\/p>\n<h2 data-section-id=\"975x6o\" data-start=\"3084\" data-end=\"3140\">Aucun retour aux niveaux ant\u00e9rieurs n\u2019appara\u00eet encore<\/h2>\n<p data-start=\"3142\" data-end=\"3431\">Le rapport n\u2019affirme pas que les r\u00e9cifs martiniquais sont d\u00e9finitivement incapables de se reconstituer. Les donn\u00e9es disponibles montrent toutefois qu\u2019en 2025, aucun retour vers les niveaux de recouvrement observ\u00e9s avant les crises r\u00e9centes n\u2019est encore visible sur les stations concern\u00e9es.<\/p>\n<p data-start=\"3433\" data-end=\"3703\">La succession des pressions complique la r\u00e9cup\u00e9ration. Apr\u00e8s plusieurs ann\u00e9es marqu\u00e9es par les maladies coralliennes, le blanchissement de 2023 a \u00e9t\u00e9 suivi d\u00e8s l\u2019ann\u00e9e suivante par un nouvel \u00e9pisode, plus intense \u00e0 l\u2019\u00e9chelle antillaise et \u00e9tendu sur pr\u00e8s de quatre mois.<\/p>\n<p data-start=\"3705\" data-end=\"3970\">Cette r\u00e9p\u00e9tition r\u00e9duit le temps dont disposent les communaut\u00e9s pour se stabiliser entre deux perturbations. Elle intervient aussi dans un contexte o\u00f9 la couverture corallienne est d\u00e9j\u00e0 faible et o\u00f9 les peuplements algaux sont devenus dominants sur plusieurs sites.<\/p>\n<p data-start=\"3972\" data-end=\"4280\">Les r\u00e9sultats observ\u00e9s entre 2019 et 2025 ne d\u00e9crivent donc plus uniquement les cons\u00e9quences de deux \u00e9v\u00e9nements exceptionnels. Ils t\u00e9moignent d\u2019une d\u00e9gradation install\u00e9e dans le temps, aliment\u00e9e par des pressions successives et par l\u2019absence, \u00e0 ce stade, d\u2019un r\u00e9tablissement visible sur les stations suivies.<\/p>\n<p data-start=\"4282\" data-end=\"4604\" data-is-last-node=\"\" data-is-only-node=\"\">En 2025, la faiblesse du recouvrement corallien et la progression des algues montrent que l\u2019\u00e9quilibre des r\u00e9cifs a profond\u00e9ment chang\u00e9. La question n\u2019est d\u00e9sormais plus seulement de mesurer les pertes apr\u00e8s chaque \u00e9pisode, mais de suivre la capacit\u00e9 de ces \u00e9cosyst\u00e8mes \u00e0 retrouver, ou non, une trajectoire de r\u00e9cup\u00e9ration.<\/p>\n<hr \/>\n<p data-start=\"4282\" data-end=\"4604\" data-is-last-node=\"\" data-is-only-node=\"\">\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Entre 2019 et 2025, le recouvrement corallien moyen a diminu\u00e9 de 61 % sur les cinq stations suivies en Martinique dans le cadre du r\u00e9seau GCRMN. Cette tendance montre que la d\u00e9gradation des r\u00e9cifs ne se limite pas aux deux \u00e9pisodes de blanchissement survenus en 2023 et 2024. Elle s\u2019inscrit dans une trajectoire plus longue, &hellip;<\/p>","protected":false},"author":3,"featured_media":9148,"comment_status":"closed","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":[1547],"tags":[],"class_list":["post-9146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biodiversite"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le recul des coraux s\u2019inscrit d\u00e9sormais dans la dur\u00e9e - martinique2050<\/title>\n<meta name=\"description\" content=\"Entre 2019 et 2025, le recouvrement corallien moyen a diminu\u00e9 de 61 % sur les cinq stations suivies en Martinique dans le cadre du r\u00e9seau GCRMN. 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