{"id":37365,"date":"2026-05-20T19:50:00","date_gmt":"2026-05-20T19:50:00","guid":{"rendered":"https:\/\/www.tun.com\/home\/?p=37365"},"modified":"2026-05-20T18:50:40","modified_gmt":"2026-05-20T18:50:40","slug":"warming-oceans-disrupt-coral-oxygen-supply-study-finds","status":"publish","type":"post","link":"https:\/\/www.tun.com\/home\/warming-oceans-disrupt-coral-oxygen-supply-study-finds\/","title":{"rendered":"Warming Oceans Disrupt Coral Oxygen Supply, Study Finds"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<div class=\"wp-block-uagb-blockquote uagb-block-e7eb3fc3 uagb-blockquote__skin-border uagb-blockquote__stack-img-none\"><blockquote class=\"uagb-blockquote\"><div class=\"uagb-blockquote__content\">New research from the University of Copenhagen has identified a previously unknown mechanism linking ocean warming to coral death \u2014 microscopic hair-like structures that help corals &#8220;breathe&#8221; break down under heat stress, cutting off their oxygen supply.<\/div><footer><div class=\"uagb-blockquote__author-wrap uagb-blockquote__author-at-left\"><\/div><\/footer><\/blockquote><\/div>\n\n\n\n<div class=\"wp-block-group is-content-justification-space-between is-nowrap is-layout-flex wp-container-core-group-is-layout-b0ffac9c wp-block-group-is-layout-flex\"><div style=\"font-size:16px\" class=\"has-text-align-left wp-block-post-author\"><div class=\"wp-block-post-author__content\"><p class=\"wp-block-post-author__name\">The University Network<\/p><\/div><\/div>\n\n\n<div class=\"wp-block-uagb-social-share uagb-social-share__outer-wrap uagb-social-share__layout-horizontal uagb-block-ee584a31\">\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-ec619ce7\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/www.facebook.com\/sharer.php?u=\" tabindex=\"0\" role=\"button\" aria-label=\"facebook\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256c0 123.8 90.69 226.4 209.3 245V327.7h-63V256h63v-54.64c0-62.15 37-96.48 93.67-96.48 27.14 0 55.52 4.84 55.52 4.84v61h-31.28c-30.8 0-40.41 19.12-40.41 38.73V256h68.78l-11 71.69h-57.78V501C413.3 482.4 504 379.8 504 256z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-32d99934\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/twitter.com\/share?url=\" tabindex=\"0\" role=\"button\" aria-label=\"twitter\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\"><path d=\"M389.2 48h70.6L305.6 224.2 487 464H345L233.7 318.6 106.5 464H35.8L200.7 275.5 26.8 48H172.4L272.9 180.9 389.2 48zM364.4 421.8h39.1L151.1 88h-42L364.4 421.8z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n\n\n\n<div class=\"wp-block-uagb-social-share-child uagb-ss-repeater uagb-ss__wrapper uagb-block-1d136f14\"><span class=\"uagb-ss__link\" data-href=\"https:\/\/www.linkedin.com\/shareArticle?url=\" tabindex=\"0\" role=\"button\" aria-label=\"linkedin\"><span class=\"uagb-ss__source-wrap\"><span class=\"uagb-ss__source-icon\"><svg xmlns=\"https:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 448 512\"><path d=\"M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3zM135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5 0 21.3-17.2 38.5-38.5 38.5zm282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5 67.2 0 79.7 44.3 79.7 101.9V416z\"><\/path><\/svg><\/span><\/span><\/span><\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Coral reefs, which support more biodiversity than virtually any other ocean ecosystem, are in deeper trouble than scientists previously understood. A new study <a href=\"https:\/\/www.science.org\/doi\/10.1126\/sciadv.aeg0950\" target=\"_blank\" rel=\"noopener\" title=\"\">published<\/a> in <em>Science Advances<\/em> has uncovered a hidden biological mechanism through which rising ocean temperatures can starve corals of oxygen \u2014 and potentially kill them before the more familiar warning sign of bleaching even appears.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Researchers at the University of Copenhagen, in collaboration with scientists from institutions across Europe, Australia and Saudi Arabia, used a combination of laboratory experiments and mathematical modeling to examine how tiny, hair-like cellular structures called cilia help corals absorb oxygen from surrounding seawater \u2014 and how heat disrupts that process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Corals Actually Breathe<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Corals lack a dedicated respiratory system, and were long assumed to absorb oxygen passively from seawater. The new research challenges that assumption. The surface of a coral is blanketed by thousands of microscopic cilia, each about 10 to 15 micrometers long and roughly 500 times thinner than a human hair. When these cilia beat in a synchronized pattern, they generate small but critical water movements just above the coral surface. At night \u2014 when corals cannot rely on their photosynthesizing symbiotic algae for oxygen \u2014 this ciliary-driven circulation is their primary means of obtaining the oxygen they need to survive.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under moderately elevated water temperatures, corals were found to ramp up their ciliary activity to compensate for higher metabolic oxygen demand \u2014 essentially breathing harder as conditions worsen.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;In this temperature range, corals can compensate for higher oxygen demand by effectively increasing their &#8216;breathing&#8217;. However, this compensatory mechanism does not persist at higher temperatures,&#8221; first author Cesar Pacherres, an assistant professor in the Department of Biology at the University of Copenhagen, said in a news release.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">A Breaking Point at 37 Degrees<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Beyond a certain thermal threshold, however, the system collapses. In laboratory experiments, ciliary motion began to falter as temperatures climbed, with the cilia slowing down, losing their coordinated rhythm and eventually ceasing to move altogether. In the experiments, this breakdown occurred at approximately 37 degrees Celsius. With cilia no longer functioning, the thin layer of water directly above the coral surface became progressively depleted of oxygen even as the coral&#8217;s tissue continued consuming more of it. The result was acute oxygen stress, tissue breakdown and, ultimately, death.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The researchers are careful to note that the 37-degree threshold is not a universal number. Depending on local ocean conditions, the evolutionary history of a particular reef and the specific coral species involved, this critical point could be reached at lower temperatures \u2014 making some reefs more vulnerable than the experiments alone might suggest.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A New Window Into Coral Bleaching<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The findings also shed new light on coral bleaching, the widely documented phenomenon in which corals expel their symbiotic algae under thermal stress, losing both their color and a primary energy source. The study suggests that oxygen stress and bleaching are not separate events but deeply intertwined processes.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;As temperatures rise, the coral&#8217;s metabolism and oxygen demand increase. If the cilia&#8217;s ability to transport oxygen is impaired at the same time, the coral experiences oxygen stress precisely when it is under the greatest physiological pressure,&#8221; added senior author Michael K\u00fchl, a professor in the Department of Biology at the University of Copenhagen.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">In some cases, oxygen-driven tissue damage may occur and even cause death before bleaching becomes externally visible \u2014 meaning scientists and conservationists relying on bleaching as an early-warning signal could be missing coral distress that is already underway.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why It Matters<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">&#8220;Marine heatwaves are becoming more frequent and intense as a result of global warming, affecting coral reefs worldwide. At the same time, oxygen levels in the oceans are declining. Both changes are critical for marine life, and our study identifies a mechanism that directly links ocean warming and oxygen loss, which in the worst case can lead to rapid coral death,&#8221; K\u00fchl added.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">Coral reefs cover less than 1% of the ocean floor but support an estimated 25% of all marine species. They also provide coastal protection and food security for hundreds of millions of people globally \u2014 making their decline an urgent concern far beyond the marine biology community.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The team&#8217;s mathematical model adds a predictive dimension to the findings. By simulating how different environmental conditions and coral metabolic rates interact, the model can identify which scenarios push corals toward dangerous oxygen deficits fastest \u2014 a tool that could help prioritize conservation and reef restoration efforts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The implications extend beyond coral reefs as well. Sponges, sea anemones, sea squirts and many other marine organisms also use cilia to manage water flow and oxygen uptake. The mechanism identified in this study could be relevant across a broad range of species already under pressure from warming and deoxygenating seas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">As Pacherres noted, local interventions informed by this research \u2014 such as targeted reef restoration \u2014 can help, but the scale of the threat demands a broader response. Preventing widespread coral loss, the researchers emphasize, ultimately requires significant reductions in global greenhouse gas emissions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The study was supported by the Gordon and Betty Moore Foundation&#8217;s Aquatic Symbiosis Initiative, with additional funding from the Novo Nordisk Foundation, the Leibniz Association, the Australian Research Council and an EU MSCA postdoctoral fellowship. Research was led by the University of Copenhagen in collaboration with the Leibniz Institute for Baltic Sea Research, the University of Melbourne and King Abdullah University of Science and Technology.<\/p>\n\n\n\n<div style=\"height:9px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"source-attribution wp-block-paragraph\"><strong>Source: <\/strong><a href=\"https:\/\/news.ku.dk\/all_news\/2026\/05\/warming-oceans-can-disrupt-coral-oxygen-supply-and-trigger-coral-death\/\" target=\"_blank\" rel=\"noopener\" title=\"\">University of Copenhagen<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>New research from the University of Copenhagen has identified a previously unknown mechanism linking ocean warming to coral death \u2014 microscopic hair-like structures that help corals &#8220;breathe&#8221; break down under heat stress, cutting off their oxygen supply.<\/p>\n","protected":false},"author":3,"featured_media":37537,"comment_status":"open","ping_status":"open","sticky":false,"template":"single-no-separators","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[11],"tags":[2184,1024,1047,2179,2183,969,2181,1021,2182,2180,101,93],"class_list":["post-37365","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate-and-environment","tag-australian-research-council","tag-biodiversity","tag-climate-change","tag-coral-reefs","tag-gordon-and-betty-moore-foundation","tag-kaust","tag-leibniz-institute-for-baltic-sea-research","tag-marine-biology","tag-novo-nordisk-foundation","tag-ocean-warming","tag-university-of-copenhagen","tag-university-of-melbourne"],"acf":[],"aioseo_notices":[],"uagb_featured_image_src":{"full":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds.png",1536,1024,false],"thumbnail":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds-150x150.png",150,150,true],"medium":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds-300x200.png",300,200,true],"medium_large":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds-768x512.png",768,512,true],"large":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds-1024x683.png",1024,683,true],"1536x1536":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds.png",1536,1024,false],"2048x2048":["https:\/\/www.tun.com\/home\/wp-content\/uploads\/2026\/05\/37365-warming-oceans-disrupt-coral-oxygen-supply-study-finds.png",1536,1024,false]},"uagb_author_info":{"display_name":"The University Network","author_link":"https:\/\/www.tun.com\/home\/author\/funky_junkie\/"},"uagb_comment_info":0,"uagb_excerpt":"New research from the University of Copenhagen has identified a previously unknown mechanism linking ocean warming to coral death \u2014 microscopic hair-like structures that help corals \"breathe\" break down under heat stress, cutting off their oxygen supply.","_links":{"self":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/37365","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/comments?post=37365"}],"version-history":[{"count":6,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/37365\/revisions"}],"predecessor-version":[{"id":37392,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/posts\/37365\/revisions\/37392"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/media\/37537"}],"wp:attachment":[{"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/media?parent=37365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/categories?post=37365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tun.com\/home\/wp-json\/wp\/v2\/tags?post=37365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}