{"id":7325,"date":"2026-09-20T09:21:31","date_gmt":"2026-09-20T09:21:31","guid":{"rendered":"https:\/\/silvybrand.com\/?p=7325"},"modified":"2026-09-20T09:21:31","modified_gmt":"2026-09-20T09:21:31","slug":"tiny-hairs-that-help-corals-breathe-may-malfunction-in-warming-oceans","status":"publish","type":"post","link":"https:\/\/silvybrand.com\/?p=7325","title":{"rendered":"Tiny Hairs That Help Corals Breathe May Malfunction in Warming Oceans"},"content":{"rendered":"<p><br \/>\n<\/p>\n<div>\n<p class=\"paywall\">Every coral colony is cushioned by a thin boundary layer of water whose movement is slowed by friction at the coral\u2019s surface. Researchers assumed that corals were passive with respect to the slow-moving boundary layer, simply relying on natural diffusion through it to provide nutrients and oxygen.<\/p>\n<p class=\"paywall\">Then, in 2014, a team from the Massachusetts Institute of Technology and the Weizmann Institute of Science <a href=\"https:\/\/www.pnas.org\/doi\/10.1073\/pnas.1323094111\" target=\"_blank\" class=\"text link\">published a groundbreaking study<\/a> showing that coral cilia interact with the boundary layer by rapidly whipping about to generate swirls of fresh, oxygenated seawater. Until a decade ago, scientists thought of these cilia merely as brooms that move mucus and sweep away waste particles and other debris. The research not only modeled the tiny vortices created by the cilia for the first time, but also revealed the cilia\u2019s importance for survival and metabolism.<\/p>\n<p class=\"paywall\">At first, the microbiologist and environmental engineer Orr Shapiro, who led the 2014 work at MIT as a postdoctoral fellow, was interested in how microbes that infect corals and cause disease follow concentration gradients, a process called chemotaxis. Under the microscope, he noticed something weird: In the boundary layer, particles were swirling around and mixing together\u2014not at all like the passive diffusion he had been expecting.<\/p>\n<p class=\"paywall\">\u201cThat was to me, and I think later on to the entire field, sort of a paradigm shift,\u201d said Shapiro, now a researcher at the Volcani Institute in Israel. It became clear that the boundary layer wasn\u2019t static, but rather a dynamic zone, and one where cilia were creating their own turbulence. The realization inspired Shapiro\u2019s team to go off on a tangent, mapping the flow of oxygen to coral tissues via cilia. \u201cIt really transformed how we understand this [micro]environment, because suddenly the diffusion is no longer really important,\u201d Shapiro said.<\/p>\n<p class=\"paywall\">Diffusion is the default route for nutrients traveling through water, but it\u2019s painfully slow. It can take as long as four minutes for oxygen to travel just 1 millimeter. That\u2019s why the fast-moving flows created by cilia are so important: because naturally flowing water slows down near the coral\u2019s surface, and corals consume oxygen faster than diffusion can supply it.<\/p>\n<p class=\"paywall\">It is a system that delivers enough oxygen, despite the cilia\u2019s energy consumption. But there\u2019s a downside: Oxygen dwindles as temperature climbs. That\u2019s when corals run into trouble.<\/p>\n<p class=\"paywall\"><span class=\"lead-in-text-callout\">Scientists have a<\/span> clear understanding of one thing that happens to corals when <a href=\"https:\/\/www.wired.com\/story\/the-earth-is-nearing-an-environmental-tipping-point\/\" class=\"text link\">water gets too hot<\/a>: bleaching. As water temperatures rise, a coral\u2019s <a href=\"https:\/\/www.wired.com\/story\/reflecting-pool-full-of-algae-climate-change\/\" class=\"text link\">symbiotic algae<\/a> become stressed and release molecules that are toxic to the coral in large quantities. To protect itself, the coral expels its own algae\u2014a primary food, energy, and oxygen source\u2014and soon loses its color. It\u2019s a slow death and an increasingly common occurrence as <a href=\"https:\/\/www.wired.com\/story\/the-oceans-just-keep-getting-hotter\/\" class=\"text link\">heat waves<\/a> sweep across the world\u2019s reefs.<\/p>\n<p class=\"paywall\">But sometimes, some corals on a reef bleach while others don\u2019t, and in other cases corals under heat stress die without expelling their algae. An international team of microbiologists, engineers, and physiologists was eager to understand how heat affects cilia, and whether this could explain different types of coral death.<\/p>\n<\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/www.wired.com\/story\/tiny-hairs-that-help-corals-breathe-may-malfunction-in-warming-oceans\/\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Every coral colony is cushioned by a thin boundary layer of water whose movement is slowed by friction at the coral\u2019s surface. Researchers assumed that corals were passive with respect to the slow-moving boundary layer, simply relying on natural diffusion through it to provide nutrients and oxygen. Then, in 2014, a team from the Massachusetts [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7326,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[96,1394,1346,305,1086],"class_list":["post-7325","post","type-post","status-publish","format-standard","has-post-thumbnail","category-gadgets","tag-climate-change","tag-corals","tag-global-warming","tag-oceans","tag-quanta-magazine"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Tiny Hairs That Help Corals Breathe May Malfunction in Warming Oceans - Silvybrand Lifestyle Blog<\/title>\n<meta name=\"description\" content=\"Several new studies have uncovered this long overlooked aspect of coral physiology that could be the key to the animals\u2019 fate in a changing climate.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/silvybrand.com\/?p=7325\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Tiny Hairs That Help Corals Breathe May Malfunction in Warming Oceans - 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