{"id":2846,"date":"2026-05-17T18:30:57","date_gmt":"2026-05-17T15:30:57","guid":{"rendered":"https:\/\/www.lbscience.org\/en\/2026\/05\/12\/standing-in-the-flames-the-adaptation-of-giants\/"},"modified":"2026-05-14T04:44:13","modified_gmt":"2026-05-14T01:44:13","slug":"taking-the-heat-the-adaptation-of-giants","status":"publish","type":"post","link":"https:\/\/www.lbscience.org\/en\/2026\/05\/17\/taking-the-heat-the-adaptation-of-giants\/","title":{"rendered":"Taking the Heat: The Adaptation of Giants"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Sequoia trees are among the largest and most impressive trees in the world. The trunk diameter of the giant sequoia, <\/span><i><span style=\"font-weight: 400;\">Sequoiadendron giganteum,<\/span><\/i><span style=\"font-weight: 400;\"> can reach about 10 meters, and they can stand up to about 90 meters tall. Sequoia trees can live to 3,000 years. They grow naturally in California\u2019s Sierra Nevada mountain range.<\/span><\/p>\n<div id=\"attachment_2849\" style=\"width: 1930px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2849\" class=\"wp-image-2849 size-full\" src=\"https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-scaled.jpg\" alt=\"\" width=\"1920\" height=\"2560\" srcset=\"https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-scaled.jpg 1920w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-225x300.jpg 225w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-768x1024.jpg 768w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-1152x1536.jpg 1152w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/\u05ea\u05de\u05d5\u05e0\u05d4-1-\u05e7\u05d8\u05e0\u05d4-1536x2048.jpg 1536w\" sizes=\"auto, (max-width: 1920px) 100vw, 1920px\" \/><p id=\"caption-attachment-2849\" class=\"wp-caption-text\">Image 1: Giant sequoia in snow, April 2026. Photo: Coral Cohen Zolkov<\/p><\/div>\n<p><span style=\"font-weight: 400;\">After widespread logging of sequoias, the United States established national parks to protect them [1], but real preservation requires more than that. Many Americans were raised on the saying <\/span><i><span style=\"font-weight: 400;\">\u201cPrevent forest fires,\u201d<\/span><\/i><span style=\"font-weight: 400;\"> meaning that every forest fire should be stopped, based on the idea that fires are inherently destructive. Today the approach has changed, and the emphasis is on preventing destructive, uncontrolled fires\u2014soon you will understand why.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Sequoias are coniferous trees that bear cones. Despite their enormous size, their cones are smaller than those of pine trees. Seeds, responsible for the tree\u2019s reproduction, are tucked between the cone scales. Cones can remain on the tree for many years, sometimes two decades, and only under certain conditions do they dry, open, and release their seeds, especially after exposure to high heat.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Just as various animals and plants have unique adaptations to their environment, sequoias have remarkably adapted\u2014to forest fires. Many tree species are fire-adapted: some, like eucalyptus, can regenerate rapidly after burning, and others germinate better following heat. Sequoias, however, stand out because they both survive fires exceptionally well and depend on them for natural regeneration.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We usually think of fire as a destructive process, and in many cases that is true, but for sequoias, natural fires\u2014most often ignited by lightning\u2014are part of the ecological system that allows them to exist. Fire heats and dries the cones, releasing the seeds, while simultaneously clearing the ground of competing vegetation and leaving bare soil suitable for germination [2]. Even so, only a tiny fraction of the seeds\u2014less than one percent\u2014will grow into trees. Without periodic fires, this percentage drops even further and sometimes there is almost no regeneration at all.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It is common to see dark areas and fire scars on sequoia trunks\u2014evidence that the tree was partially burned yet survived and continued to grow. How is this possible? Sequoia bark has a unique structure: it is very thick, fibrous, and full of air pockets. Air is a good thermal insulator, so heat moves slowly through the bark. Even when the outer layer heats up and chars, the temperature in the inner layers remains relatively low and does not damage the living tissues. In this sense, the bark is not merely \u201cfire-resistant\u201d; it is built so that heat cannot quickly penetrate inward.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In addition, the bark contains tannins\u2014phenolic compounds rich in relatively stable aromatic rings that contribute to fire resistance. Upon heating, tannins create a char layer on the surface that reduces heat transfer and blocks oxygen, thereby slowing further combustion [3]. Furthermore, sequoias produce a low amount of resin\u2014a flammable substance common in other conifers\u2014so there is less \u201cfuel\u201d to allow fire to spread.<\/span><\/p>\n<div id=\"attachment_2880\" style=\"width: 1090px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-2880\" class=\"wp-image-2880 size-full\" src=\"https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/35286.jpg\" alt=\"\" width=\"1080\" height=\"1293\" srcset=\"https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/35286.jpg 1080w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/35286-251x300.jpg 251w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/35286-855x1024.jpg 855w, https:\/\/www.lbscience.org\/en\/wp-content\/uploads\/sites\/3\/2026\/05\/35286-768x919.jpg 768w\" sizes=\"auto, (max-width: 1080px) 100vw, 1080px\" \/><p id=\"caption-attachment-2880\" class=\"wp-caption-text\">Image 2: A giant sequoia that survived a fire. Photo: Valery Paz. The woman standing before the tree in awe provides a sense of scale.<\/p><\/div>\n<p><span style=\"font-weight: 400;\">The tree needs the heat of fires to release seeds and regenerate, and in addition, it is also adapted to survive them. Over the years the trees even shed their lower branches, making it harder for ground fires to \u201cclimb\u201d up to the more sensitive parts of the tree. The cones need heat but not direct contact with flames.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For these reasons, park managers realized that not every fire in sequoia groves should be extinguished, and they began conducting prescribed fires to mimic the natural fire cycles on which the trees depend.<\/span><\/p>\n<p>Hebrew editing: Shir Rosenblum-Man<br \/>\nEnglish editing: Elee Shimshoni<\/p>\n<hr \/>\n<p><b>References:<\/b><\/p>\n<ol>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/www.nps.gov\/seki\/learn\/historyculture\/index.htm\"><span style=\"font-weight: 400;\">The history of Sequoia National Park<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\"><a href=\"https:\/\/www.nps.gov\/seki\/learn\/nature\/2fires.htm\"><span style=\"font-weight: 400;\">Wild or prescribed\u2014two kinds of fire<\/span><\/a><\/li>\n<li><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0165237023002553\">Review article on tannins as fire retardants<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Sequoia trees are among the largest and most impressive trees in the world. The trunk diameter of the giant sequoia, Sequoiadendron giganteum, can reach about 10 meters, and they can stand up to about 90 meters tall. Sequoia trees can live to 3,000 years. They grow naturally in California\u2019s Sierra Nevada mountain range. After widespread [&hellip;]<\/p>\n","protected":false},"author":236,"featured_media":2848,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6,10,14,17],"tags":[],"class_list":["post-2846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-biology","category-chemistry","category-climate","category-environment"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Taking the Heat: The Adaptation of Giants - Little, Big Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lbscience.org\/en\/?p=2846\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Taking the Heat: The Adaptation of Giants - Little, Big Science\" \/>\n<meta property=\"og:description\" content=\"Sequoia trees are among the largest and most impressive trees in the world. The trunk diameter of the giant sequoia, Sequoiadendron giganteum, can reach about 10 meters, and they can stand up to about 90 meters tall. Sequoia trees can live to 3,000 years. They grow naturally in California\u2019s Sierra Nevada mountain range. 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The trunk diameter of the giant sequoia, Sequoiadendron giganteum, can reach about 10 meters, and they can stand up to about 90 meters tall. Sequoia trees can live to 3,000 years. They grow naturally in California\u2019s Sierra Nevada mountain range. 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