{"id":149387,"date":"2025-09-11T16:53:11","date_gmt":"2025-09-11T16:53:11","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/149387\/"},"modified":"2025-09-11T16:53:11","modified_gmt":"2025-09-11T16:53:11","slug":"what-scientists-just-found-on-shark-teeth-could-mean-bad-news-for-the-ocean","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/149387\/","title":{"rendered":"What scientists just found on shark teeth could mean bad news for the ocean"},"content":{"rendered":"

Even the fiercest predators in the sea aren\u2019t immune to climate change\u2014and their weakness may lie in a place no one expected.<\/p>\n

Sharks<\/a> have earned their fearsome reputation thanks to jaws lined with razor-sharp teeth that regenerate constantly. It\u2019s this endless renewal that gives them an edge: without it, they\u2019d be powerless to hunt. But in a rapidly changing ocean, even this clever survival trick might not be enough.<\/p>\n

A team from Germany\u2019s Heinrich Heine University in D\u00fcsseldorf (HHU) has been studying blacktip shark teeth in different acidification scenarios, and their findings\u2014published in Frontiers in Marine Science\u2014are sounding the alarm. The more acidic the water, the more the teeth begin to deteriorate.<\/p>\n

\u201cThese are natural weapons made to tear through flesh\u2014not to survive ocean acid,\u201d said Maximilian Baum, a biologist at HHU and the study\u2019s lead author.<\/p>\n

\"\"<\/p>\n

A blacktip reef shark at Sealife Oberhausen, where the researchers collected the teeth for study. \u00a9 Maximilian Baum<\/p>\n

Hidden damage that\u2019s easy to miss<\/p>\n

Right now, the average pH of ocean water is around 8.1. But thanks to rising CO\u2082 emissions<\/a>, that number could drop to 7.3 by the year 2300\u2014making the ocean nearly ten times more acidic. To get a glimpse of this possible future, researchers gathered over 600 discarded shark teeth from an aquarium tank that housed blacktip sharks.<\/p>\n

Sixteen intact teeth were selected for an eight-week trial in separate 20-liter tanks\u2014some in normal pH 8.1 water, others in highly acidic pH 7.3. Another 36 teeth were measured before and after exposure.<\/p>\n

The outcome was striking. Compared to those kept in neutral water, the teeth in acidic conditions developed cracks, holes, root erosion, and visible signs of structural decay. Even the shape changed. 2D imaging revealed that the teeth had wider circumferences\u2014not from growth, but because the surface had become uneven and rough.<\/p>\n

\"\"<\/p>\n

Assessment of tooth base damage. To assess the overall condition of the base, teeth were classified as (A) 1 = no damage, (B) 2 = minor damage, (C) 3 = moderate damage, (D) 4 = significant damage. \u00a9 M. Baum et al. 2025<\/p>\n

That uneven surface creates a strange double-edged sword. While a rougher texture might improve the tooth\u2019s slicing ability, it also makes it weaker\u2014more likely to crack and break.<\/p>\n

A threat to survival<\/p>\n

The study, which started as an undergraduate research project, ended up as a peer-reviewed publication. \u201cIt shows how valuable student-led research can be. Curiosity and initiative often lead to major insights,\u201d noted Professor Sebastian Fraune, head of HHU\u2019s Institute of Zoology and Organismic Interactions.<\/p>\n

Importantly, the study was done using non-living, mineralized teeth that couldn\u2019t repair themselves. In the wild, living sharks might be able to remineralize or grow new teeth\u2014but in more acidic waters, that natural fix could take more energy than it\u2019s worth. Future research will need to dive deeper into the chemical composition, physical changes, and resilience of living shark teeth.<\/p>\n

The concern is especially urgent for species like blacktip sharks, which swim with their mouths open\u2014leaving their teeth in constant contact with seawater. Even a slight dip in pH could cause gradual but damaging effects, particularly for species that don\u2019t replace teeth as quickly. And even microscopic damage could be enough to interfere with their ability to hunt.<\/p>\n

\u201cHolding the ocean\u2019s pH close to today\u2019s average of 8.1 might be critical to keeping predator tools intact,\u201d Baum warned. \u201cIt\u2019s a powerful reminder that climate change<\/a> has cascading effects across entire food webs and marine ecosystems.\u201d<\/p>\n

If the teeth of top predators are already showing signs of wear, what other essential features of marine life might start failing next? And more importantly\u2014are we ready for what happens when these hidden cracks start spreading?<\/p>\n

\"\"<\/p>\n

\t\t\t C\u00e9cile Breton <\/p>\n

\n Journalist <\/p>\n

Since childhood, books, photography, and travel have been part of my world. Fascinated by life, by the stars, by landscapes that tell stories without a single word, I quickly realized that I needed to express what I saw and felt.<\/p>\n

Passionate about the world around me, I first pursued a degree in History at university, driven by my fascination with the stories of the past and the great civilizations that shaped our world. But over the years, another truth became clear: I didn\u2019t want to spend my life in archives or research. I wanted to be out in the field, behind a camera or in front of a microphone, sharing what I learned.<\/p>\n

So, I took a new path. I chose journalism, to learn how to tell stories differently\u2014with rigor and clarity. I learned how to write, to interview, to edit, to capture both attention and emotion.<\/p>\n

Giving meaning and sharing what matters<\/p>\n

Since then, I\u2019ve worked across different media: print, web, radio, television, and video. All of this has allowed me to bring to life topics that matter deeply to me: nature, animals, space, and the major environmental and human issues of our time.<\/p>\n

Today, I continue my journey as a journalist at Futura. As part of the editorial team, I strive to share knowledge with curiosity, clarity, and passion. My guiding thread? To make visible what deserves to be seen, understood, and shared\u2014and to keep my sense of wonder alive.<\/p>\n

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