Ocean warming has been shrinking marine animals for 450 million years, massive study reveals
A massive study of 450 million years of fossil data confirms that marine animals consistently shrink during periods of intense global warming. This phenomenon, known as the 'Lilliput effect,' suggests that current ocean warming is driving a long-term biological trend toward smaller body sizes.
Why it matters
This research provides historical context for modern climate change impacts, suggesting that ocean warming has profound, long-lasting effects on marine biodiversity.
Marine animals do not just struggle when ocean temperatures spike, they actually shrink, and a massive new study shows this pattern has been repeating for nearly 450 million years. Researchers built one of the largest collections of marine body size data ever put together, drawing on almost 9,000 recorded changes and over 1.6 million individual measurements taken from fossils, historical records and living animals. What they found was striking, sea creatures shrank far more sharply during periods of intense global warming compared to crises caused by cooling or falling oxygen levels.
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