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Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought

Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought
Field photo of a Watsonulus fish fossil from the Gaopo section. / Photo de terrain d'un fossile de poisson Watsonulus (section de Gaopo). Credit: Xu Dai

About 250 million years ago, the Permian-Triassic mass extinction killed over 80% of the planet's species. In the aftermath, scientists believe that life on Earth was dominated by simple species for up to 10 million years before more complex ecosystems could evolve.

Now this longstanding theory is being challenged by a team of international researchers—including scientists from McGill University and Université du Québec à Montréal.

A fossilized ocean ecosystem

Until now, scientists have long theorized that scorching hot ocean conditions resulting from catastrophic climate change prevented the development of complex life after the mass . This idea is based on geochemical evidence of ocean conditions at the time.

Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought
Field photo of a fish fossil from the Baishuilong section. / Photo de terrain d'un fossile de poisson (section de Baishuilong). Credit: Xu Dai

Now, the discovery of fossils dating back 250.8 million years near the Guizhou region of China suggests that complex were present on Earth just 1 million years after the Permian-Triassic , which is much earlier than previously thought.

"The fossils of the Guizhou region reveal an ocean ecosystem with diverse species making up a complex food chain that includes plant life, boney fish, ray-finned fish, crabs, lobsters, shrimp, and mollusks. In all, our team discovered 12 classes of organisms and even found fossilized feces, revealing clues about the diets of these ancient animals," says Morgann Perrot, a former postdoctoral researcher at McGill University, now at Université du Québec à Montréal.

  • Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought
    Field photo of a Coelacanth fish fossil from the Gujiao section. / Photo de terrain d'un fossile de poisson cœlacanthe (section Gujiao). Credit: Xu Dai
  • Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought
    Rocks from the Guizhou region, deposited at the bottom of an ancient ocean during the Permian-Triassic transition and containing the newly discovered fossils (Gujiao section). Credit: Xu Dai

Challenging an age-old theory

Previously, it was thought that complex ecosystem would need 5 to 10 million years to evolve after an extinction. However, the researchers found that the specimens in the Guizhou region evolved much quicker than that by using to date the rocks where the fossils were discovered.

"All of this has implications for our understanding of how quickly life can respond to extreme crises. It also necessitates a re-evaluation of early Triassic conditions," says Perrot, whose research focuses on Earth sciences and geochronology.

More information: Xu Dai et al, A Mesozoic fossil lagerstätte from 250.8 million years ago showing a modern-type marine ecosystem, Science (2023). DOI: 10.1126/science.adf1622. www.science.org/doi/10.1126/science.adf1622

Journal information: Science

Provided by McGill University

Citation: Fossil discovery reveals complex ecosystems existed on Earth much earlier than previously thought (2023, February 9) retrieved 16 June 2024 from https://phys.org/news/2023-02-fossil-discovery-reveals-complex-ecosystems.html
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