Ozone depletion may have triggered a mass die-off of ancient fish and plants by ultraviolet ray exposure 358 million years ago.
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RESTRICTIONS: Broadcast: NO USE JAPAN, NO USE TAIWAN Digital: NO USE JAPAN, NO USE TAIWAN Ozone depletion may have triggered a mass die-off of ancient fish and plants by ultraviolet ray exposure 358 million years ago, according to a new study in Science Advances.
Science Magazine reports the research team took a "perfect" six-meter-long mudstone drilled core.
Preserved in the sample were spores from land plants that had flourished in the Devonian period, when Greenland was part of the Old Redstone Continent.
According to the study, the fossilized spores showed a transition from healthy, normal spores to malformed and blackened spores.
The deformities observed strongly suggest the parent plants suffered DNA damage from high levels of ultraviolet-B rays.
The spores dated to the Late Devonian die-off, the second mass extinction in the period that saw the disappearance of many species, including giant armored sharks.
The descendants of the surviving bony fish and sharks would populate today's oceans.
Importantly, the second-wave extinction wiped out the first four-limbed fish that had ventured onto land.
This means another group of five-toed tetrapods became the precursor of land animals.
RUNDOWN SHOWS: 1.
Ozone depletion and UV ray exposure caused second Devonian extinction 2.
Study utilizes fossilized spores in mudstone sample 3.
Spore fossils show signs of radiation damage and deformity 4.
Die-off led to the extinction of many armored fish species 5.
First group of limbed, land-venturing fish becomes extinct VOICEOVER (in English): "Ozone depletion may have triggered a mass die-off of ancient fish and plants by ultraviolet ray exposure 358 million years ago, according to a new study in Science Advances." "Science Magazine reports the research team took a quote 'perfect' six-meter-long mudstone drilled core." "Preserved in the sample were spores from land plants that had flourished in the Devonian period, when Greenland was part of the Old Redstone Continent." "According to the study, the fossilized spores showed a transition from healthy, normal spores to malformed and blackened spores." "The deformities observed strongly suggest the parent plants suffered DNA damage from high levels of ultraviolet-B rays." "The spores dated to the Late Devonian die-off, the second mass extinction in the period that saw the disappearance of many species, including giant armored sharks." "The descendants of the surviving bony fish and sharks would populate today's oceans." "Importantly, the second-wave extinction wiped out the first four-limbed fish that had ventured onto land." "This means another group of five-toed tetrapods became the precursor of land animals." SOURCES: Science Advances, Science Magazine, New Atlas https://advances.sciencemag.org/content/6/22/eaba0768 https://www.sciencemag.org/news/2020/05/no-asteroids-or-volcanoes-needed-ancient-mass-extinction-tied-ozone-loss-warming https://newatlas.com/science/ozone-depletion-mass-extinction-radiation/ *** For story suggestions please contact tips@nextanimation.com.tw For technical and editorial support, please contact: Asia: +61 2 93 73 1841 Europe: +44 20 7542 7599 Americas and Latam: +1 800 738 8377
SOUTHAMPTON, ENGLAND — Ozone depletion may have triggered a mass die-off of ancient fish and plants by ultraviolet ray exposure..