Science, Space and Technology News 2024
Oxygen is crucial for life on Earth, but the ocean’s ability to absorb it is diminishing due to global warming, affecting marine ecosystems and human activities. Research involving chemical and morphological analyses of microscopic fossils found in marine sediments has shown that during past climate change events, like the PETM, the tropical ocean’s oxygen levels increased, which may have mitigated mass extinctions in upper ocean layers, contrary to expectations of widespread oxygen depletion.
Oxygen is essential for maintaining life on Earth. The ocean receives its oxygen from the top layers that are in contact with the atmosphere. However, as the Earth warms, the ocean’s ability to hold oxygen is slowly diminishing, leading to significant impacts on marine ecosystems and the human activities reliant on them. Although it is expected that these trends will persist, the future distribution of oxygen within the ocean’s interior remains uncertain.
In addition, the size of foraminifera fossils proved to be a fundamental piece of the puzzle. Models that describe the metabolism of marine organisms allow to link their body size to the environmental temperature and oxygen content of the water they live in. A reduction in body size is an effective adaptation to a warming climate, as it allows organisms to reduce their metabolism in times of stress.
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