The Devonian extinction was not one sudden blow, but a long crisis across millions of years. Many marine species disappeared as oceans became oxygen-poor. The exact cause remains debated, but likely stressors include nutrient runoff, algal blooms, climate shifts, and widespread ocean anoxia.
Oceans Lose Their Breath
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Oceans Lose Their Breath
~372–359 Million Years Ago
Cause: Ocean Anoxia
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The Devonian extinction shows that evolution can be reshaped not by one sudden blow, but by a long collapse in ocean health.
Subject: Evolution.
Across millions of years, oxygen-poor seas slowly choked marine life during the Devonian crisis. Reefs fell, many species disappeared, and the balance of life shifted. It is a reminder that when oceans lose their breath, evolution changes course.
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