Celebrating the Ocean’s Silent Guardians
Seagrasses are flowering plants that grow in shallow coastal waters. They have roots, stems, and leaves, forming vast underwater meadows that sway gently with the tides. Provide food and shelter for thousands of marine species. Seagrasses are often called the “forgotten ecosystem” because they receive less attention than coral reefs or mangroves. “World Seagrass Day” is observed every year on 1 March. Seagrasses are highly efficient carbon sinks, storing ~18% of the world’s oceanic carbon (~35 times faster than tropical rainforests) and contributing to climate change mitigation. Seagrass root systems stabilise sediments, reduce erosion, buffer ocean acidification, and protect coral reefs. Seagrasses are much younger than corals and fish but older than marine mammals. They are the only flowering plants fully adapted to marine life. This makes them critical “bridge species” that link terrestrial plant evolution to marine ecosystems. Seagrass decline is driven by both human activity and climate change. Seagrass does not roar like storms or shine like coral reefs. It works quietly — protecting coastlines, nurturing marine life, and storing carbon.
Seagrass Ecosystems are Critical for Biodiversity, Climate Mitigation, and Food Security, Â
Must Be Protected and Restored.
UN General Assembly Resolution
Seagrasses are flowering plants that grow in shallow coastal waters. They form underwater meadows that provide food and shelter for thousands of marine species. Most people do not realise seagrasses exist, let alone their importance. Seagrasses are often called the “forgotten ecosystem” because they receive less attention than coral reefs or mangroves. “World Seagrass Day” is observed every year on 1 March. It was Sri Lanka’s initiative that led the UN to pass the resolution on observation, which began in 2023. The observation aims to raise awareness, encourage conservation efforts, and highlight the need to integrate seagrass protection into climate and biodiversity strategies.
Unlike seaweed, seagrass has roots, stems, and leaves, forming vast underwater meadows that sway gently with the tides. Seagrass meadows hidden beneath the waves may not be as famous as coral reefs or mangroves, but they are vital for the health of our planet. Seagrasses are highly efficient carbon sinks, storing ~18% of the world’s oceanic carbon (~35 times faster than tropical rainforests) and contributing to climate change mitigation. Seagrasses occur in 159 countries across six continents, covering ~300,000 km², making them among the most widespread coastal habitats. Australia is home to some of the largest continuous seagrass meadows.
Though they cover ~0.2% of the ocean floor, their ecological impact is immense. Seagrass meadows provide food and shelter for thousands of marine species, including turtles, seahorses, and fish. Seagrass root systems stabilise sediments, reduce erosion, buffer ocean acidification, and protect coral reefs. They filter and store nutrients and pollutants, reducing contamination in seafood.
Despite their importance, seagrass meadows are disappearing at alarming rates (~7% per year) due to coastal development, pollution and nutrient runoff, climate change, rising sea levels and destructive fishing practices. Researchers warn that losing seagrasses means losing a vital ally in the fight against climate change and ocean degradation.
Seagrasses are much younger than corals and fish but older than marine mammals. They are the only flowering plants fully adapted to marine life. This makes them critical “bridge species” that link terrestrial plant evolution to marine ecosystems. Found in coastal zones, lagoons, and estuaries where sunlight can reach the seabed. Though they look like terrestrial grasses, they are not related to land grasses.
Seagrasses face competition from other marine organisms (such as algae) and environmental pressures. Seagrass decline is driven by both human activity and climate change. Human activity is the more immediate and direct driver of seagrass loss. Climate change is a slower but intensifying stressor, making recovery harder and compounding human impacts. To detect decline early, monitoring is done by regularly tracking seagrass health and distribution using satellite imagery and underwater surveys. Â
Seagrass Does Not Roar Like Storms
or Shine Like Coral Reefs.
It Works Quietly
Protecting Coastlines, Nurturing Marine Life,
and Storing Carbon.
World Seagrass Day is about giving visibility to a hidden ecosystem that quietly sustains life, combats climate change, and supports human well-being.
Toon: Shreya
log: M Sai Baba
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