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Wetlands are critically important to the global food system and are often described as “biological supermarkets.” This term reflects their extraordinary ability to provide a wide variety of food resources while supporting agriculture, fisheries, and essential ecosystem services that sustain water and soil health.

Despite covering only about 6–9% of the Earth’s surface, wetlands support nearly 20% of all living organisms and provide food, water, and livelihoods for over one billion people worldwide. Their contribution to sustainable food systems is both direct and indirect, making them indispensable to global food security.

Why Wetlands Are Called Biological Supermarkets

Wetlands are among the most productive ecosystems on the planet. They naturally generate diverse food sources while maintaining ecological balance, which is why scientists and environmental organizations refer to them as biological supermarkets.

1. Direct Food Production

Wetlands produce large quantities of food that are essential to local and global diets. These include:

• Fish, crustaceans, and mollusks from inland and coastal waters
• Wild rice and aquatic crops
• Medicinal and edible plants harvested from wetland ecosystems

Inland capture fisheries and aquaculture systems depend heavily on healthy wetlands, making them a primary source of protein for millions of people.

2. Rice Cultivation and Food Security

Wetland habitats—especially rice paddies—are central to global food security. Rice is the staple diet for nearly 3 billion people, and its cultivation relies on controlled wetland environments that provide water, fertile soils, and nutrient recycling.

Sustainable management of these wetland-based systems is essential to ensure long-term rice production without degrading natural ecosystems.

3. Fish and Shellfish Nurseries

Coastal wetlands such as mangroves, estuaries, and salt marshes serve as breeding and nursery grounds for most commercial fish and shellfish species. Juvenile fish depend on these protected environments to grow before moving into open waters.

Without wetlands, many global fisheries—and the food systems that rely on them—would collapse.

4. Agricultural Support and Water Management

Wetlands function as natural water reservoirs, storing rainwater and releasing it slowly during dry seasons. This provides reliable water supplies for:

• Livestock
• Irrigation
• Smallholder and commercial agriculture

In addition, wetlands act as natural filters. They remove sediments, excess nutrients, and pollutants from agricultural runoff, helping maintain water quality and prevent downstream pollution.

5. Resilience, Stability, and Climate Protection

Wetlands act like natural sponges, absorbing excess water during floods and releasing it during droughts. This buffering capacity protects farmland from extreme weather events and stabilizes agricultural production.

They also store large amounts of carbon, contributing to climate change mitigation and increasing the resilience of food systems in a warming world.

Threats to Wetlands and the Need for Wise Use

Despite their importance, wetlands are among the most threatened ecosystems on Earth. Over the last century, around 70% of global natural wetlands have been lost, mainly due to agricultural expansion, urban development, and unsustainable human activities.

The concept of “wise use” of wetlands—promoted under the Ramsar Convention—emphasizes sustainable management that balances food production with ecosystem conservation. Protecting wetlands is not about limiting food systems, but about ensuring they remain productive, resilient, and sustainable for future generations.

Conclusion

Wetlands are far more than waterlogged landscapes—they are biological supermarkets that underpin sustainable food systems worldwide. By supporting agriculture, fisheries, water management, and climate resilience, wetlands play a central role in feeding the planet.

Safeguarding these ecosystems through responsible and sustainable practices is essential to maintaining food security, livelihoods, and environmental health in the years to come.