How Microscopic Plankton Power the Entire Ocean Food Web

Tiny But Mighty: Plankton are microscopic organisms that float through the ocean—yet they sustain nearly every form of marine life.
The Ocean’s Green Machines: Phytoplankton use sunlight, water, and carbon dioxide to produce oxygen and energy, fueling the marine food chain.
Breathing Life Into the Planet: These invisible drifters generate more than half of Earth’s oxygen—more than all the world’s forests combined.
The Base of It All: Plankton feed small fish and krill, which feed larger predators like tuna, whales, and seabirds—a pyramid built from the tiniest lives.
Carbon Capturers: When plankton die, their bodies sink to the seafloor, carrying carbon with them—helping regulate the planet’s climate.
A Rainbow in a Drop: Viewed under a microscope, plankton reveal dazzling shapes—spikes, spirals, and glassy shells that look like tiny works of art.
Bloom and Bust: In spring and summer, massive plankton blooms turn vast ocean areas green, triggering feeding frenzies that sustain entire ecosystems.
The Ocean’s First Farmers: Phytoplankton photosynthesize like plants, while zooplankton graze on them—together forming the foundation of all ocean productivity.
Global Drifters: Carried by currents and tides, plankton connect distant ecosystems—spreading nutrients and life across the seas.
Fragile Foundations: Pollution, warming waters, and acidification threaten plankton populations—putting the ocean’s entire food web at risk.