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  • T. Horowitz

Why is Plankton important?

Plankton is a term used to describe a diverse group of microscopic organisms that float, drift, or swim in water. Plankton is very important as they provide a primary food source for larger organisms and plankton is at the base of the marine food chain.

Without plankton, oceanic life will not eat, and they play a crucial role in balancing the ecosystem and regulating carbon dioxide levels in the atmosphere. Plankton divide into two groups: phytoplankton and zooplankton, they are the smallest forms of plant and animal life in the food chain:

Phytoplankton is a group of organisms that uses photosynthesis to produce their food. They are responsible for producing more than half of the oxygen in the Earth's atmosphere. Some examples of phytoplankton include diatoms, dinoflagellates, and coccolithophores.

Diatoms are a type of phytoplankton that are characterized by their glass-like shells, which are made of silica. They are found all over the world, but they are especially abundant in coastal areas. Dinoflagellates are another type of phytoplankton that have two flagella, which they use to swim through the water. They are also responsible for a phenomenon known as red tide, in which high numbers of dinoflagellates cause the water to turn red and become toxic to other marine life.

Coccolithophores are a type of phytoplankton that have intricate, lacy shells made of calcium carbonate. These organisms are responsible for producing chalk deposits that can be found on the ocean floor. They also play an important role in regulating CO2 levels in the atmosphere, as they absorb and store the gas in their shells. Zooplankton, on the other hand, is a group of organisms that feed on phytoplankton and other small organisms. They are important as a food source for larger marine animals, such as fish and whales. Some common examples of zooplankton include copepods, krill, and jellyfish.

· Copepods are tiny crustaceans that are found all over the world. They are important as a food source for many marine animals, including fish, marine mammals, and birds.

· Krill are similar to copepods but are larger and can grow up to 6 centimeters in length. They are a vital food source for whales and other large marine animals.

· Jellyfish are a type of zooplankton that are known for their stinging tentacles.


They are found in all the world's oceans and are characterized by their dome-shaped bodies and trailing tentacles. Although they are a nuisance to swimmers, they play an important role in the ecosystem as they are a food source for many marine animals. Threats to plankton One of the greatest threats to plankton is climate change. Rising sea temperatures and ocean acidification caused by high CO2 levels are affecting the growth and reproductive capacity of plankton species. This has a trickle-down effect on the entire marine food web, as many animals that rely on plankton as a food source are also affected. Protecting plankton is crucial for the survival of marine life and the health of our planet.


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