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Are Algae Decomposers? (Know The Facts!)




Algae are plant-like organisms that grow in water. They are classified as producers since they create their own food using sunlight, sugar, carbon dioxide and minerals.

Algae are not decomposers but producers. This is because algae live predominantly off sunlight using photosynthesis to extract energy and they breathe CO2 to obtain carbon atoms to build sugars that they use to grow.

There are over 3000 different species of algae identified, ranging in size from microscopic single-celled organisms to giant kelp and other seaweeds that can reach up to 200 feet in length!

Algae are an important food source for many aquatic animals like fish, crustaceans and molluscs.

And we humans use them to make products like toothpaste, shampoo and biofuels.

Can Algae be Considered Decomposers?

No. Algae do not consume dead or decaying matter directly, and are therefore not considered decomposers. However, some algae, like seaweed, may get their minerals from dead plants and animals indirectly.

Some algae even produce chemicals that kill other algae or animals so that they decompose around them to release nutrients! However, the decomposition is taken care of by bacteria and not the algae themselves.

However, no algae are decomposers because decomposers are mainly bacteria and fungi that break down dead organic matter.

Are Algae Producers or Consumers then?

Algae are producers because they make their own food. Although algae and plants can absorb sugars and use for energy instead of the sun, they are still considered producers because this is their primary role in the ecosystem.

Some animals like cows are primary consumers because they get their food from plants.

Some animals like wolves are tertiary consumers because they eat other animals as food.

However, no animals are considered producers. Only plans, algae (including Euglena) and cyanobacteria are.

Where do Algae Live?

Algae are aquatic plants that live in saltwater and freshwater. They are found all around the world, from the tropics to Polar Regions.

Algae are aquatic plants that live in saltwater and freshwater. They are found in lakes, rivers, puddles, and even growing on windows and trees!

Primary Diet of the Algae

Algae are producers that make their own food from sunlight, carbon dioxide, minerals, and dissolved nutrients.

Algae use sunlight to make energy. They use carbon dioxide from the air and dissolved minerals from the water. They use carbon dioxide from the air and dissolved minerals from the water.

That is, algae need:


Carbon dioxide

Minerals (Cobber, Zink, Iron, Nitrogen, Prosperous etc.)


This is the same components that plants need in their “diet” and is enough for them to grow and reproduce!

Feeding Habits of Algae

Algae produce their own food and do not need to eat. However, algae do absorb nutrients in the form of minerals from the water around them. Algae need sunlight, carbon dioxide, and dissolved minerals to survive.

Are Algae Herbivores, Carnivores or Omnivores?

Algae are producers and not consumers so they do not really classify according to that scheme. If anything they are “lightivores”.

Algae are producers because they make their food from simple inorganic molecules like carbon dioxide.

What Type of Producers are Algae?

Algae are (primary) producers because they make their own food. Producers get their energy from inorganic molecules like carbon dioxide catalyzed by sunlight.

Are Algae an Autotrophs or a Heterotrophs?

Algae are autotrophs because they make their own food. Autotrophs get their energy from inorganic molecules like carbon dioxide and sunlight. Some bacteria are also autotrophic but get their energy from the chemical bonds in inorganic molecules instead of light!

Where are Algae in the Food Chain?

Algae are producers because they make their own food. Many animals, like cows, krill and even fungi, are producers because they make their own food from simple inorganic molecules like carbon

Algae are producers so they are just above decomposers in the food chain. They play an important role because they supply the energy for all the animals in the levels above them in the food chain.

Algae are on the second shelf of the food pyramid where plants are also located. Decomposers are at the very bottom.

Many plants like trees, bushes, flowers are also important producers on land whereas algae are the most important producers in water e.g. oceans and ponds.

What Animals Prey on Algae?

Many animals prey on algae, including humans. Some animals that eat algae are fish, crabs, shrimp, and snails.

These animals help to keep the algae population under control. Without these animals, the algae would take over the oceans and lakes, which would eventually lead to mass extinctions!

Algae are an important food source for these animals. They provide them with nutrients and energy. The algae also help to oxygenate the water which is important for all aquatic life.

Humans also harvest algae for food, feed livestock with algae, and even use algae to produce biofuels for cars!


In this post I have looked into the lifestyle, habitat and diet of algae, and how their growth is very important for food for a wide variety of creatures, and how their growth affects the environment.

Algae are one of the three most important primary producers in the world, and unlike cyanobacteria, algae are important all year round, and not just at the end of the summer!

Algae have very large cellular bodies compared to cyanobacteria, because algae are plants and not bacteria. Algae are very common in many different environments and can even produce toxins that can be harmful to animals and humans if they come into contact with them.

Algae are very important as a producer of food as well as making a vital contribution to the food chain. Algae also help in the removal of harmful chemicals from our water environments and remove nutrients like phosphate.

Without algae, the oceans and lakes would be a very different place. They play a vital role in keeping the ecosystem healthy and balanced.

If you would like to know more about the different ways that algae are being used to clean up our water, how their growth is important for food production and how they produce toxins, check out this video:

Algae are useful!

You might also be interested in my recent post on another interesting organism that uses photosynthesis but can actually be considered an animal!

Or actual animals that can do photosynthesis

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