What Are the 4 Levels of the Food Chain?
All living things rely on each other because they are part of the food chain. They are the basic building blocks of every ecosystem.
At the bottom of the food chain, plants are natural producers and provide food and nutrients to consumers.
Herbivores nourish on plants and insects. Then, predators prey on herbivores or other predators.
When an animal dies, scavengers and decomposers break them down. Afterwards, it can be recycled to be part of the food chain again.
The food chain is like a domino effect as each organism affects one another. So let’s go through all the links if the food web one step at a time starting with plants.
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1. Primary producers
On land, producers like green plants are at the base of the food chain. In the ocean, it’s phytoplankton that generates 95% of primary production. They also contribute 50% of oxygen to our atmosphere.
Photosynthesis allows plants to create the essential sugars and nutrients for survival. They incorporate solar energy and inorganic nutrients to generate new living tissues.
Plants are autotrophs that use energy from the sun to make their own food. They are natural producers and provide food and nutrients to consumers like herbivores and omnivores.
2. Herbivores (consumers)
Herbivores nourish on plants that take energy from the sun. For example, rabbits, cows, sheep, giraffes, elephants, caterpillars and grasshoppers are types of herbivores.
These primary consumers (generalists) transform plant tissue into animal tissue. Herbivores are heterotrophs which cannot produce their own food. Instead, they rely on sources of organic carbon like plants and animal matter.
Herbivores don’t have digestive systems suited for meat. For example, cows and goats have incredibly complex digestive systems. They can get all the essential nutrients from grass because they have several stomachs for digestion.
Because it’s an animal, it is of course a food source for other animals, which are in turn a food source for even more animals.
At the top of the food chain, predators prey on herbivores or other predators. While carnivores only eat meat, omnivores eat both meat and plants.
Foxes, wolves, lions and sharks are types of carnivores. And humans, bears, pigs and pandas are examples of omnivores.
Carnivores have sharp teeth and are efficient at tearing apart flesh. They also have a really short digestive system that’s well-suited for getting nutrients out of meat.
Most ecosystems support higher-level consumers through which materials are transferred from one carnivore to another.
Decomposers (microorganisms and large fungi) are the clean-up crew which return materials to the physical environment. When an animal dies, scavengers and decomposers break them down. Insects like beetles and flies fragment the carcasses into separate pieces.
Next, smaller decomposers like fungi, bacteria and other microbes transform complex compounds into simple chemicals. They are microscopic in size, but they’re large in numbers.
In turn, plant roots can recycle these simple chemicals as a usable form and maintain the circle of life. Overall, decomposers are the clean up crew that recycle matter back to the food chain again.
Where do you fit in the food chain?
We all depend on the environment. Everything is connected. The food chain depicts how did exchanged at different levels.
Even though there are different types of ecosystems, they all generally have:
- Primary producers
The missing link is how the non-living environment interacts with our environment. For example, the sun provides solar energy. And the atmosphere contains inorganic nutrients for plants to grow.
Do you want to learn more about our natural environment? We’ve hand-picked some articles before to help you on your journey to environmental mastery: