Difference Between Grazing and Detritus Food Chain

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What is the Food Chain?

We live in an environment where there are a number of organisms that live with us, such as plants, animals, insects, reptiles, and different kinds of plants and trees. These organisms are dependent on one another for food and nutrition. The organisms are placed on various levels as per their requirement of nutrition, and each level is known as a trophic level. There is a continuous transfer of energy in the form of food, and this transfer is termed as a food chain. The transfer can take palace from one organism to another or from one level to another. 


A food chain can be defined as the transfer of energy and nutrients in the form of food from one organism to another. A food chain always starts with the producers and ends with the apex predator. 


For Example, Grass   →   Insects   →   lizard   →   Snake.

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A food chain is of two types, Grazing Food Chain and Detritus Food Chain.

There is a lot of difference between the grazing food chain and detritus food chain, and here we will discuss it in detail. 


Grazing Food Chain

As we know, the primary source of energy is the sun. The plants convert the sun’s energy into food by the process of photosynthesis. This is the start of the grazing food chain. A food chain where the energy is gained by the organisms is from photosynthesis; it is termed as the Grazing Food Chain. 


The Grazing food chain starts with the green plants as they are the producers and can perform photosynthesis. Then the energy is transferred from the green plants to the herbivores. In a grazing food chain, the sun is the ultimate or primary source from which energy transfer takes place.  


The Grazing Food Chain can be further subdivided into two types:

  • Predator Food Chain - Here, the autotrophs or producers are directly consumed by the herbivores.

  • Parasitic Food Chain - Here, the Herbivores that eat the producers are infected by parasites.

The Grazing food chain is a type of food chain where the energy transfer is between the lowest trophic levels. Examples of Grazing Food Chain are:


Phytoplankton  → small fish → Large Fish


The Above food chain is an example of an aquatic grazing food chain. Here, we can see that the phytoplanktons which are the aquatic plants are consumed by small fishes which are eaten by large fishes.


Grass → Deer → Lion/Tiger.


Here is another example of a grazing food chain which represents the Terrestrial animal food chain. 


Detritus Food Chain

In a Detritus Food Chain, the main source of nutrition is dead plants or animals. The detritus food chain does not depend on solar energy. The organisms that gain their energy from the dead remains of the plants or animals are known as Detrivores or Decomposers. 


In a detritus food chain, the energy is first transferred from the dead remains of plants and animals to the decomposers and then it is transferred to the predators feeding on the decomposers.


Examples of Detritus Food Chain are:


Dead Organic Matter → Micro-organisms → Decomposers.


Here, The food chain starts with the dead remains of plants and animals, which is consumed by micro-organisms such as bacteria or fungi. These micro-organisms are eaten by decomposers such as snails, earthworms, and the decomposers are finally consumed by other large animals.


Difference Between Grazing and Detritus Food Chain

Grazing Food Chain and Detritus Food Chain have certain differences which we have listed down here.


Here we have provided the distinguish between grazing and detritus food chain are:

 

Basis of Difference

Grazing Food Chain

Detritus Food Chain

Definition

A grazing food chain is a food chain which starts with green plants as the main source of energy.

A detritus food chain is a food chain which starts with the dead remains of organisms as a main source of energy.

Energy Source

The primary source of energy in a grazing food chain is solar energy.

The dead remains of plants and animals act as the primary source of energy for the detritus food chain.

Organisms Involved

The Grazing Food chain involves all the macroscopic or sub-soil organisms.

The Detritus Food chain mainly involves microscopic organisms.

Importance

The grazing food chain releases energy into the ecosystem.

The detritus food chain uses a large amount of energy from the environment.

First Trophic Level

In the Grazing food chain, green plants form the first trophic level.

In the detritus food chain, the first trophic level is occupied by the decomposers. 

FAQ (Frequently Asked Questions)

Q1. What Do You Mean By Autotrophs?

Answer: Autotroph refers to those organisms that can produce food on their own. They produce food by the process of photosynthesis. They use sunlight, water, carbon dioxide and produce food in the presence of chlorophyll. Green plants are mostly considered as autotrophs. They are also called producers and hence form the first trophic level in a food chain. There are certain bacteria and algae that are considered as autotrophs as they can produce their own food. Autotrophs are considered as the most important part of a food chain as, without them, no food chain can be created. They provide food to various other animals.

Q2. Distinguish Between Grazing and Detritus Food Chain.

Answer: A food chain can be of two types, i.e. Grazing food chain and detritus food chain. A grazing food chain is the one where the main source of energy is the producers or green plants whereas, a detritus food chain is the one where the main source of energy is the dead remains of organisms. The grazing food chain releases energy into the environment, but the detritus food chain uses energy from the environment. The grazing food chain is large as compared to the detritus food chain. A Grazing food chain consists of microorganisms, but the detritus food chain consists mostly of microorganisms.