Ecosystem | Definition, Components, and 5 Important Types of Ecosystem


A.G. Tansley in 1935, first coined the term ecosystem. According to him, it is “a particular category of physical systems consisting of organisms and inorganic components in a relatively stable equilibrium, open and various sizes and kinds”.

In other words, the ecosystem may be defined as ‘the interrelationship between the living and the non-living components of the environment. All the abiotic and the biotic components are interrelated with each other through different biogeochemical cycles

Thus, it is the structural as well as the functional unit of the ecology. It is the smallest unit of the biome. The natural environment in which a particular plant or animal species lives in an ecosystem is termed a habitat. So, habitat is an important part of an ecosystem.

What are the Characteristics of Ecosystem?

In every part of the world, different types of ecosystems are identified. All these have their own uniqueness. All of them have a few similarities in functioning, stability, importance, and destruction. The common characteristics are as follows:

  1. These are the representation of the sum of all living organisms and the physical environment.
  2. The basic components are – energy, biome and habitat.
  3. It has a spatial dimension.
  4. These are studied in terms of the temporal dimension.
  5. It expresses complex interrelationships among the components.
  6. It is an open system of matter and energy.
  7. It is relatively stable.
  8. It is powered by energy, predominantly, solar energy.
  9. It is a functional unit.
  10. It is productive
  11. It has a scale dimension as it varies spatially.
  12. It is sequentially developed.

What are the Components of Ecosystem?

Every ecosystem is made up of two types of components – abiotic or non-living components and biotic or living components. Sunlight, air, water, soil etc. all are inorganic or abiotic components. Sunlight or solar energy is the main driving agent of all ecosystems.

Components of Ecosystem

The biotic components include all plants, animals and micro-organisms. These organic components can broadly be divided into –

  1. Autotrophs (green plants which can produce food of their own by the processes of photosynthesis and chemosynthesis)
  2. Heterotrophs (consumers who depend on autotrophs for food)

The Autotrophs are further divided into

  • Phototrophs (producers which prepare food through photosynthesis using solar energy)
  • Chemotrophs (which prepare food through chemosynthesis using atmospheric oxygen)

The heterotrophs are also subdivided into –

  • Saprophytes (depending on dead plants and animals for nutrition)
  • Parasites (depending on living organisms for nutrition)
  • Holozoic (consumers who get food through the mouth)

In general, all the components are classified into four broad categories based on function –

  1. Abiotic elements, including abiotic components and dead biotic compounds.
  2. Producers
  3. Consumers, including herbivores, carnivores and omnivores
  4. Decomposers

So, we can clearly say that no ecosystem can exist without either producers or consumers. It is how it’s formed and it’s the inter-relationship of these two components how it works. It can not survive without any one of it.

Types of Ecosystem

Types of Ecosystem

The biotic and abiotic factors and the prevalent biodiversity make the ecosystem unique and is also influenced by the habitat. On so many bases it can be classified-

A. On the basis of habitat

  1. Terrestrial ecosystem:
    • Forest ecosystem,
    • Grassland ecosystem,
    • Desert ecosystem including hot desert and cold desert
  2. Aquatic ecosystem:
    • Freshwater ecosystem-

      1. River ecosystem
      2. Lacustrine ecosystem
      3. Pond ecosystem
      4. Marsh ecosystem
    • Marine ecosystem-
      1. Estuaries ecosystem
      2. Open ocean ecosystem
      3. Ocean surface ecosystem
      4. Ocean bottom ecosystem

B. On the basis of stages of development.

  1. Early succession ecosystem
  2. Mature ecosystem
  3. Mixed ecosystem
  4. Inert ecosystem

C. On the basis of spatial scale-

  1. Continental ecosystem
  2. Marine ecosystem

D. On the basis of stability-

  1. Simple stable ecosystem
  2. Complex unstable ecosystem

E. On the basis of uses –

  1. Natural ecosystem
  2. Cultivated ecosystem

How does the ecosystem function?

The pattern of the energy flow controls the functionality of the ecosystem. The energy flow follows a unidirectional pattern. The First and the Second Laws of Thermodynamics govern the energy flow pattern.

Solar energy is the basic input in the energy cycle of the ecosystem. Solar energy is stored in the food as chemical energy in the form of carbohydrates through the process of photosynthesis carried out by the green plants, i.e., the autotrophs.

Most of the energy received is lost from the ecosystem following the ‘Lindeman’ 10% Loss‘ principle. Only a small share of energy is used by the green plants, i.e., the producers.

All the heterotrophs depend on the autotrophs for food as they are unable to complete photosynthesis. All the heterotrophs, i.e., the consumers (herbivores, carnivores, omnivores) depend on the chlorophyll-rich plants.

These networks of dependencies create the energy flow of the ecosystem and strengthen its functionality.

The biotic components are interlinked with each other as well. These interlinks are attained through different trophic levels. Energy flows from the Trophic Level I to Trophic Level III. Finally, the biotic components die and are decomposed by the microorganisms i.e., the decomposes.

The organic and the inorganic substances move in reverse in various closed cyclic paths among the biosphere, atmosphere, hydrosphere and lithosphere. In this way, the nutrients pass into different biotic communities through the biogeochemical cycles driven by the energy cycle. Hence, the soluble nutrients are circulated in the ecosystem.

What is Ecosystem Productivity?

The productivity of ecosystem is the rate of growth of energy or organic substance per unit time by the producers at the Trophic Level I through the process of photosynthesis including solar energy.

This productivity depends on two factors – (a) the amount of solar energy available to the producers at Trophic Level I, and (b) the efficiency of the green plants to convert solar energy into chemical energy. It is measured in gram/m2/year or day.

What is Ecosystem Stability?

The balance between the production and consumption of elements in the ecosystem is termed the stability of the ecosystem. A normal ecosystem maintains an equilibrium condition, i.e., a homeostatic mechanism. It is the inbuilt self-regulating mechanism of an ecosystem that helps it to counterbalance any change that occurred in it and restore stability.

How is the Ecosystem destroyed?

When the homeostatic mechanism is affected and fails to adjust and restore stability, it is referred to as ecosystem instability. Numerous anthropogenic factors cause this instability. All these instabilities cause the destruction of the ecosystem. Mostly human interferences are the major reasons behind the destruction.

 For example –

  1. Large scale destruction of vegetation cover
  2. Large scale environmental pollution
  3. Introduction of exotic species in a new habitat
  4. Modification of virgin ecosystems
  5. Modification or alteration of ecosystem components
  6. Introduction of harmful chemicals
  7. Uncontrolled urbanization, industrialization, mechanization etc.
  8. Manipulation of environmental processes

All these human actions disturb stability and threaten its very existence.

⫸ Conclusion:

In conclusion, an ecosystem is a community of different species that interact with one another and their environment to produce the desired effect. The characteristics of an ecosystem are its size, boundaries, diversity, complexity, and stability. The components of an ecosystem include producers, consumers, decomposers, abiotic factors, and biotic factors. There are three types of ecosystems: terrestrial (on land), aquatic (in water), and aerial (in the air). Ecosystems function through the cycling of matter and energy.

By understanding these principles about ecosystems, we can better manage them for human benefit. We hope you’ve enjoyed learning about ecosystems!

As always, we love to hear your thoughts. What did you find most interesting? Do you believe that humans should try to preserve or restore damaged ecosystems? Are there any types of ecosystems we missed that you would like us to cover in a future post? Let us know in the comments below! 

⫸ Frequently Asked Questions on Ecosystem:

Q. What is an ecosystem?

A: An ecosystem refers to a group of living and non-living things that interact with one another to maintain the balance of their environment. The term ecosystem can be used to describe everything from a rainforest to a single pond.

Q. What are the different components of an ecosystem?

A: There are three main types of components in an ecosystem: biotic, abiotic, and detrital. Biotic components are living things, abiotic components are non-living things, and detrital components are dead or decaying organic matter.

Q. What is the importance of ecosystem stability?

A: The stability of an ecosystem is important because it ensures that the balance of the environment is maintained. If one component of an ecosystem is removed or changed, it can upset the balance and have a ripple effect on the rest of the ecosystem.

Q. What causes an ecosystem to become unstable?

A: Several factors can cause an ecosystem to become unstable, including pollution, deforestation, overfishing, and climate change.

Q. What are some ways to help protect and preserve ecosystem stability?

A: There are several ways to help protect and preserve ecosystem stability, including reducing pollution, restoring degraded ecosystems, and promoting sustainable agriculture.

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