Interdependence of marine organisms

Marine ecosystem constitutes vast varieties of species. For the convenience of better understanding, these are classified in the three groups according to the location in the sea water.These groups are – Plankton, Neckton, and Benthos. In this blog, I am going to explore the interdependence of marine organisms in the oceanic ecosystem.

Classification of marine organisms

•Plankton — floating organisms

Planktons are also called floating organisms, including plants and animals. It has two major groups – Phytoplanktons and Zooplanktons.  Phytoplanktons are autotrophic plants with photosynthetic pigment; whereas, Zooplanktons thrive on microscopic phytoplanktons.

Phytoplanktons act as a food bank for the marine herbivorous and others. Besides, they are credited for  half of the oceanic oxygen through photosynthesis by using carbon dioxide and sunlight in the photic zone.

On the other hand, zooplanktons are animals which thrive on the Phytoplankton. Plankton includes species of algae, protozoas, and other floating animals.

•Nekton — the swimming organisms

Nektons are labeled as swimmers. These are secondary consumers which thrive on primary consumers zooplanktons. Almost all have backbone. Fishes, reptiles, and dolphins are Nektons. Nektons are the great source of food for human communities.

•Benthos — the crawling organisms

Unlike other two, benthos live at or near the bottom of the Marine environment. Crabs, oysters, and octopus are popular benthos which thrive at the bottom of the aquatic environment. These are also known for theirs recycling abilities of dead materials.

In the Marine ecosystem, these are the three categories of organisms which thrive in the different regions as per theirs abilities. Undoubtedly, this is the beauty of interdependence of marine organisms in the oceanic atmosphere.

This is the chain of interdependence of marine organisms…

• Phytoplankton > Zooplanktons > Nekton > Benthos > bacterioplankton…

This is the general order of marine ecosystem in which all the Marine communities are inter-related or interdependent.

How do they interact with one another ?

Unquestionably, Sun is the primary energy sources for entire environment. In oceanic environment, Phytoplankton as a autotroph, with the help of sunlight and carbon dioxide produces food and precious oxygen for the aerobic organisms.

In this sequence, zooplanktons are primary consumers which graze on the phytoplankton for theirs survival. The second group is Nekton which consume zooplanktons or even other Nektons. These are secondary consumers and constitutes large proportion of human food as well. Some of the Nektons are labeled as scavenger too.

Third group is benthos which thrive at the bottom of aquatic environment. Majority of them are decomposers and play important role in the recycling of materials.


By understanding the complex relationship of interdependence of marine organisms, we could conclude that nature has an infinite repository of resources for the welfare of its stakeholders. But, when the greed overpowers the natural needs, everything becomes fragile and vulnerable.

Growing cyclones in the Arabian sea

Impacts of sea water temperature

What is object complement

Adversative coordinating conjunctions

Outline of modal verbs

Use of adverbs

Relative pronouns

Relative adverbs