A food chain is an interconnection of links in a food web that starts with the producer organism and ends with the predator.Producer organisms include grass or trees and they produce their food by using sunlight or radiation as a source of energy. This also shows how organisms are related by the food they eat.The food chain was invented by an Arabic scientist, Al-Jahiz, in the 10th century and was later published by Charles Elton. Elton also introduced the concept of a food web. The food web is the graphical representation of the food chain and it shows an ecological community between organisms, or what eats what in a community. All organisms are differentiated into tropical levels and are mainly divided into two categories; autotrophs and heterotrophs.Autotrophs: Organisms that produce or prepare food by using carbon dioxide, water, and sunlight as energy sources. Because they produce their food, they are also called producers, and the process of preparing their own food is known as photosynthesis.Heterotrophs: Organisms that depend on other organisms for their food are called heterotrophs. They are dependent either on plants or animals. Depending on which, these organisms are divided into three main types: herbivores, which eat only plants for their food; omnivores, which eat both plants and animals; carnivores, which eat only animals. Besides producers, all other animals in a food chain are called consumers. Food Chain ProcessA food chain is basically an eventual order in an ecosystem. It is a sort of wheel of life in which one organism consumes the other which transfers nutrients and energy.The food chain process starts from tiny plants and ends with consumers or the higher-level organisms. This chain describes the flow of energy and nutrients at each level. Energy is transmitted in the form of food. The hierarchy of levels is producers, primary consumers, secondary consumers, and tertiary consumers.The ocean ecosystem is one such type of food chain and can also be called a marine or aquatic ecosystem. The food chain in this ecosystem starts with algae or phytoplankton, which are the base of the aquatic food web. They are the producers. These producers are eaten by primary consumers called zooplankton, including crustaceans and small fish. The primary consumers are then eaten by secondary consumers like small sharks, baleen whales, corals, and fish. Secondary consumers are eaten by predators. Animals Involved The three trophic levels of organisms in a food chain show an occupied position. The first-level organisms are placed at the bottom of the pyramid, second-level organisms are placed in the middle, and all other organisms occupy the top. These levels change depending on the ecosystem’s species, but a basic one has three levels. Producers will always be the first-level organisms irrespective of the ecosystem.Primary producers, including bacteria, algae, and phytoplankton, prepare their own food by using the sun’s energy as a source. They can also prepare their food without using light energy using a process called chemosynthesis and uses chemicals. The primary consumers, including zooplankton, rotifers, copepods, and larval stages of some fish graze on phytoplankton. The other zooplankton eats or feeds on algae. Predators actively feed upon other animals. Predators are differentiated into pursuit predators, ambush predators, and top predators.Box jellyfish, sea stars, sharks, and fish like tuna, herring, and cod, which come under the category of pursuit predators, search for their prey. Ambush predators like scorpionfish, mantis shrimp, and some eels capture and attack their prey by hiding. Killer whales and large sharks are top predators which do not have natural predators of their own.Here is an example of an ocean 0r marine food chain: Microalgae photosynthesize food from sunlight. Microzooplankton eats the microalgae. Copepods (a group of small crustaceans) then eat microzooplankton. Small larval fish eat the copepods. Comb jellies and chaetognaths eat the larval fish. Juvenile fish and larval carbs eat the chaetognaths. Small fish are eaten by large fish. Sea birds and dolphins eat large fish. Whale sharks and Baleen whales although quite large, eat zooplanktons.Why is it important?Most organisms in the ocean food chain intertwine in the food web as many of them depend or feed on more than one plant or animal. Oceans provide shelter to many different organisms, many of which are not yet known.An ecosystem is formed by a collection of animals and plants in a particular area where the landscape and climate directly affect their habitat and interactions. The three main types of ecosystems are freshwater, terrestrial, and ocean. Each of these ecosystems has a wide and huge variety of habitats and species, which accounts for the diversity of organisms on the planet.Food chains or the food web play an important role in every ecosystem. Disturbance in any chain level can result in the extinction of species and accumulation, affecting all species and organisms and creating a crisis. This directly shows the interdependency of organisms on each other within the ecosystem. The cycle or chain must be continued and maintained accordingly to avoid this.Food chains can be represented diagrammatically in a pyramid by illustrating the energy flowing into each level or zone. It can be called an energy pyramid. The energy transfer can also be illustrated as mass and called a biomass pyramid. There can be ups and downs in biomass when compared between organisms. For example, the biomass of phytoplankton is less when compared to zooplankton, while both are part of it.Amazing Facts About Food Chains In The OceansThere are more than 300,000 species in the ocean ecosystem. Altogether, they cover a total of 15% of the population on the earth.A food chain or food web ties together all marine species. The ocean food chain is full of various plants and animals, which are interconnected.The ocean or marine ecosystem has four levels; photoautotrophs, herbivores, carnivores, and top predators.Photoautotrophs: The bottom level of the ocean is covered by a tiny, one-celled organism called phytoplankton. Along with this, seaweed also serves as a producer in this ecosystem. By using sunlight, they convert it into chemical energy to survive. They also produce oxygen in the ocean and are microscopic. Examples of photoautotrophs include dinoflagellates and cyanobacteria.Herbivores: The next level is filled with herbivores. They eat plants and are known as plant-eaters. These are huge and can be seen easily. Sea urchins play an important role at this level as they maintain the balance between algae and corals. Examples of herbivores include manatees and dugongs.Carnivores: Carnivores make up the third level. It consists of a very large group of small carnivores, including fish like sardines and menhaden. One simple fact about this level is that the larger fish eat the smaller fish.Top predators: Large predators occupy the topmost level in this ecosystem. Their features differ within various kinds. There are finned animals like dolphins and tuna, and feathered animals like penguins, pelicans, seals, and walruses. These are all good hunters and are eaten only by humans.
A food chain is an interconnection of links in a food web that starts with the producer organism and ends with the predator.
