General

Les chaînes alimentaires

Summary
A food chain is an organized sequence of living beings linked by a food relationship. The animal takes the energy necessary for its survival from its food.

. They manufacture their own organic matter from nutrients, CO2 and light (photosynthesis).

The animals located just above in the chain are the first level consumers: the herbivores.

A carnivore that has no predator is called a large predator.

The arrow means “… is eaten by …”. A food chain is made up of links that may be part of other chains. They are branches of a large food web.

This animation omits the role of decomposers. These are organisms and microorganisms that break down dead organic matter (garbage, dead plants and animals). They provide most of the nutrients recycled by producers.

Learning Objectives

To teach the interdependence of all these organisms within an ecosystem.
To mention that many chains exist for the same ecosystem. A food chain is a branch of a food web.
Discuss the notion of food webs and food webs.
Discuss the concept of predator/prey.

To learn more about the food chain
Animals have a variety of foods, therefore, they belong to several chains. All the food chains in an ecosystem constitute a food web. The food web is the set of networks present in a defined space.

Each link in the chain draws its energy from the lower link. The food chain thus reflects the transfer of energy between two consecutive links. Nutrients are exchanged, which can cause an accumulation of toxins in very different proportions depending on the level. Pollution accumulates more in the organisms of the upper links.

They are autotrophic organisms that produce organic matter from inorganic elements such as carbon and nitrogen taken from mineral salts in the soil, using CO2 from the air and sunlight. They do not need any living being to live and feed themselves.

Consumers are the higher order links, they feed on living beings. They are divided into three families: herbivores, carnivores or predators and large carnivores or large predators.

This food cycle is maintained thanks to decomposers that degrade organic matter of all categories, returning it to the environment in the form of mineral salts, essential nutrients for producers.

Only 10% of the energy is transferred from one link in the chain to another. Producers are an almost inexhaustible source of energy for herbivores. Herbivores spend the energy from plants mainly on reproduction of their species. Carnivores spend the energy from their food primarily on foraging and territory defense and much less on reproduction.

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