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The role of the microbial food web. Resources. Energy transfer describes the changes in energy (a state function) that occur between organisms within an ecosystem. Living organisms are constantly changing as they grow, move, reproduce, and repair tissues. These changes are fueled by energy.
Energy is passed between organisms through the food chain. Food chains start with producers. They are eaten by primary consumers which are in turn eaten by secondary consumers. This energy can then be passed from one organism to another in the food chain.
Energy transfer between trophic levels is not very efficient. Only about 10% of the net productivity of one level ends up as net productivity at the next level. Ecological pyramids are visual representations of energy flow, biomass accumulation, and number of individuals at different trophic levels.
Energy transfer in ecosystems All organisms require an energy supply for cellular activities such as protein synthesis and cell division, which enables organisms to grow. Some of this energy is stored in the new material (for example, cellulose and muscle protein) made by growing organisms. This is called biomass.
Primary producers use energy from the sun to produce their own food in the form of glucose, and then primary producers are eaten by primary consumers who are in turn eaten by secondary consumers, and so on, so that energy flows from one trophic level, or level of the food chain, to the next.
Organisms release energy from their food by the process of respiration. In most ecosystems on the planet the ultimate source of energy is the sun.
These can be predators, scavengers and parasites. When a plant is eaten by a primary consumer, only 10% of the energy is passed on. The low percentage of transferred energy can be attributed to different reasons like some of the organism not being eaten, incomplete digestion of the eaten organism,…