1. Each stage/level of the pyramid is called a " trophic level," or the highest position an organism typically occupies in a food chain. Each trophic level is shared by organisms that occupy the same position in a food chain. 2. As you go up the trophic pyramid, the total number of organisms (or biomass) at the next level decreases because much of the original energy captured from the sun during photosynthesis is lost at each level of the trophic pyramid (see explanation below). Consumers at the highest trophic level are called apex predators . 3. The trophic pyramid shows that some, but not all, the original food energy made by photosynthesizers is transferred from one trophic level to the next.
A food web consists of all the food chains in a single ecosystem . Each living thing in an ecosystem is part of multiple food chains. Each food chain is one possible path that energy and nutrients may take as they move through the ecosystem. All of the interconnected and overlapping food chains in an ecosystem make up a food web Trophic Levels Organisms in food webs are grouped into categories called trophic levels. Roughly speaking, these levels are divided into producers (first trophic level ), consumers, and decomposers (last trophic level). Producers Producers make up the first trophic level. Producers, also known as autotrophs, make their own food and do not depend on any other organism for nutrition. Most autotrophs use a process called photosynthesis to create food (a nutrient called glucose ) from sunlight , carbon diox...
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