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Definition of Trophic level

Trophic level Definition from Science & Technology Dictionaries & Glossaries
Description: Position in the food chain, determined by the number of energy-transfer steps to that level.
Source: Specialized encyclopedia and dictionaries Umbrella species Description: Species whose occupancy area (plants) or home range (animals) are large enough and whose habitat requirements are wide enough that, if they are given a sufficently large area for their protection, will bring other species under that protection.
Source: Global Biodiversity Assessment GBA
© European Communities, 1995-2004
Glossary of Marine Biology
In a food chain, a level containing organisms of identical feeding habits with respect to the chain (e.g., herbivores)
Trophic level Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
The trophic level of an organism is the position it occupies in a food chain. The word trophic derives from the Greek  (trophe) referring to food or feeding. A food chain represents a succession of organisms that eat another organism and are, in turn, eaten themselves. The number of steps an organism is from the start of the chain is a measure of its trophic level. Food chains start at trophic level 1 with primary producers such as plants, move to herbivores at level 2, predators at level 3 and typically finish with carnivores or apex predators at level 4 or 5. The path along the chain can form either a one-way flow or a food "web". Ecological communities with higher biodiversity form more complex trophic paths.

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