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trophic level

The position that an organism occupies in a food chain. For example, green plants (which obtain their energy directly from sunlight) are the primary producers; herbivores are primary ...

trophic level

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A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... level A level in a food chain that is defined by the method of obtaining food and defines the number of steps (energy transfers) up from the original source of energy, from primary producer , to primary consumer , secondary consumer , and tertiary consumer . Trophic ...

trophic level

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A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
59 words

...trophic level The position that an organism occupies in a food chain . For example, green plants (which obtain their energy directly from sunlight) are the primary producers ; herbivores are primary consumers (and secondary producers). A carnivore that eats only herbivores is a secondary consumer and a tertiary producer. Many animals feed at several different trophic levels...

trophic level

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A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... level An individual layer on the pyramid of numbers which represents types of organisms living at parallel levels on food chains . All herbivores live at one level, all primary carnivores on the next level, all secondary carnivores on the next level, and so on. The animals on each level are remarkably distinct in size from those on other levels; there is a clear jump in size between an insect and a bird, for example. The trophic biology of a taxon (species/family/class) fundamentally constrains its ability to convert productivity into individuals....

trophic level

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A Dictionary of Zoology (4 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
65 words

... level A step in the transfer of food or energy within a chain. There may be several trophic levels within a system, e.g. producers (autotrophs), primary consumers (herbivores), and secondary consumers (carnivores); further carnivores may form fourth and fifth levels. There are rarely more than five levels since usually by this stage the amount of food or energy is greatly reduced. See also ecosystem . ...

trophic level

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A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

... level A step in the transfer of food or energy within a chain. There may be several trophic levels within a system, for example, producers (autotrophs), primary consumers ( herbivores ), and secondary consumers ( carnivores ); further carnivores may form fourth and fifth levels. There are rarely more than five levels since usually by this stage the amount of food or energy is greatly reduced. See also ecosystem...

trophic level

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A Dictionary of Plant Sciences (4 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
68 words

... level A step in the transfer of food or energy within a chain. There may be several trophic levels within a system, for example producers (autotrophs), primary consumers (herbivores), and secondary consumers (carnivores); further carnivores may form fourth and fifth levels. There are rarely more than 5 levels since usually by this stage the amount of food or energy is greatly reduced. See also ecosystem...

trophic level

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Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
59 words
trophic level

trophic level noun   Quick reference

New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
57 words
trophic level

trophic level  

The position that an organism occupies in a food chain. For example, green plants (which obtain their energy directly from sunlight) are the primary producers; herbivores are primary consumers (and ...
trophic cascade

trophic cascade  

The movement through three or more trophic levels of a food-web of nutrients released by organisms high in the web (i.e. secondary or tertiary consumers).
trophic structure

trophic structure  

The organization of feeding relationships in an ecosystem into the different levels in a food chain, such as producers (plants), primary consumers (herbivores), and secondary consumers (carnivores).
Lindeman's efficiency

Lindeman's efficiency  

The ratio of energy assimilated at one trophic level to that assimilated at the preceding trophic level; the ratio of energy intake at successive trophic levels. It is one of the earliest and most ...
ecosystem structure

ecosystem structure  

The biotic and abiotic elements of an ecosystem, and the relationships between them, particularly in terms of trophic levels.
top carnivore

top carnivore  

The creature occupying the highest trophic level in a food web (such as a lion). It is generally not consumed by other organisms whilst it is alive.
ecological efficiency

ecological efficiency  

The ratio between the energy assimilated at one trophic level and that assimilated at the immediately preceding level, usually expressed as a percentage; i.e. (A2/A1)×100, where A1 is the lower ...
primary producer

primary producer  

An autotroph that captures energy from the environment and turns it into biomass through photosynthesis or chemosynthesis, and forms the base (lowest trophic level) of a food chain. Examples include ...
energy flow

energy flow  

(in ecology)The flow of energy that occurs along a food chain. Energy enters the food chain at the level of the producers (usually plants) in the form of solar energy. The plants convert solar energy ...
energy budget

energy budget  

A comparison between the amount of energy that enters the body of an animal, or a particular trophic level, and the amount of energy that leaves that animal or level.
tertiary consumer

tertiary consumer  

A carnivore that preys upon other carnivores; a member of the topmost trophic level of a food web.
secondary consumer

secondary consumer  

A carnivore, which sits above (at a higher trophic level than) the primary consumers in a food chain because it eats them. Examples include: on land, lions that eat wildebeest, hawks that eat field ...

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