| 1. | The definition of the trophic level, TL, for any consumer species is:
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| 2. | In ocean environments, the first two trophic levels are occupied mainly by plankton.
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| 3. | Large predator fish with higher trophic levels have been depleted in wild fisheries.
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| 4. | Example : Assume 500 units of energy are produced by trophic level 1.
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| 5. | However, the intermediate trophic level is only represented by one or two species.
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| 6. | Usually relative species abundances are described for a single trophic level.
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| 7. | They are, in turn, central prey items for higher trophic levels.
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| 8. | Predators and parasitoids were also found, showing an additional trophic level.
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| 9. | In other words, the producers, consumers, and decomposers are the main trophic levels.
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| 10. | Usually, producers have a higher biomass than any other trophic level.
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