| 11. | These complex multitrophic interactions involve more than two trophic levels in a food web.
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| 12. | By reintroducing these salmon, the hatchery strengthens the surrounding ecosystem at various trophic levels.
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| 13. | Shrimp feed on bottom detritus, the very lowest trophic level.
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| 14. | However, predators can also influence the structure of lower trophic levels from the top-down.
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| 15. | This feeding provides a critical link within the global carbon cycle, linking trophic levels.
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| 16. | Fish that occupy the higher trophic levels are less efficient sources of food energy.
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| 17. | The phrase, trophic level, refers to the different levels or steps in the energy pathway.
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| 18. | One way of classifying predators is by trophic level.
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| 19. | Energy from the sun is transferred through the ecosystem by passing through various trophic levels.
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| 20. | Paleoecological studies can reconstruct fossil food-webs and trophic levels.
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