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