Imagine a very simple food chain in which orcas (killer whales) eat only sea otters, sea otters eat only sea urchins, and urchins eat only kelp (marine
algae). Orcas, sea otters, and urchins are the only significant consumers in
the system. To keep one ton of orca biomass fed, you would need about
ton(s) of kelp.*
1
10
100
1,000
1,000,000