Question

: In the Bering Sea, zooplankton eat phytoplankton, small fish eat zooplankton, large fish eat small fish, Steller sea lions eat large fish, transient orcas eat Steller sea lions. Identify the trophic level of each in the table below (copy-paste OK). An adult female orca weighs about 2,500 kg (males are larger). Given Elton’s “rule of 10s,” what biomass is required at each level to support a single female transient killer whale in Alaska (type biomass answers in kg)?

Trophic Level	Producer	10 consumer	20 consumer	30 consumer	40 consumer	50 consumer
Organism	phytoplankton	zooplankton	Small fish	Large fish	Sea lions	orcas
Biomass

Answer 1

The elton's rule of 10 suggests that only 10 % of energy will be passed on from one trophic level to another in energy pyramid or food chain.

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