Ecologically, what important role are walruses considered in some Arctic environments due to their feeding activities?

Answer

Keystone species

Ecologically, walruses are considered keystone species in some Arctic environments, primarily due to the impact of their intensive bottom-feeding activities which constantly disturb and redistribute sediment.

Ecologically, what important role are walruses considered in some Arctic environments due to their feeding activities?
dietanimalmammalwalrus