Oceanic Food Chain

The video explores the oceanic food chain, starting with phytoplankton as primary producers. It describes how Pacific herring feed on plankton blooms, attracting predators like dolphins, sea birds, and humpback whales. Sea lions, another predator, become prey for orcas. The feeding frenzy continues until winter, when plankton diminish, affecting the entire food chain.

What is the primary role of phytoplankton in the oceanic ecosystem?

• They decompose organic matter.

• They form the base of the food chain.

• They are scavengers.

• They are top predators.

Which animal's birth is synchronized with the plankton bloom?

• Pacific herring

• Orcas

• Dolphins

• Sea lions

How do dolphins and sea birds capture herring?

• By using nets

• By trapping them against the surface

• By luring them with bait

• By diving deep into the ocean

What is the primary reason humpback whales travel long distances to Alaskan waters?

• To breed

• To escape predators

• To find warmer waters

• To feed on herring shoals

What strategy do orcas use to hunt sea lions?

• They wait for sea lions to come ashore.

• They hunt in packs.

• They rely on speed and agility.

• They use camouflage.