Sea Otters and Ecosystem Dynamics

The video explores the critical role of kelp forests in carbon sequestration and biodiversity. It highlights the devastating impact of their decline, primarily due to the loss of sea otters, a keystone species. Conservation efforts have helped restore sea otter populations, leading to the recovery of kelp forests through trophic cascades. This restoration enhances carbon storage, significantly impacting climate change mitigation.

What percentage of human-generated atmospheric carbon dioxide is absorbed by oceans in kelp forests?

• Three-quarters

• Nearly a quarter

• All of it

• Half

Why are sea otters considered a keystone species?

• They are the most intelligent marine animals.

• They are the fastest swimmers in the ocean.

• They play a critical role in maintaining ecosystem stability.

• They are the largest marine mammals.

What was the main reason for the decline in sea otter populations between 1741 and 1911?

• Pollution

• Natural disasters

• Hunting for their fur

• Climate change

What happens to kelp forests when sea otters are absent?

• They become underwater deserts.

• They turn into coral reefs.

• They flourish and grow rapidly.

• They are unaffected.

What is the primary diet of sea otters that helps control the sea urchin population?

• Sea urchins

• Fish

• Seaweed

• Crabs

What is a trophic cascade?

• A type of ocean current

• A method of fishing

• A type of marine plant

• A powerful interaction that controls ecosystems

How did the reintroduction of wolves to Yellowstone affect the ecosystem?

• It had no effect.

• It caused the extinction of several species.

• It revived the entire ecosystem.

• It led to a decrease in plant life.

What effect do sea otters have on the behavior of sea urchins?

• Sea urchins stop reproducing.

• Sea urchins become more aggressive.

• Sea urchins seek refuge and change their diet.

• Sea urchins increase in number.

How much can the presence of sea otters increase the annual carbon storage of kelp forests?

• From 4.4 to 8.7 megatons

• From 10 to 20 megatons

• From 2.5 to 5 megatons

• From 1 to 2 megatons

What is one reason scientists advocate for the protection of sea otters?

• They are the largest marine mammals.

• They are a natural solution to climate change.

• They are a source of food.

• They are easy to domesticate.