Arctic Ecosystem and Polar Cod

The video discusses the impact of climate change on Arctic sea ice and its consequences on the ecosystem. It highlights the diversity of life supported by sea ice, focusing on microalgae and polar cod. The polar cod's adaptations to the Arctic environment and their role in the food web are explored. The Mosaic project is introduced, emphasizing its research on the Arctic ecosystem and the importance of sea ice. The video concludes with the significance of understanding these changes for future predictions and mitigation strategies.

What significant change has occurred in the Arctic sea ice cover over recent years?

• It has increased by half.

• It has remained the same.

• It has decreased by half.

• It has doubled in size.

What is the primary role of microalgae in marine food webs?

• They provide oxygen to the atmosphere.

• They are a source of carbon for the community.

• They act as predators in the ecosystem.

• They decompose organic matter.

Why are polar cod considered crucial in the Arctic ecosystem?

• They are the largest fish in the Arctic.

• They are the top predators in the Arctic.

• They are the main prey for birds and seals.

• They are the primary producers in the food web.

What unique adaptation helps polar cod survive in freezing temperatures?

• Thick scales

• Antifreeze compound in their blood

• Migration to warmer waters

• Ability to hibernate

What hypothesis was proposed about the movement of polar cod?

• They hitchhike with sea ice across the Arctic.

• They migrate to the equator during winter.

• They follow the sun's path.

• They remain stationary throughout the year.

What is the significance of the MOSAiC expedition in studying polar cod?

• It tracks the migration of polar bears.

• It follows the trajectory of sea ice to study polar cod.

• It measures the temperature of the Arctic Ocean.

• It studies the behavior of Arctic birds.

What is the primary food source for polar cod during summer?

• Small crustaceans

• Plankton

• Seaweed

• Large fish

How do researchers sample the food sources of polar cod?

• Through satellite imagery

• By observing from ships

• With underwater robots and nets

• Using fishing rods

What percentage of carbon in polar cod tissue is traced back to ice algae?

• 75%

• 50%

• 25%

• 100%

What is a major risk to the Arctic ecosystem due to climate change?

• Rise in sea levels

• Expansion of sea ice

• Disappearance of unique biodiversity

• Increase in polar bear population