Understanding Ecosystems and Human Impact

The video explores the interconnectedness of global ecosystems, highlighting the intricate networks of species and environments. It discusses the roles of various organisms in food webs, the importance of primary producers, and the impact of human activities on natural systems. The video emphasizes the need for sustainable solutions to preserve ecosystem resilience and balance.

What is the primary theme of the introduction section?

• The decline of global trade

• The interconnectedness of human and natural networks

• The evolution of species over time

• The isolation of ecosystems

In marine ecosystems, what role do sea otters play?

• They help control the sea urchin population

• They are primary producers

• They are the main predators of kelp

• They provide shelter for small fish

What is the significance of kelp in marine ecosystems?

• It is a primary producer that supports diverse marine life

• It is a predator of small fish

• It is a migratory bird species

• It is a type of sea urchin

How do Douglas firs contribute to their ecosystem?

• By producing energy through photosynthesis

• By reducing the amount of sunlight

• By consuming other plants

• By migrating to different regions

What is the role of fungi in the relationship with Douglas firs?

• They supply water and nutrients to the trees

• They act as predators to the trees

• They decompose the trees

• They provide energy-rich sugars to the trees

How do salmon contribute to nutrient cycling in ecosystems?

• By providing shelter for small fish

• By transporting nutrients from the ocean to inland forests

• By reducing the number of predators

• By consuming large amounts of carbon dioxide

What is the impact of phytoplankton on carbon dioxide levels?

• They absorb carbon dioxide during photosynthesis

• They have no effect on carbon dioxide

• They increase carbon dioxide levels

• They release carbon dioxide into the atmosphere

What is a major consequence of human agricultural practices?

• Simplification of food webs

• Decreased human population

• Increased biodiversity

• Stabilization of ecosystems

How have invasive species affected ecosystems like San Francisco Bay?

• They have increased native species populations

• They have had no impact

• They have decreased water pollution

• They have altered the existing food web

What is a suggested solution for preserving ecosystem resilience?

• Eliminating all human activity

• Reducing biodiversity

• Establishing protected areas

• Increasing urbanization