Island Biogeography and Evolutionary Processes

The video covers the theory of island biogeography, explaining how island size and distance from the mainland affect species richness. Larger islands support more species due to greater ecosystem diversity, while proximity to the mainland facilitates colonization and genetic diversity. The video also discusses adaptive radiation, using Galapagos finches as an example of how species evolve to utilize different resources, reducing competition. The session concludes with practice questions to reinforce understanding of these concepts.

What is the primary focus of island biogeography?

• The study of weather patterns on islands

• The study of human impact on island environments

• The study of ecological relationships and community structures on islands

• The study of ocean currents around islands

Which of the following is NOT a factor influencing species richness on islands?

• The color of the island's soil

• Distance from the mainland

• Island size

• Ecosystem diversity

Why do larger islands tend to support more species?

• They have more diverse ecosystems and food sources

• They are closer to the mainland

• They have fewer predators

• They have a milder climate

What is the relationship between island size and species richness?

• No relationship

• Inverse relationship

• Positive correlation

• Negative correlation

How does the distance from the mainland affect species richness on an island?

• Distance does not affect species richness

• Closer islands have higher species richness

• Further islands have higher species richness

• Closer islands have lower species richness

What is the term used to describe the relationship where species richness decreases as the distance from the mainland increases?

• Neutral correlation

• Direct relationship

• Inverse relationship

• Positive correlation

What evolutionary process is exemplified by the Galapagos finches?

• Convergent evolution

• Natural selection

• Adaptive radiation

• Genetic drift

Why do species on islands experience unique evolutionary pressures?

• Due to the abundance of resources

• Due to stable environmental conditions

• Because of limited space and resources

• Because of constant human interference

What is the main advantage of adaptive radiation for species on islands?

• It decreases genetic diversity

• It increases the size of the island

• It reduces competition by utilizing different resources

• It allows species to migrate back to the mainland

Which of the following is a result of adaptive radiation in the Galapagos finches?

• Finches become extinct

• Finches evolve different beak sizes to utilize various food resources

• All finches have the same beak size

• Finches migrate to the mainland