Keystone Species and Their Impact on Ecosystem Dynamics

The video discusses the concept of keystone species, introduced by ecologist Robert Payne. Keystone species are crucial for maintaining the diversity, stability, and structure of ecosystems. The video explains how the removal of a keystone species, like the tiger, can lead to trophic cascades and ecosystem imbalance. It also categorizes keystone species into predators, prey, ecosystem engineers, mutualists, and producers, providing examples such as tigers, African elephants, and honeybees. The importance of conserving these species for ecosystem sustenance is emphasized.

Who introduced the concept of keystone species?

• Charles Darwin

• E.O. Wilson

• Robert Payne

• Jane Goodall

What happens to the prey population if a keystone predator like the tiger is removed?

• It becomes extinct

• It remains the same

• It decreases

• It increases

What is a trophic cascade?

• A type of food chain

• A method of species conservation

• A chain reaction in an ecosystem

• A type of waterfall

Which of the following is NOT a type of keystone species?

• Predators

• Ecosystem engineers

• Mutualists

• Parasites

Which animal is an example of an ecosystem engineer?

• Snowshoe hare

• Shark

• Beaver

• Tiger

How do African elephants act as ecosystem engineers?

• By building nests

• By overgrazing grasslands

• By pollinating plants

• By hunting prey

Which of the following is a mutualist keystone species?

• Grizzly bear

• Wolf

• Honeybee

• Starfish

What role do producers like the fig tree play in an ecosystem?

• They are top predators

• They provide food throughout the year

• They are ecosystem engineers

• They are prey for large animals

Which of the following is an example of a keystone predator?

• Saguaro cactus

• Fig tree

• Antarctic krill

• Tiger

Why is it important to conserve keystone species?

• They are the most numerous species

• They stabilize ecosystems

• They have no impact on ecosystems

• They are the most beautiful species