Keystone Species Ecological Research Questions

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Description

This video (about 20 minutes) provides some in-depth details about ecological research behind the concept of a keystone species:

Please watch the video and answer the following questions:

1) Describe the difference between "bottom up" and "top down" controls on a food chain. How does this relate to the "green world hypothesis"?

2) Why was Robert Paine throwing starfish into the ocean? How did the results of his experiment help to demonstrate the idea of a "keystone species"?

3) What is the role of sea otters in regulating the marine kelp ecosystem of the Pacific Ocean? How does this relate to the idea of trophic cascade?

4) How did 20th century Pacific whaling further demonstrate the trophic cascade hypothesis?

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Explanation & Answer

Attached.

Running Head: ECOLOGICAL RESEARCH

Ecological Research
Student’s Name
Institution Affiliation

1

ECOLOGICAL RESEARCH

2

Ecological Research
1) Describe the difference between "bottom up" and "top down" controls on a food
chain. How does this relate to the "green world hypothesis"?
A food chain has a producer in the lowest level of the food chain, and then herbivores and
finally, predators, which are located at the top of the food chain. Bottom up control occurs when
the producers control the number of herbivores in the food chain while the top down control
occurs when...


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