Question

Consider the role of Keystone species in an ecosystem. Which of the following statements is correct?

1. Keystone species are always the most abundant species in an ecosystem.
2. The destruction of keystone species can lead to the collapse of the entire ecosystem.
3. Keystone species play a critically important role in not maintaining the structure and function of an ecosystem.

• A. ii only
• B. ii, iii
• C. iii only
• D. All

Answer 1

Answer:

A. ii only

• Keystone species are vital components of an ecosystem, disproportionately impacting their environment relative to their abundance.

• Their presence or absence has a ripple effect, influencing many other species and the overall ecosystem structure.

• Examples include sea otters, which control sea urchin populations, preventing kelp forest destruction, or wolves, which can regulate herbivore populations, influencing plant communities.

• Their removal can trigger a trophic cascade, leading to significant ecosystem changes or collapse.