Chapter 28: Problem 7

What is a keystone species? How can a keystone species within a community be identified?

Short Answer

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A keystone species is a plant or animal crucial for maintaining the structure and stability of an ecosystem. To identify a keystone species, examine their disproportionate effect on the ecosystem, their position in the trophic level, their interactions with other species, and observe the ecosystem with and without the species. Consulting scientific literature and empirical evidence can also aid in identification. Identifying keystone species is essential for effective ecosystem management and conservation.

Step by step solution

Definition of Keystone Species

A keystone species is a plant or animal that plays a crucial role in maintaining the structure and stability of an ecosystem. The presence of a keystone species is critical for the survival of many other organisms and the overall health of the ecosystem. The loss of a keystone species can have a significant impact on the diversity and stability of the ecosystem, often leading to a cascade of negative effects on other species and the environment.

Identifying a Keystone Species

There are several characteristics and factors that can help in identifying a keystone species within a community. Here are some steps to follow: 1.

Look for disproportionate effects on the ecosystem

Examine the roles and functions of different species in the community. A keystone species often has a disproportionately large effect on the ecosystem relative to its abundance or biomass. This means that even though the species might be small in number, it significantly impacts the entire ecosystem. 2.

Examine the trophic level

Consider where the species falls within the food web or trophic level – producers, primary consumers, secondary consumers, and so on. Keystone species can be found across different trophic levels, but they often occupy crucial positions in the food web, meaning that their loss could lead to drastic changes in the ecosystem. 3.

Evaluate species interactions

Assess how different species within the community interact with each other. Pay attention to those that have a role in maintaining ecosystem stability, such as predators that help control population sizes of prey species, or a plant species that supports many herbivores by providing essential resources. 4.

Observe the ecosystem with and without the species

Study the ecosystem with and without the presence of the potential keystone species. If removing or adding the species results in significant changes in the diversity and stability of the community, it may be a keystone species. 5.

Consult scientific literature and empirical evidence

Research the scientific literature and look for previous research and empirical evidence that supports the importance and role of the potential keystone species within the community. Collaborate with other researchers and ecologists to gather data and validate the identification of a keystone species.

Conclusion

Identifying a keystone species within a community involves examining the species' roles, functions, and interactions within the ecosystem. This process could involve observing the ecosystem with and without the species, analyzing trophic levels, evaluating species interactions, and consulting scientific literature for empirical evidence. The identification of a keystone species can contribute to effective ecosystem management and conservation efforts.

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What is a keystone species? How can a keystone species within a community be identified?

Short Answer

Step by step solution

Definition of Keystone Species

Identifying a Keystone Species

Look for disproportionate effects on the ecosystem

Examine the trophic level

Evaluate species interactions

Observe the ecosystem with and without the species

Consult scientific literature and empirical evidence

Conclusion

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