What will most likely happen if a nonnative species is introduced into a stable ecosystem?

• A. It may disrupt the balance of the ecosystem by outcompeting native species for resources.
• B. It will increase the genetic diversity of only the native species without affecting population sizes.
• C. It will always become extinct immediately due to lack of adaptation.
• D. It will have no effect on the ecosystem because all species can coexist equally.

Answer: (A)

Verified step by step guidance

1. Understand the concept of a nonnative species: A nonnative species, also known as an invasive species, is an organism introduced to an ecosystem where it does not naturally occur. These species can sometimes thrive in the new environment and disrupt the balance of the ecosystem.
2. Analyze the potential impact of a nonnative species: Nonnative species often compete with native species for resources such as food, water, and habitat. If the nonnative species has a competitive advantage (e.g., faster reproduction, fewer predators), it may outcompete native species, leading to population declines or even extinction of native species.
3. Evaluate the incorrect options: The statement that a nonnative species will always become extinct immediately due to lack of adaptation is incorrect because some nonnative species can adapt well to new environments. Similarly, the idea that it will have no effect on the ecosystem is incorrect because competition for resources can disrupt the ecosystem's balance. Lastly, the claim that it will increase genetic diversity of only native species without affecting population sizes is also incorrect, as genetic diversity changes are not guaranteed and population sizes are often affected.
4. Focus on the correct answer: The most likely outcome is that the nonnative species may disrupt the balance of the ecosystem by outcompeting native species for resources. This is supported by numerous ecological studies showing the impact of invasive species on biodiversity and ecosystem stability.
5. Conclude with the importance of ecosystem balance: Stable ecosystems rely on a delicate balance of interactions among species. Introducing a nonnative species can upset this balance, leading to cascading effects on the food web, resource availability, and overall ecosystem health.