Given that grey wolves are a keystone species in North America, after their reintroduction into the Yellowstone ecosystem, which of the following events occurred?

Question

BlackTom AI · Accepted Answer

Question restatement: After the reintroduction of grey wolves into the Yellowstone ecosystem, which events occurred?
Option a: The plant composition became more varied and lush. This aligns with the trophic cascade idea: wolves reduce elk numbers and alter their grazing pressure, allowing vegetation to recover and diversify in some areas.
Option b: The number of predators in the ecosystem was increased. The introduction of wolves adds a top predator, thereby increasing the total predator presence in the system.
Option c: The number of prey in the ecosystem was reduced. With wolves predating on herbivores like elk, the prey population experiences increased mortality, leading to a reduction in their numbers over time.
Option d: All of the other options are correct. Given the explanations for a, b, and c, each statement reflects a known outcome of the wolf reintroduction and trophic cascade in Yellowstone.

Why each statement is considered:
- For option a, the chain from wolves to elk to vegetation explains why plant communities can respond with greater diversity and regrowth when grazing pressure diminishes, especially in riparian zones and aspen stands.
- For option b, the presence of gray wolves adds to the predator guild, raising the overall density of apex and mesopredators in the ecosystem and shifting dynamics among prey and other nonpredatory species.
- For option c, predation and increased fear can lower prey birth rates and survival, leading to a measurable drop in prey populations such as elk, which in turn influences vegetation and other trophic levels.
- Therefore, option d synthesizes the outcomes described in a–c, reflecting the interconnected nature of ecological cascades initiated by predator reintroduction.

Given that grey wolves are a keystone species in North America, after their reintroduction into the Yellowstone ecosystem, which of the following events occurred?单项选择题

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