A generalized pioneer species is introduced to two different islands. Island P features multiple diverse ecological niches that are currently unoccupied. Island Q has the exact same diverse niches, but they are fully occupied by a highly competitive, established community of endemic species. What is the most likely long-term ecological outcome for the introduced species on each island?

Step-by-step solution

The correct outcome is Island P: Adaptive radiation; Island Q: Competitive exclusion. On Island P, the introduced species encounters diverse, unoccupied niches. Without interspecific competition, the population can expand and diversify to exploit the various available resources, leading to adaptive radiation. On Island Q, the niches are already fully occupied by highly competitive endemic species. According to Gause's competitive exclusion principle, two closely related species competing for the same resources cann