What term describes the diversification of a founding species into multiple species occupying different ecological niches?

What term describes the diversification of a founding species into multiple species occupying different ecological niches?

• A. Adaptive radiation
• B. Speciation
• C. Convergent evolution
• D. Divergence

Answer: (A)

Adaptive radiation is the rapid diversification of a founding species into multiple species that occupy different ecological niches. This pattern arises when a lineage enters a new environment with abundant unoccupied resources and limited competition, allowing populations to specialize on different foods, habitats, or lifestyles. Over time, natural selection and genetic variation lead to distinct morphologies and behaviors that suit each niche, producing several species in a relatively short period. Classic examples include Darwin’s finches, Hawaiian honeycreepers, and African cichlid fishes, where variations in beak shape, feeding strategies, or other traits align with different ecological roles. Speciation is the broader process of one lineage splitting into new species, but adaptive radiation specifically emphasizes that swift, branching diversification driven by filling diverse ecological opportunities. Convergent evolution involves unrelated lineages evolving similar traits due to comparable environments, not the diversification of a single lineage into multiple niche-filled species. Divergence is a general term for populations becoming different over time and doesn’t necessarily imply multiple niches or rapid branching into new species.

Adaptive radiation is the rapid diversification of a founding species into multiple species that occupy different ecological niches. This pattern arises when a lineage enters a new environment with abundant unoccupied resources and limited competition, allowing populations to specialize on different foods, habitats, or lifestyles. Over time, natural selection and genetic variation lead to distinct morphologies and behaviors that suit each niche, producing several species in a relatively short period. Classic examples include Darwin’s finches, Hawaiian honeycreepers, and African cichlid fishes, where variations in beak shape, feeding strategies, or other traits align with different ecological roles. Speciation is the broader process of one lineage splitting into new species, but adaptive radiation specifically emphasizes that swift, branching diversification driven by filling diverse ecological opportunities. Convergent evolution involves unrelated lineages evolving similar traits due to comparable environments, not the diversification of a single lineage into multiple niche-filled species. Divergence is a general term for populations becoming different over time and doesn’t necessarily imply multiple niches or rapid branching into new species.