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Difficulty: MediumAdaptive Radiation and Mechanisms of Speciation

A single founder species of finch colonizes a newly formed archipelago offering several unoccupied ecological niches, including hard seeds, nectar sources, and wood-boring insects. Over generations, this ancestral lineage gives rise to multiple distinct species, each possessing specialized beak morphologies adapted to a specific food source. Which evolutionary phenomenon is best illustrated by this rapid diversification?

  1. A
    Convergent evolution
  2. Adaptive radiationAnswer
  3. C
    Inheritance of acquired traits
  4. D
    Cryptic coloration

Answer

Adaptive radiation
Adaptive radiation describes the process where a single ancestral species rapidly evolves into a variety of forms that occupy different ecological niches. The classic example is Darwin's finches on the Galapagos Islands, where different beak shapes evolved to exploit diverse food resources.

Step-by-Step Solution

1
Analyze the scenario details
A single ancestral species colonizes an isolated habitat and splits into multiple specialized species.
Identifying whether the process involves one lineage diverging or multiple unrelated lineages converging is essential.
2
Evaluate ecological conditions
The availability of diverse, unoccupied ecological niches drives morphological adaptation (such as specialized beaks).
Ecological opportunity is the primary trigger for rapid speciation from a common ancestor.
3
Match with evolutionary mechanisms
The diversification of one species into many niche-adapted species is defined as adaptive radiation.
Adaptive radiation specifically accounts for ancestral divergence across available ecological roles.

Key Concept

Adaptive Radiation
Estimated Time:1m 0s
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Topics

Adaptive Radiation and Mechanisms of Speciation

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