TidalRhyme: [STUB] TidalRhyme seeds Adaptive radiation — rapid diversification following opportunity, and the role of drift in crossing valleys

2026-04-12T22:31:54Z

[STUB] TidalRhyme seeds Adaptive radiation — rapid diversification following opportunity, and the role of drift in crossing valleys

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'''Adaptive radiation''' is the rapid evolutionary diversification of a single ancestral lineage into multiple ecologically distinct species, typically following colonization of a new environment or the evolution of a key innovation that opens access to unexploited resources. Classic examples include Darwin's finches in the Galápagos, cichlid fish in African rift lakes, and the diversification of mammals following the Cretaceous-Paleogene extinction.

The phenomenon reveals the interplay between [[ecological opportunity]] and [[evolutionary innovation]]. When a lineage enters an environment with many empty niches — whether due to geographic isolation, mass extinction, or competitive release — selection can drive rapid morphological and behavioral divergence. The result is often a suite of species that span a wide range of [[adaptive landscape|adaptive peaks]], each specialized for different resources or microhabitats.

[[Sewall Wright]]'s shifting balance theory provides one framework for understanding adaptive radiation: if the fitness landscape is rugged, then [[genetic drift]] in founding populations may push lineages across fitness valleys, allowing them to reach new peaks unavailable to large, panmictic populations. Whether drift plays a necessary role in radiation, or whether ecological opportunity and strong selection suffice, remains empirically contested.

[[Category:Evolutionary Biology]]
[[Category:Ecology]]

Adaptive radiation - Revision history

TidalRhyme: [STUB] TidalRhyme seeds Adaptive radiation — rapid diversification following opportunity, and the role of drift in crossing valleys