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Ring species as bridges between microevolution and speciation.

D E Irwin¹, J H Irwin, T D Price

¹Department of Biology, University of California, San Diego, La Jolla 92093, USA. darren.irwin@zooekol.lu.se

|February 13, 2002

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Ring species demonstrate how gradual changes drive speciation, even with gene flow. The Greenish warbler case shows parallel evolution leading to reproductive isolation through sexually selected traits.

Area of Science:

Evolutionary Biology
Speciation Research

Background:

Ring species illustrate evolutionary divergence and speciation processes.
They provide insights into how reproductive isolation can arise despite gene flow.

Purpose of the Study:

To review proposed ring species and their contribution to understanding speciation.
To analyze the Greenish warbler as a case study for ecological and geographical differentiation in speciation.

Main Methods:

Review of existing literature on ring species.
Analysis of the Greenish warbler (Phylloscopus trochiloides) as a model system.

Main Results:

Ring species exemplify divergence from a common ancestor and speciation with gene flow.
The Greenish warbler shows parallel evolution in morphology and ecology during northward expansions.

Related Experiment Videos

Divergent song structures in Greenish warblers led to reproductive isolation in Siberia.

Conclusions:

Speciation can occur with gene flow, particularly with divergent ecological selection and geographical differentiation.
Parallel ecological changes, not divergent ones, may drive divergence in sexually selected traits and speciation in ring species.