Page "Sympatric speciation" Paragraph 6
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Disruption may also occur in multiple-gene traits.
The Medium Ground Finch ( Geospiza fortis ) is showing gene pool divergence in a population on Santa Cruz Island.
Beak morphology conforms to two different size ideals, while intermediate individuals are selected against.
Some characteristics ( termed magic traits ) such as beak morphology may drive speciation because they also affect mating signals.
In this case, different beak phenotypes may result in different bird calls, providing a barrier to exchange between the gene pools.
A further well-studied circumstance of sympatric speciation is when insects feed on more than one species of host plant.
In this case insects become specialized as they struggle to overcome the various plants ' defense mechanisms.
( Drès and Mallet, 2002 )
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