ring species


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ring species

two populations whose ranges overlap and which do not freely interbreed but which are connected by a series of interbreeding populations in the form of a ring so that no true separation into different species can be made.
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The formation of ring species might provide an explanation of how speciation can occur despite ongoing gene flow.
The pattern of phenotypic variation in ring species implies that intraspecific variation can be substantial enough to lead to reproductive isolation and speciation (Irwin et al.
Historically a single model for the evolution of a ring species had been proposed, yet Patten (2010) suggested four possible ways that ring species form (Fig.
He discusses polyploidy of plants and ring species of birds to show how reproductive isolation--a necessary precondition for speciation--can occur.
The discovery of ring species such as the Larus gulls described above, (the Californian Ensatina salamanders or the Himalayan Greenish Warblers) challenges the reductionist notion of species.
Biogeography, cytochrome-b, evolutionary genetics, mitochondrial DNA, nucleotide sequence, Perognathus, restriction fragments, ring species, speciation.
A special case of geographic speciation is seen in ring species (polytypic species demonstrating circular overlap).
Greenish warbler populations encircling the Tibetan Plateau were viewed as evidence of a long-sought evolutionary phenomenon called a ring species (159: 40).
Stebbins' concept of a polytypic ring species was based on perceived primary intergradation between the sub-species where they met, with the exception of two instances of postulated secondary contact.
1992) that reexamines the ring species concept as it applies to Ensatina.
A new look at warblers in habitat that surrounds the Tibetan Plateau revives an old hope that the birds represent a long-sought evolutionary quirk called a ring species.
In theory, a ring species spreads around some obstacle, such as a mountain, lake, or plateau.