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Early stages of sympatric homoploid hybrid speciation in crater lake cichlid fishes

Published on by Melisa Olave
Homoploid hybrid speciation (i.e., hybrid speciation without a change in ploidy) has traditionally been considered to be rare in animals. Only few accepted empirical examples of homoploid hybrid speciation in nature exist, and in only one reported case (in insects) was it convincingly shown that this process occurred in complete sympatry. Here, we report an instance of sympatric homoploid hybrid speciation in Midas cichlid fishes in Crater Lake Xiloá, Nicaragua. The hybrid lineage, albeit at an early stage of speciation, has genomically and morphologically diverged from both of its two parental species. Together with a distinct stable isotope signature this suggests that this hybrid lineages occupies a different trophic niche compared to the other sympatric Midas species in Crater Lake Xiloá.

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Funding

Alexander von Humboldt Foundation

Zukunftskolleg Institute for Advanced Study (IAS) of the University of Konstanz

European Research Council advanced grant (ERC “GenAdap” 293700)

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