Jan 31, 2016

Hybrid asexuality as a primary reproductive barrier: on the interconection between asexuality and speciation

BioRxiv : the Preprint Server for Biology
Karel JankoLukas Choleva


Speciation usually proceeds in a continuum from intensively hybridizing populations until the formation of irreversibly isolated species. Restriction of interspecific gene flow may often be achieved by gradual accumulation of postzygotic incompatibilities with hybrid infertility typically evolving more rapidly than inviability. A reconstructed history of speciation in European loaches (Cobitis) reveals that accumulation of postzygotic reproductive incompatibilities may take an alternative, in the literature largely neglected, pathway through initiation of hybrids' asexuality rather than through a decrease in hybrids' fitness. Combined evidence show that contemporary Cobitis species readily hybridize in hybrid zones, but their gene pools are isolated as hybridization produces infertile males and fertile but clonally reproducing females that cannot mediate introgressions. Nevertheless, coalescent analyses indicated intensive historical gene flow during earlier stages of Cobitis diversification, suggesting that non-clonal hybrids must have existed in the past. Revealed patterns imply that during the initial stages of speciation, hybridization between little diverged species produced recombinant hybrids mediating gene flow, but gro...Continue Reading

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Mentioned in this Paper

Biochemical Pathway
Nucleic Acid Hybridization Procedure
Somatic Diversification of Immunoglobulins
Transcription Initiation

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