News

In search of the Goldilocks zone for hybrid speciation II: hard times for hybrid speciation

Encontro Scientia with Alexandre Blanckaert (Evolutionary Genetics)

13 April 2023 . 12h00 (GMT)
Room 2.2.12, Faculty of Sciences of the University of Lisbon

Hybridization opens a unique window for observing speciation mechanisms and is a potential engine of speciation. One controversially discussed outcome of hybridization is homoploid hybrid speciation by reciprocal sorting, where a hybrid population maintains a mixed combination of the parental genetic incompatibilities, preventing further gene exchange between the newly formed population and the two parental sources. Previous work showed that, for specific linkage architectures (i.e., the genomic location and order of hybrid incompatibilities), reciprocal sorting could reliably result in hybrid speciation. Yet, the sorting of incompatibilities creates a risk of population extinction.

To understand how demographic consequences of the purging of incompatibilities interact with the formation of a hybrid species, we model an isolated hybrid population resulting from a single admixture event. We study how population size, linkage architecture and the strength of the incompatibility affect survival of the hybrid population, resolution/purging of the genetic incompatibilities and the probability of observing hybrid speciation. We demonstrate that the extinction risk is highest for intermediately strong hybrid incompatibilities. In addition, the linkage architecture displaying the highest hybrid speciation probabilities changes drastically with population size. Overall, this indicates that population dynamics can strongly affect the outcome of hybridization and the hybrid speciation probability.

 

Join us IN PERSON (FCUL Room 2.2.12) or, if you are located in Azores or at MUHNAC, by Zoom (LINK - password: 429614)!

We have been experiencing some technical issues regarding the authentication/connection to the Zoom platform through FCCN. For that, we apologise for any difficulties during the transmission.


Tags: EG Encontro Scientia hybridization speciation

Other Articles

  • Implementing an integrated system to enhance genomic surveillance of emerging and reemerging viral threats in South America

    Conference Implementing an integrated system to enhance genomic surveillance of emerging and reemerging viral threats in South America

  • The evolution of developmental biases explains 80 million years of divergent phenotypic rates

    Conference The evolution of developmental biases explains 80 million years of divergent phenotypic rates

  • Genomic dynamics and evolution of bacteria and microbial communities

    Conference Genomic dynamics and evolution of bacteria and microbial communities

  • Soil thermophilic as plant growth promoting rhizobacteria

    Conference Soil thermophilic as plant growth promoting rhizobacteria

  • EU-funded LIFE projects influence in land use/land cover changes in insular ecosystems: the case-study of São Miguel island (Azores)

    Conference EU-funded LIFE projects influence in land use/land cover changes in insular ecosystems: the case-study of São Miguel island (Azores)