Happy to share this paper with @samyeaman.bsky.social, now published in Molecular Biology and Evolution!
Using replicated hybrid zones, we explored patterns of local adaptation and introgression in spruce and found strong signals even at very fine geographical scales!
doi.org/10.1093/molb...
I had finally come to acknowledge the "reuse" concept, but the constant push for the “rapid and independent” narrative is wearing me out.
"the origin of standing genetic variation in the sea is interesting and requires further stud" Isn't it simply a migration (of old variants that long persisted in freshwater populations) - selection balance?
Reply "understanding early speciation requires recognizing the evidence that adaptation is rapid and repeatable" Really?
www.pnas.org/doi/abs/10.1...
Evergreen debate over the stickleback narrative: recent, rapid, independent. One more piece on the “coupling” side: two timeframes (old adaptation, recent spatial redeployment), not so independent.
www.pnas.org/doi/full/10....
A sedge. It may look unassuming but its genome has several unusual features.
Why do the chromosomes of cyperids (sedges & rushes) split and fuse so regularly on evolutionary timescales?
Is it because they have so many centromeres?
Our new preprint, the first major paper of my PhD, addresses this question. 🧵⬇️ 1/12
www.biorxiv.org/content/10.6...
Academics often lament that hardly any master’s projects get published. The student moves on. Other research takes priority. No one has time to do the final analyses. Here I tell how one master’s project was, through persistent teamwork, finally carried over the finish line: go.nature.com/4aKs7N3
Un poste MCF en génomique évolutive / écologie moléculaire à ECOBIOP - Université de Pau #PopGen 👇
urlr.me/rVQmN6
April Fools’ Day is coming early this year, but really, any day is a good day to poke fun at the system.
Well done @russcd.bsky.social
Un poste MCF en évolution de la biodiversité marine à l'Université de La Réunion UMR Entropie #MarEvol 👇
www.univ-reunion.fr/wp-content/u...
We are offering a fully funded two-year postdoctoral position focused on sex chromosome evolution and speciation in the *Jaera albifrons* species complex. Please find the advertisement attached. We welcome applications from interested candidates. Join us :-)
David Marques was an amazing speciation genomics researcher, a passionate birder, and a wonderful friend, husband, and father. May he rest in peace. www.nature.com/articles/s41...
New out: A Beginner’s Guide to Structural Variants in Eco-Evolutionary Population Genomics.
We outline how to detect and analyse SVs, discuss key challenges, and provide a practical framework for population-level studies
A resource for students entering SV research.
doi.org/10.1111/mec....
I am hiring a Postdoc (18 months contract in Montpellier, France) to study how polyploidy affects sex chromosomes in the plant Silene latifolia, using bioinformatic analyses of RNA-seq and DNA-seq data. Deadline for applications March 24th. euraxess.ec.europa.eu/jobs/412961
New work from the lab: Miles @milesroberts.bsky.social tried out machine learning to estimate sweep times to fixation and (spoilers) it didn't really help www.biorxiv.org/content/10.6... As always, we'd appreciate any feedback!
Results of this work suggest 1- that episodic windows of adaptive introgression can generate new admixed lineages and 2- repeatability arises from multi-genic positive selection favouring the same introgressed variants borrowed from semi-isolated related species.
Here we found three admixed lineages, each derived from three parental species. 3-way admixture !
We show that repeatability is not primarily driven by systematic depletion of minor ancestry. It is instead shaped by recurrent enrichment of the same shared minor-parent ancestry peaks.
With only two parents, we lack one degree of freedom. When we observe repeatable patterns of ancestry across hybrid zones, we can map chromosome regions affected by selection. However, we cannot determine the direction of selection. Is foreign ancestry purged or favoured?
A more technical point, but an even more fascinating one.
In hybridization genomics, we usually scan admixed genomes for:
• minor ancestry deserts → candidate barrier loci
• minor ancestry peaks → adaptive introgression
But we almost always study 2-parent admixture.
We often think of hybridisation as occurring after long periods of allopatry. In this case, however, isolation is maintained in sympatry, with species barriers suddenly breaking down at a range limit.
Cryptic coral species can remain reproductively isolated in the same reefs with only minimal gene exchange for over 300 KY ... and then suddenly interbreed at the edge of their range.
For a fan of post-glacial secondary contacts as I am, this was a real surprise.
A huge thank you to Iva and Cynthia @seaprof.bsky.social and the all Riginos lab for inviting me to make a modest contribution to this study.
My first coral paper 🌊🪸 🎉 A dream come true 😊.
I really encourage you to read it #MustRead
Two major take-home messages for hybridization genomics 👇
Table coral
Three-way hybridization of table corals in the Acropora hyacinthus group from the southern Great Barrier Reef results in parallel adaptive introgression. Check out our new preprint: doi.org/10.64898/202...
#CoralSky #MarEvol #coral #popgen #consgen #genomics
Led by Iva Popovic, with Katharine Prata, @melissanaugle.bsky.social le.bsky.social, @ilhabyrne.bsky.social habyrne.bsky.social, Sam Howitt, Tom Bridge, Vero Mocellin, Emily Howells, Line Bay & @couplingdmi.bsky.social lingdmi.bsky.social
#RRAP #AIMS @uq-cbcs.bsky.social
This is heartbreaking news. My thoughts are with you and with his loved ones. May he be fondly remembered.
New paper out: “allopatric” Drosophila species aren’t so allopatric after all. We show that most currently allopatric species pairs probably overlapped in the past and exchanged genes at levels similar to sympatric pairs. @evolletters.bsky.social
doi.org/10.1093/evle... [1/6]
Two-way native-invasive introgression and structural variants in invasive moth species. Admixture and exchange of adaptive alleles can facilitate adaptation, but this is also true for pests. Amazing work by @henrylnorth.bsky.social, @chrisjiggins.bsky.social and others, with a lot to think about.
Excited about our new preprint showing bidirectional adaptive introgression between invasive and native crop pests over ecological timescales www.biorxiv.org/content/10.6...
Happy to highlight an essay I wrote together with @marcdemanuel.bsky.social,
@natanaels.bsky.social and Anastasia Stolyarova, trying to think through what sets the mutation rate of a cell type in an animal species: www.biorxiv.org/content/10.6... 1/n
New preprint from the lab on bioRxiv, led by Grace Zhang!
Quick summary: Lots of studies have examined costs and benefits associated with resistance. Most focus on a single stressor, leaving unclear how resistance shapes fitness and evolution under multiple interacting stresses.