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Posts by Andy Walton

Post-Doctoral Research Fellow in Ancient Environmental DNA:Whiteknights Reading UK We are seeking a highly motivated Post-Doctoral Research Fellow to join our research team at Reading, focusing on sedimentary DNA (sedaDNA / environmental DNA) from soils and sediments from the project’s case study regions in Spain and North Africa. You will contribute to the reconstruction of past landscapes and human-environment interactions through the analysis of sedimentary DNA. This includes analysing samples from terraces, irrigated fields and archaeological sites, and using eDNA metagenomics and metabarcoding approaches for multi-species detection, with the aim of characterising changing plant and animal species diversity and richness over time. The position will involve fieldwork, laboratory work, data analysis, and collaboration with an interdisciplinary team of archaeologists, palaeoecologists and historians.

🧬SedaDNA Postdoc position💥 2 years Starts 2026, apply by 1st March.
Join Aleks Pluskowski at Reading & me at NHM. jobs.reading.ac.uk/Job/JobDetai...

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Davis Summer Population Genomics Program Want to learn population genetics? Please fill out this form to indicate your potential interest in a 2-week intensive online summer population genetics course taught by Jeffrey Ross-Ibarra and Graham...

Fun news! @gcbias.bsky.social and I are teaching a 2-week online population genetics workshop this summer to raise money for the Center for Population Biology at UC Davis. We're trying to gauge interest -- please fill this out if you might be interested! And please share broadly!

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Summer internships

Are you a bachelor or master student anywhere in the world, and would like to come to us to work full-time on a supervised research project? Applications for the 2026 MPIA Summer Internship are open now!

4 months ago 31 39 0 5

There was some stable isotope analysis (Strontium and O2/N2) done in 2013 which suggests she spent her early life in the south of the UK and probably and ate a lot of seafood.

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Beachy Head Woman: clarifying her origins using a multiproxy anthropological and biomolecular approach The skeletal remains of an individual colloquially referred to as Beachy Head Woman (BHW) were re-discovered in the Eastbourne Town Hall collection in…

🏺Stellar work by @andyjmwalton.bsky.social and colleagues. Previous craniometric analysis of the Beachy Head Woman, a Roman burial from near Eastbourne Sussex, had suggested she had ancestry from Africa. Ancient DNA analysis finds no evidence for this...

www.sciencedirect.com/science/arti...

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Lastly, thanks to @selinabrace.bsky.social , William Marsh and the whole team!

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ScienceDirect.com | Science, health and medical journals, full text articles and books.

It's an immense privilege to be able to study samples from people's remains and it was important that we worked hard to uncover as much of Beachy Head Woman's story as possible. Have a read of the whole story here: www.sciencedirect.com/science/arti...

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Bioanthropology is as a field is also moving away from methods that classify individuals into discrete ancestral categories from the shape of their skulls, which risked reifying outdated notions of the biological reality of race

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The initial craniofacial analyses were done in good faith (and the original researchers continued to be involved & are co-authors on this paper) but were conducted without access to both the huge genetic datasets and ancient DNA sequencing technology available to us just a decade later

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There's extensive evidence for population movement from Northern Africa into Britain during the Roman period - these results don't refute that. What they do is show how much the interpretations of individuals from the past can change as technology & methods advance

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Combined with stable isotope results (she likely ate lots of seafood and grew up on the south coast), it's likely she came from area local to Eastbourne

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Last year, myself and a team at @nhm-london.bsky.social were able to use newly developed molecular technology and recently published genomes to re-sequence her DNA. This shows no evidence of recent African (or Mediterranean) ancestry and, genetically, she looks most similar to rural Roman-era brits

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Beachy Head Woman (BHW) first garnered attention in 2012 when craniofacial analysis suggested she had recent African ancestry and might have been the 'first black briton known to us'. However, her story shifted when initial DNA sequencing indicated she may have come from the Mediterranean

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Beachy Head Woman may be ‘local girl from Eastbourne’, say scientists Exclusive: DNA advances show Roman-era skeleton, once hailed as first black Briton, came from southern England

Out today, we present high quality ancient DNA data for Beachy Head Woman for the first time. Hers is a story about changing interpretations, science communication, and cutting-edge genetic technology...🧵
www.theguardian.com/science/2025...

4 months ago 5 2 1 1
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An unexpected positive of our truck breaking down in the outback was being able to make Science Week in Alice Springs.

Such a cool set of events showcasing some of the amazing science going on in the NT. Special thanks to @reddirtpalaeo.bsky.social for putting up with my molecular palaeo questions!

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Thanks so much to @adamrutherford.bsky.social, Alex Aylward and Mark Thomas for the fantastic supervision and making this a great first PhD project!

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As a geneticist by training it was daunting setting out to write a paper about the history of science, but it has been really thought provoking considering how theoretical models are conceived and what embedded assumptions we continue to apply.

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The history of panmixia is a 200 yr tour from Darwin to the usual PopGen suspects - Galton, Pearson, Hardy and Fisher. We argue that the assumption of random mating wasn’t just a mathematical simplification and had already become embedded in the field by the Modern Synthesis.

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One of the most common assumptions in population genetics models is that organisms mate with each other totally at random (or “panmixia”). However this almost certainly isn’t the case in nature, so we wanted to find out where this assumption came from.

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Much of how we study evolution and the genetic diversity in nature is through mathematical models. These simplify the complexity of the natural world by making assumptions about it.

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The History of the Panmictic Population Concept and Its Legacy in Contemporary Population Genetics ABSTRACT The panmictic population concept is at the heart of population, evolutionary and conservation genetics. However, in nature, true panmictic populations are vanishingly rare. As an idea conce...

Really excited to share the first paper from my PhD - it’s all about assumptions in modelling and the history of early population genetics… 🧵

doi.org/10.1111/ahg....

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The History of the Panmictic Population Concept and Its Legacy in Contemporary Population Genetics ABSTRACT The panmictic population concept is at the heart of population, evolutionary and conservation genetics. However, in nature, true panmictic populations are vanishingly rare. As an idea conce...

🚨 New paper klaxon! 🚨

The History of the Panmictic Population Concept and Its Legacy in Contemporary Population Genetics

Quite niche admittedly, one for the historians of evolutionary thought, and population geneticists.

doi.org/10.1111/ahg....

8 months ago 60 23 5 4
DOMESTIC book launch + performance + discussion

#sciencebluesky New here 👋

Really excited to be speaking at the launch of Katrina Stamatopoulos's amazing DOMESTIC this evening! Please do come along if you're interested in art, #genetics and #Evolution.

www.eventbrite.co.uk/e/domestic-t...

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