Abel Ruiz-Giralt

@archaeorg.bsky.social

Archaeologist interested in human-environment interactions. Archaeobotany, ethnoarchaeology, data science. #archaeology #rstats Most of my work is available at: https://www.researchgate.net/profile/Abel-Ruiz-Giralt

📢 After quite some time working on this, our new paper is finally out! We propose an updated framework for Anthropic Activity Markers, showing how compositional data analysis and geostatistics can help us make more robust archaeological inferences from soil geochemistry. doi.org/10.1007/s108...

Anthropic Activity Markers 2.0: A Shift Towards Compositional Data Analysis - Journal of Archaeological Method and Theory

Anthropic Activity Markers (AAMs) were formalized over 10 years ago as a toolkit to infer human activities from biological and geochemical signatures preserved in sediments. This paper presents AAMs 2.0, a revised analytical framework that integrates compositional data analysis (CoDA) and geostatistics, as the appropriate statistical foundations for this approach. We first outline the theoretical motivation of this framework, demonstrating that treating geochemical concentrations as absolute values generates statistical artefacts that limit analytical reliability. Using the ethnoarchaeological dataset of Rondelli et al. (2014) as a test case, we illustrate how CoDA principles can be applied to revisit established interpretations. With this approach, we can identify meaningful compositional relationships without relying exclusively on heuristic element combinations, yielding results that are more statistically robust. Ultimately, AAMs 2.0 reframes activity markers as relational, ratio-based signals in space, providing a more rigorous foundation for archaeological inference.

doi.org

This morning, our PI Stefano Biagetti presented an overview of our work in the general session of the #SAfA2025. Come by the presentations by K. Rix (session #33) and A. Koutrompas (session #55) to learn more about our project!

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📢 New publication: "The genomics of t’ef and finger millet domestication and spread" by Mekonnen D.Z., Gomes A.I., Machado R.S.R. & Oliveira H.R., in Philosophical Transactions of the Royal Society B: Biological Sciences (2025, Vol. 380, Issue 1926). 🔗 More info: doi.org/10.1098/rstb...

The genomics of t’ef and finger millet domestication and spread | Philosophical Transactions of the Royal Society B: Biological Sciences

The Northern Highlands of Ethiopia and Eritrea (NHE) were a centre for food production in Africa, hosting one of the earliest agriculture-based complex societies on the continent. The NHE’s geographic...

doi.org

A massive study of 50,000 households over 1,000 archaeological sites provides ample evidence that inequality is not a "natural" outgrowth of sophistication. Instead, it is a political choice. Which means, kids, that we don't have to choose it. archaeologymag.com/2025/04/stud...

New study reveals wealth inequality was never inevitable

A recent study published in the journal PNAS is overturning traditional wisdom regarding the origins and inevitability of wealth inequality

archaeologymag.com

I contributed to the special issue of PAGES magazine, "Early Human Traces: Landscape Openness Proxies Across Space and Time," with a short article on the identification of charcoal from archaeological sites to detect human-induced vegetation openings 🪵🔥🌳🌴🌿 1/5 pastglobalchanges.org/publications...

Using archaeological macrocharcoal to detect different degrees of anthropogenic landscape opening and woodland management | PAGES

pastglobalchanges.org

Delighted that this paper came out as part of a PNAS special feature on “The Global Dynamics of Inequality over the Long Term” where together with a team of 27 scientists we collected and analysed a sample of over 53,000 houses from all five continents. www.pnas.org/doi/10.1073/...

Toward multiscalar measures of inequality in archaeology | PNAS

The Gini coefficient is a statistical measure commonly used to characterize distributions of socioeconomic quantities. Archaeologists and social sc...

pnas.org