ICR2-Artigos (em revistas ou actas indexadas)
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- Bayesian inference of sex-specific mortality profiles and product yields from unsexed cattle zooarchaeological remainsPublication . Diekmann, Yoan; Gillis, Rosalind; Lu, Ziye; Rudzinski, Anna; Iorio, Maria De; Thomas, Mark G.Zooarchaeological age-at-death profiles for domesticated ruminants can be inferred from tooth eruption, replacement, and wear. These profiles contain important information on slaughter management and have been used informally to infer the goals of past husbandry strategies. In principle, sex-specific survival curves could inform on various productivity parameters, including herd growth rates and sustainability, milk and meat yields, macronutrient and calorie yields, and feed consumed. Knowledge of these parameter values would allow identification of differences in husbandry economics in different archaeological contexts. However, archaeological age-at-death profiles are rarely sex-specific and are often derived from small sample sizes. As such, challenges remain in inferring sex-specific survival curves using explicit models that account for sampling uncertainty. We present a Bayesian inference approach for inferring sex-specific survival curves from unsexed cattle zooarchaeological age-at-death profiles that can accommodate data from any combination of age class boundaries. Our approach relies on the assumption that asymmetric sex-specific slaughter leads to a change in sex ratio over time, which we inform from slaughter practices in modern unimproved cattle herds. By combining inferred sex-specific archaeological survival curves with ethnographic productivity data from modern unimproved cattle, we are able to estimate herd growth rate, milk and meat yields, macronutrient and calorie yields, and feed consumed per animal. We apply our approach to zooarchaeological age-at-death profiles previously proposed to prioritise milk or meat production and to a set of profiles from ten Neolithic sites located across Europe. We infer that there was scope for improvement in prehistoric slaughter management.
- Early oldowan technology thrived during pliocene environmental change in the Turkana Basin, Kenya.Publication . Braun, David R.; Palcu Rolier, Dan V.; Advokaat, Eldert L.; Archer, Will; Baraki, Niguss G.; Biernat, Maryse D.; Beaudoin, Ella; Behrensmeyer, Anna K.; Bobe, René; Elmes, Katherine; Forrest, Frances; Hammond, Ashley S.; Jovane, Luigi; Kinyanjui, Rahab N.; de Martini, Ana P.; Mason, Paul R D.; McGrosky, Amanda; Munga, Joanne; Ndiema, Emmanuel K.; Patterson, David B.; Reeves, Jonathan S.; Roman, Diana C.; Sier, Mark J.; Srivastava, Priyeshu; Tuosto, Kristen; Uno, Kevin T.; Villaseñor, Amelia; Wynn, Jonathan G.; Harris, John W. K.; Carvalho, SusanaApproximately 2.75 million years ago, the Turkana Basin in Kenya experienced environmental changes, including increased aridity and environmental variability. Namorotukunan is a newly discovered archaeological site which provides a window into hominin behavioral adaptations. This site lies within the upper Tulu Bor and lower Burgi members of the Koobi Fora Formation (Marsabit District, Kenya), presently a poorly understood time interval due to large-scale erosional events. Moreover, this locale represents the earliest known evidence of Oldowan technology within the Koobi Fora Formation. Oldowan sites, older than 2.6 million years ago, are rare, and these typically represent insights from narrow windows of time. In contrast, Namorotukunan provides evidence of tool-making behaviors spanning hundreds of thousands of years, offering a unique temporal perspective on technological stability. The site comprises three distinct archaeological horizons spanning approximately 300,000 years (2.75 − 2.44 Ma). Our findings suggest continuity in tool-making practices over time, with evidence of systematic selection of rock types. Geological descriptions and chronological data, provide robust age control and contextualize the archaeological finds. We employ multiple paleoenvironmental proxies, to reconstruct past ecological conditions. Our study highlights the interplay between environmental shifts and technological innovations, shedding light on pivotal factors in the trajectory of human evolution.
- From stone to tool: how raw materials influenced upper palaeolithic technology in southwestern Iberia (Vale Boi)Publication . Belmiro, Joana; Bicho, Nuno; Terradas, Xavier; Cascalheira, JoãoThe Upper Palaeolithic (UP) of westernmost Europe was marked by technological and cultural transformations and abrupt climatic shifts. The Iberian Peninsula, particularly southwestern Iberia, served as a refugia and key eco-cultural niche, making it a key region for UP studies. Vale Boi, the only site in southwestern Iberia with a nearly complete UP sequence, provides critical insights into technological, economical and mobility patterns over time. This study examines lithic raw material procurement and technological organisation at Vale Boi, focusing on the differences between local and non-local cherts. We analysed chert assemblages from Gravettian, Proto-Solutrean, and Solutrean levels, integrating previously published techno-typological and raw material macroscopic and petrographic data. Our results indicate that non-local cherts were intensively reduced. The presence of varied techno-typological classes suggests that non-local cherts were not exclusively transported as finished tools, instead highlighting their role as versatile, transportable raw material volumes. Gravettian occupations exhibited greater reliance on non-local cherts, suggesting short-term occupations and higher mobility, while Proto-Solutrean and Solutrean occupations showed increased dependence on local materials, suggesting long-term occupations. These findings expand our understanding of UP technological adaptations in southwestern Iberia, emphasising the complex role of lithic resources in mobility, settlement, and social networks.
- The primates of gorongosa national park, MozambiquePublication . Carvalho, Susana; Anemone, Robert L.; de Oliveira Coelho, João; Bobe, RenéThis contribution is an introduction to and synthesis of the special issue of the AJBA on Primate Adaptations in a Highly Seasonal and Heterogeneous African Ecosystem. The eight research papers in this special issue provide the first compilation of primatological research to emerge from Gorongosa National Park and represent a major landmark in the development of primatology as a science in Mozambique. Primatological field studies in the park were initiated in 2016 under the umbrella of the Paleo-Primate Project Gorongosa with the aim of exploring the deep time evolutionary history of the Gorongosa ecosystem and establishing a long-term primatological field research program. This initiative has resulted in the training of a new generation of primatologists, including the first from Mozambique. The papers in this volume focus on the behavior, ecology, adaptations, and genomics of baboons and vervet monkeys, and set the stage for the study of other primates in Gorongosa, including samango monkeys and nocturnal strepsirrhines. The environmental characteristics of the Gorongosa ecosystem, with major rivers and lakes in a dynamic mosaic of forests, woodlands, wetlands, and grasslands, and rich biodiversity, make Gorongosa a suitable analog for the environments in which early hominins are thought to have evolved. This special issue is dedicated to the memory of our dear friend and colleague Dr. Marc Stalmans, who was the Director of Science of Gorongosa National Park from 2012 to 2025.
- Use-wear analysis shows changing handaxe grip and use across time at la noira (France)Publication . Rodriguez, Alice; Coco, Emily; Moncel, Marie-Hélène; Despriée, Jackie; Hardy, Bruce; Iovita, RaduHandaxes — sub-oval bifacially flaked stone tools — were produced for over a million years across Africa, Europe, and Asia during the Lower Palaeolithic. Their relatively uniform shape across varied environments and over a million years raises the question of whether or not their function and purposes were also uniform. Previous studies suggested that handaxe shape might be related to patterns in use and maintenance, but the level of analysis may have been too coarse to tease out specific uses. This study investigates the function of handaxes from two successive Acheulean occupations at the la Noira site (France), separated by ca. 200 ka. This research aimed to find out how hominins generally used handaxes through microscopic use wear analysis. Specifically, we documented macro-wear characteristics such as type (micro-scars, edge crushing, striations, edge rounding, polish), and their relative position and distribution. We used a Geographic Information System (GIS) to translate these observations into wear location heatmaps — visual representations highlighting areas of intense or repeated use — and compared these across different occupation periods. The analysis revealed that similar handaxes were likely held in different ways and used for different tasks during the two phases of occupation at la Noira, at 700 ka and respectively 450 ka. These findings suggest a more complex scenario of handaxe use than previously understood, including changes in tool use modalities over time that reflect changes in handaxe function and hominin technical behaviors.
- Classifying polish in use-wear analysis with convolutional neural networksPublication . Eleftheriadou, Anastasia; Djellal, Youssef; McPherron, Shannon; Marreiros, JoaoLithic use-wear analysis examines micro- and macroscopic traces on tool surfaces resulting from human use and post-depositional processes. Polish, formed through surface abrasion with different materials, is a key diagnostic feature that is increasingly analyzed using machine learning to enhance automation and standardization. However, further research is needed to explore whether deep learning approaches, in particular, can be effectively applied to use-wear analysis and to determine the optimal surface area size (e.g., patch size and microscope objectives) and model architecture (custom vs. pre-trained) for achieving the best results. This study employs convolutional neural networks (CNNs) to classify experimental polish based on contact material (wood, hide, bone) and use intensity, while also assessing optimal imaging and analytical parameters. The results of this exploratory study suggest that CNNs may effectively identify polish from bone and hide but perform less effectively with wood. The models also successfully distinguish between polish formed by short- and long-term use. Custom models outperformed pre-trained ones, particularly when using images that captured smaller areas of the tool’s surface, suggesting that bigger surface areas may lack the necessary information for optimal results. These findings underscore the need to expand use-wear datasets in terms of size and variability and optimize CNN architectures and workflows.
- New methods on the block: taxonomic identification of archaeological bones in resin-embedded sediments through paleoproteomicsPublication . Fagernäs, Zandra; Troché, Gaudry; Goldberg, Paul; Goldberg, Paul; Hublin, Jean-Jacques; McPherron, Shannon P; Murphree, William; Olsen, Jesper V; Sandgathe, Dennis; Sirakov, Nikolay; Soressi, Marie; Tsanova, Tsenka; Turq, Alain; Wierer, Michael; Welker, Frido; Aldeias, Vera; James O'ConnellThe integration of biomolecular studies of past organisms with geoarchaeological studies can significantly improve our understanding of the relative chronology and context of archaeologically (in)visible behaviors. However, the complexity and sedimentological heterogeneity of archaeological deposits at a microscopic scale is often not taken into consideration in biomolecular studies. Here, we investigate the preservation and retrieval of paleoproteomic data from bone fragments embedded in Pleistocene resin-impregnated sediment blocks. We show that resin impregnation has minimal effect on skeletal protein taxonomic identifications in modern skeletal material but observe an increase in oxidation of methionines. We then successfully retrieve proteins from resin-impregnated blocks from the Paleolithic sites of Bacho Kiro Cave, La Ferrassie, and Quinçay. The taxonomic identifications of minute bones encased in resin are in line with previous analyses of the faunal communities of these sites, with a diversity of taxa (Bos sp./Bison sp., Equus sp., Ursus sp., and Caprinae) observed at a microscale in Bacho Kiro. This differs from results from La Ferrassie where most of the samples are identified as a single taxon (Bos sp./Bison sp.) across different areas of the site. The block from Quinçay only provided taxonomic identification of two out of eleven bone-derived samples, likely due to diagenesis. Our work indicates that paleoproteomes can be retrieved from bone fragments at a microstratigraphic resolution, enabling the detailed study of faunal community composition at a scale that more closely matches that of past human occupations.
- The role of lithic technology in shaping mobility and decision-making: the case of Ararat-1 CavePublication . Cabrita Nora, David André; Frahm, Ellery; Oikonomou, Ioannis A.K.; Karampaglidis, Theodoros; Gasparyan, Boris; Petrosyan, Artur; Buller, Ariel MalinskyStudies of lithic technological organization have progressed from static typological classifications to analyses of dynamic processes of tool production, use, and discard. These analyses reveal the intricate interplay of human behavior and environmental adaptation. This paper investigates lithic technology, emphasizing the dichotomy of curated and expedient technologies by examining the differential strategies employed in raw material acquisition, tool production, and discard. It also explores how environmental, economic, and mobility factors interplay and shape lithic assemblages. Focusing on Ararat-1 cave, a late Middle Paleolithic site in the Armenian Highlands, we conducted an integrative techno-typological study of 1770 lithic artefacts spanning five stratigraphic units, identifying distinct raw material reduction strategies for obsidian and chert. Obsidian artefacts exhibited a focus on retouching and rejuvenation, indicative of curated technologies associated with high residential mobility, while the chert showed evidence of primary reduction and blank production, reflecting expedient strategies. By integrating module flake analysis and reviewing the Whole Assemblage Behavioral Indicators (WABI) framework, suggesting the addition of smaller debitage, we highlighted dual mobility patterns reflected in the site assemblage. This approach offers a refined understanding of lithic technological systems, providing insights into MIS 3 mobility and site function in the Armenian Highlands.
- The non-adult burials of cabeço da amoreira, muge (Portugal): recent discoveries and new insights into mesolithic funerary practicesPublication . Coutinho-Nogueira, Dany; Godinho, Ricardo Miguel; Gaspar, Rosa Ramos; Andre, Lino; Bicho, Nuno; Cascalheira, João; Gonçalves, Célia; Umbelino, CláudiaCabeço da Amoreira, a key Mesolithic shell mound in the Muge region (central Portugal) provides critical insights into the funerary and socio-cultural practices of Western Europe’s last hunter-gatherer-fisher populations. Recent systematic excavations have provided new data into biological diversity and funerary practices, particularly in relation to non-adult individuals. This study focuses on three non-adult burials uncovered since 2019. By employing state-of-the-art imaging techniques, we digitally recorded, virtually excavated, and analysed the biological profiles of these individuals. Our results demonstrate a notable variability in funerary practices, including differences in burial orientation, the presence or absence of artefacts, and even the construction of a purposeful burial feature for one individual. These discoveries contribute significantly to the growing body of research on Mesolithic funerary traditions, illustrating the complexity of social and ritual behaviours in southwestern Iberia’s last hunter-gatherer-fisher societies and opening new avenues for comparative research on childhood and burial practices in prehistory.
- Evolution of craniofacial shape in relation to sexual dimorphism in theropithecus and papioPublication . Ossorio, Ángeles; Figueroa-Torrejón, Ambra; Buston, Rodrigo; Caldon, Matteo; Mathe, Jacinto; Doria, Giuliano; Gippoliti, Spartaco; Volta, Antonella; Silva, María Joana Ferreira da; Bobe, René; Carvalho, Susana; Capelli, Cristian; Martínez, Felipe I.Introduction: Sexual dimorphism in cranial morphology is a significant aspect of primate evolution, providing insights into evolutionary pressures and mating systems in different species. This study focuses on cranial sexual dimorphism in Papio and Theropithecus, two closely related genera within the tribe Papionini.Methods: Using geometric morphometric techniques, we analyzed 570 cranial specimens from both genera, with data sourced from various studies and repositories. Thirty craniofacial landmarks were defined and analyzed through Geometric Morphometrics tools to evaluate shape variation.Results: Our findings reveal distinct morphological clusters for each genus and sex, with Papio and Theropithecus exhibiting significant sexual dimorphism. The results distinguish genera and sex-based groups, indicating differential impacts of size on shape across groups. The findings suggest that while sexual dimorphism is stable in magnitude within each genus, the specific morphological manifestations differ.Discussion: This research advances our understanding of the evolutionary mechanisms driving sexual dimorphism and emphasizes the need for further studies to explore the genetic and environmental factors influencing these differences. The innovative approach and comprehensive dataset provide a robust framework for future investigations into primate cranial morphology and its evolutionary implications.