ICR2-Artigos (em revistas ou actas indexadas)
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- Deciphering the diet of the iberian iynx: insights from taphonomic analysis of pleistocene coprolitesPublication . Rufà, Anna; Sanz, Montserrat; Daura, JoanPleistocene deposits often result from multiple and overlapping contributions. Carnivores play a significant role as bone accumulators in archaeological sites, but identifying the specific agent responsible for a particular accumulation can be challenging. Referential studies provide valuable insights into bone accumulation patterns, but they are based on modern collections and often fail to account for taphonomic biases associated with site formation processes. Here, we present, for the first time, a taphonomic study focused on fossilised Pleistocene Iberian lynx coprolites within the European context. The assemblage, dated to ca. 33 ky B.P., was recovered from layer III of Cova del Gegant, a site identified as a lynx den likely used for rearing cubs. This study is based on previous research at the site and analyses bone remains consumed by the Iberian lynx (Lynx pardinus), recovered from coprolites, to investigate their role in archaeological contexts. The findings are consistent with other lynx accumulations documented in literature, particularly regarding leporid remains. The anatomical proportions in this assemblage are more balanced than other types of accumulations, with a higher representation of cranial elements. Digestive damage is predominant, affecting most bones, especially at moderate and strong degrees. These results enhance our understanding of archaeological accumulation processes and highlight the role of lynxes as bone accumulators. The archaeological evidence from the site indicates that the Iberian lynx inhabited environments and climates that differ significantly from those currently observed. However, the present study suggests that its diet remained relatively consistent with that of contemporary Iberian populations.
- Early evidence of earthquake management through mobility and social network adjustments at Vale Boi (SW Iberia)Publication . Barbieri, Alvise; Sánchez-Martínez, Javier; Belmiro, Joana; Fernandes, Paulo; Galfi, Jovan; Horta, Pedro; Cascalheira, João; Bicho, NunoTectonic processes profoundly influenced the dispersal, evolution, and archaeological record of our Paleolithic ancestors. However, in-depth reconstructions of human resilience against seismic events come mostly from contexts dating to the last 13,000 years. Here, we present geophysical, geological, geochronological, and archaeological data from the openair site of Vale Boy in southwestern Iberia, revealing how foragers mitigated earthquake impacts between ~30,000 and 24,000 years ago. At Vale Boi, faulting formed sedimentary traps that were recurrently exploited by hunter-gatherers and periodically buried by rockfalls, likely triggered by ≥5.7 Mw earthquakes. Despite seismic destruction, hunter-gatherers repeatedly returned to the site, drawn by its strategic access to key resources. They mitigated seismic risks by increasing their mobility and even abandoning Vale Boi, as seen during the Gravettian and at the early/late Proto-Solutrean transition. When seismic and climatic stressors co-occurred (Heinrich Event 2), they did not abandon the site. Instead, they adopted strategies to limit their exposure to rockfall hazard while securing access to increasingly vital coastal and estuarine resources. Until the early Proto-Solutrean, tightly knit social networks supported the survival of Vale Boi foragers during periods of high stress, such as the aftermath of seismic rockfalls. During the late Proto-Solutrean, an expansion of super-regional connections might have functioned as a proactive buffer against future tectonic shocks. Our findings demonstrate that forager resilience to seismic events relied on flexible adjustments in mobility and social connectivity. Despite limitations deriving from its single-site focus, this study underscores the value of deep archaeological sequences for disentangling human responses to intertwined geological and ecological pressures.
- Homo erectus adapted to steppe-desert climate extremes one million years agoPublication . Mercader, Julio; Akuku, Pamela; Boivin, Nicole; Camacho, Alfredo; Carter, Tristan; Clarke, Siobhán; Temprana, Arturo Cueva; Favreau, Julien; Galloway, Jennifer; Hernando, Raquel; Huang, Haiping; Hubbard, Stephen; Kaplan, Jed O.; Larter, Steve; Magohe, Stephen; Mohamed, Abdallah; Mwambwiga, Aloyce; Oladele, Ayoola; Petraglia, Michael; Roberts, Patrick; Saladié, Palmira; Shikoni, Abel; Silva, Renzo; Soto, María; Stricklin, Dominica; Mekonnen, Degsew; Zhao, Wenran; Durkin, PaulQuestions about when early members of the genus Homo adapted to extreme environments like deserts and rainforests have traditionally focused on Homo sapiens. Here, we present multidisciplinary evidence from Engaji Nanyori in Tanzania’s Oldupai Gorge, revealing that Homo erectus thrived in hyperarid landscapes one million years ago. Using biogeochemical analyses, precise chronometric dating, palaeoclimate simulations, biome modeling, fire history reconstructions, palaeobotanical studies, faunal assemblages, and archeological evidence, we reconstruct an environment dominated by semidesert shrubland. Despite these challenges, Homo erectus repeatedly occupied fluvial landscapes, leveraging water sources and ecological focal points to mitigate risk. These findings suggest archaic humans possessed an ecological flexibility previously attributed only to later hominins. This adaptability likely facilitated the expansion of Homo erectus into the arid regions of Africa and Eurasia, redefining their role as ecological generalists thriving in some of the most challenging landscapes of the Middle Pleistocene.
- Short communication: etimating radiocarbon reservoir effects in bolivian amazon freshwater lakesPublication . García-Escárzaga, Asier; Lombardo, Umberto; Bello-Alonso, Patricia M.; Capriles, José M.; Colonese, André; Dudgeon, Kate; Lucas Antunes Simões, Carlos Duarte; Fernandes, RicardoThe Llanos de Moxos, in the Bolivian Amazon, preserves a remarkable archaeological record, featuring thousands of forest islands. These anthropogenic sites emerged as a result of activities of the earliest inhabitants of Amazonia during the Early and Middle Holocene. Excavations conducted to date on the forest islands have revealed that many assemblages contain a high number of ancient freshwater snail remains. In these shell middens, the most represented mollusc taxon, and in most cases the sole one, is Pomacea spp., a genus that inhabits inland shallow lakes and wetlands. Although human burials and faunal remains are typically recovered from these sites, their collagen is often not preserved or is of poor quality, and shell carbonates from Pomacea shells, along with carbonised plant remains, are often used for 14C measurements. However, it remains undetermined if these measurements are subject to radiocarbon reservoir effect (RRE). To determine if a freshwater RRE could affect the age estimations of Amazonian archaeological and other paleoecological deposits, we collected modern coeval Pomacea shells and tree leaves from four locations across the Llanos de Moxos area for AMS radiocarbon dating. The radiocarbon results combined with the environmental history of Llanos de Moxos during the Holocene, do not reveal any significant RREs, and support the continued use of freshwater molluscs as viable material for radiocarbon dating in the region.
- Renewed impetus for stone age research in the eastern free state (South Africa) centred on Rose Cottage CavePublication . Schmid, Viola C.; Wadley, Lyn; Brandl, Michael; Guillemard, Iris; Rhodes, Sara; Taipale, Noora; Witelson, David M.; Börner, Mario; Rots, Veerle; Cnuts, Dries; Hodgskiss, Tammy; Murungi, May; Nigst, Philip R.; Porraz, Guillaume; Puech, Elysandre; Stahlschmid, Mareike C.; Stelzer, Stefanie; Teyssandier, Nicolas; Tribolo, Chantal; Val, Aurore; Van Schalkwyk, Len; Archer, WillRose Cottage Cave is widely recognised as a key sequence for the Middle Stone Age and Later Stone Age in the southern African central interior, with its unique palaeoenvironmental and chronocultural archive spanning a semi-continuous record from the Late Pleistocene to the 19th century. Building on important previous research, new excavations will extend our knowledge concerning technological systems, landscape use, human-environment interactions, as well as site formation and the linkages between these parameters in a regional context. Here we report on preliminary insights from the recent fieldwork and provide an overview of future directions.
- Modern African ecosystems as landscape-scale analogues for reconstructing woody cover and early hominin environmentsPublication . Negash, Enquye W.; Alemseged, Zeresenay; Barr, W. Andrew; Behrensmeyer, Anna K.; Blumenthal, Scott A.; Bobe, René; Carvalho, Susana; Cerling, Thure E.; Chritz, Kendra L.; McGuire, Elizabeth; Uno, Kevin T.; Wood, Bernard; Wynn, Jonathan G.Reconstructing habitat types available to hominins and inferring how the paleo-landscape changed through time are critical steps in testing hypotheses about the selective pressures that drove the emergence of bipedalism, tool use, a change in diet, and progressive encephalization. Change in the amount and distribution of woody vegetation has been suggested as one of the important factors that shaped early hominin evolution. Previous models for reconstructing woody cover at eastern African hominin fossil sites used global-scale modern soil comparative datasets. Our higher-spatial-resolution study of carbon isotopes in soil organic matter is based on 26 modern African locations, ranging from tropical grass-dominated savannas to forests. We used this dataset to generate a new Eastern Africa especific Woody Cover Model (EAWCM), which indicates that eastern African hominin sites were up to 13% more wooded than reconstructions based on previous models. Reconstructions using the EAWCM indicate widespread woodlands/bushlands and wooded grasslands and a shift toward C4-dominated landscapes in eastern Africa over the last 6 million years.
- Tool skill impacts the archaeological evidence across technological primatesPublication . Luncz, Lydia V.; Slania, Nora E.; Almeida-Warren, Katarina; Carvalho, Susana; Falótico, Tiago; Malaivijitnond, Suchinda; Arroyo, Adrián; Torre, Ignacio de la; Proffitt, TomosThe archaeological record offers insights into our evolutionary past by revealing ancient behaviour through stone and fossil remains. Percussive foraging is suggested to be particularly relevant for the emergence of tool-use in our lineage, yet early hominin percussive behaviours remain largely understudied compared to flaked technology. Stone tool-use of extant primates allows the simultaneous investigation of their artefacts and the associated behaviours. This is important for understanding the development of tool surface modification, and crucial for interpreting damage patterns in the archaeological record. Here, we compare the behaviour and the resulting material record across stone tool-using primates. We investigate the relationship of nut-cracking technique and stone tool modification across chimpanzees, capuchins, and long-tailed macaques by conducting standardized field experiments with comparable raw materials. We show that different techniques likely emerged in response to diverse nut hardness, leading to variation in foraging success across species. Our experiments further demonstrate a correlation between techniques and the intensity of visible percussive damage on the tools. Tools used with more precision and efficiency as demonstrated by macaques, show fewer use wear traces. This suggests that some percussive techniques may be less readily identified in the archaeological record.
- A holocene n-alkane stable isotope record from Wonderwerk Cave, South Africa and its implications for the later stone age recordPublication . Ecker, Michaela; Rhodes, Sara; Andersen, Nils; Horwitz, Liora Kolska; Chazan, Michael; Makarewicz, Cheryl A.Sediment biomarkers are important archives of regional, and global climate signatures, particularly in regions which lack continuous terrestrial archives such as the semi-arid deserts of Africa. We measured carbon and hydrogen stable isotopes from plant wax n-alkanes recovered from the Holocene Later Stone Age (LSA) sedimentary sequence at Wonderwerk Cave (South Africa), that comprises several technocomplexes (Kuruman/Oakhurst, Wilton, Ceramic Wilton and Historic). The plant wax n-alkane results were integrated with published palaeoenvironment reconstructions from the cave based on faunal, botanical, geological and sedimentological proxies which provides a robust comparative framework. The findings match well with other proxy records from the same strata and indicate a semiarid to semi-humid early Holocene, with a mix of woody C3 plants and C4 grasses. In contrast, the midlate Holocene environment was increasingly arid, open and dominated by C4 grasses. A distinct humid period at 5300–6200 cal. BP is evident, associated with a high density of archaeological material and a change in cultural expression in the Wonderwerk record. This study provides a step forward in using stable isotopes from biomarkers to create terrestrial environmental records in semi-arid regions.
- Las ocupaciones tardiglaciares de la Cova de Les Borres (La Febró, Tarragona)Publication . Ramón Rabuñal, José; Soto, María; Ignacio Morales, Juan; Lombao, Diego; Soares Remiseiro, Miguel; Fernández-Marchena, Juan Luis; Vallverdú, JosepEn este artículo se presentan los trabajos arqueológicos desarrollados entre 2012 y 2015 en la Cova de Les Borres (La Febró, Tarragona). Los nuevos datos cronoestratigráficos y los materiales arqueológicos analizados derivan de los tres niveles principales identificados hasta el momento, que datan de mediados del GI-1 (Nivel 2), finales del GI-1/inicios del GS-1 (Nivel 1.2) y presumiblemente del GS-1 (Nivel 1.1). La secuencia documentada resulta de gran relevancia para el estudio de las dinámicas de evolución tecnológica y cultural durante el final del Pleistoceno en el NE peninsular, al ser uno de los escasos yacimientos conocidos con ocupaciones sucesivas durante el GI-1 y el GS-1, asociadas al Magdaleniense Superior Final y al Sauveterroide.
- Modern stone tool users from northern Kenya emphasize mass and edge length in the selection of cutting toolsPublication . Reeves, Jonathan S.; Douglass, Matthew J.; Haney, Christine E.; Ndiema, Emmanuel K.; Luncz, Lydia V.The production and use of informal flake cutting tools played an essential role in foraging across human history. While much is known about the production of these tools, the attributes that facilitate their selection and use remain underexplored. This is because there remain few opportunities for the use of such tools in a traditional setting. The Daasanach of East Turkana, Kenya, maintain a tradition of stone tool production and use, affording the opportunity to investigate tool selection in a natural setting. Through interview and video documentation, we observed eight expert toolmakers complete butchery tasks, allowing us to link traditional technological knowledge governing cutting tool selection with measurable lithic attributes. Our findings reveal that factors such as edge angle, mass and grip significantly influence tool selection and cutting efficiency. These insights provide new perspectives on the functional relevance of informal cutting tools that are largely understood through experimentation. The outcomes of this study provide a venue for interpreting lithic variability in ancient contexts from the perspectives of traditional expert tool users. This research underscores the utility of detailed ethnographic studies to complement archaeological findings, enhancing our understanding of early human technological evolution.