Robert C Power
University College Dublin, School of Archaeology, Department Member
- Geoarchaeology, Ceramic Analysis (Archaeology), Mesolithic Archaeology, Middle to Upper Paleolithic Transition, Origins of Agriculture, Phytolith Analysis, and 36 moreStarch analysis (Archaeology), Plant foods in hominin dietary ecology, Experimental Archaeology, Archaeobotany, Paleodiet, Phytoliths, Indigenous Agricultural Systems, Dental Calculus, Starch, Neolithic Ireland, Natufian, Archaeology, Material Culture Studies, Near Eastern Archaeology, Ancient Near East, Environmental Archaeology, Levantine Archaeology, Neanderthals (Palaeolithic Archaeology), Iberian Prehistory (Archaeology), Residue Analysis (Archaeology), Archeobotany, Subsistance Strategies (Archaeology), Neanderthal subsistence, Natufian culture in the Levant, Hunter-gatherer archaeobotany, Ancient Mediterranean Dietary Practice, History, Prehistoric Archaeology, Human Evolution, Archaeological Science, Stable Isotopes, Archaeological Chemistry, Climate modeling, Human diet, Anthropology, and Mesolithic Irelandedit
- I am a researcher at Ludwig-Maximilians-University Munich. My work is dedicated to exploring the role of diet in huma... moreI am a researcher at Ludwig-Maximilians-University Munich. My work is dedicated to exploring the role of diet in human origins. Much of my work uses plant microremains (e.g. phytoliths) to understand plant consumption in hunter gatherer and early farming societies.edit
Purpose: Dental calculus forms on teeth during the life of an individual and its investigation can yield information about diet, health status, and environmental pollution. Currently, the analytical techniques used to visualize the... more
Purpose: Dental calculus forms on teeth during the life of an individual and its investigation can yield information about diet, health status, and environmental pollution. Currently, the analytical techniques used to visualize the internal structure of human dental calculus and entrapped inclusions are limited and require destructive sampling, which cannot always be justified. Approach: We used propagation phase-contrast synchrotron radiation micro-computed tomography (PPC-SR-μCT) to non-destructively examine the internal organization of dental calculus, including its microstructure and entrapped inclusions, on both modern and archeological samples. Results: The virtual histological exploration of the samples shows that PPC-SR-μCT is a powerful approach to visualize the internal organization of dental calculus. We identified several important features, including previously undetected negative imprints of enamel and dentine growth markers (perikymata and periradicular bands, respectively), the non-contiguous structure of calculus layers with multiple voids, and entrapped plant remains. Conclusions: PPC-SR-μCT is an effective technique to explore dental calculus structural organization, and is especially powerful for enabling the identification of inclusions. The non-destructive nature of synchrotron tomography helps protect samples for future research. However, the irregular layers and frequent voids reveal a high heterogeneity and variability within calculus, with implications for research focusing on inclusions.
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In recent years, new applications of microremain dietary analysis using dental calculus as a source of dietary data on ancient human subsistence and behaviours have accelerated. The dental calculus of contemporary human and non-human... more
In recent years, new applications of microremain dietary analysis using dental calculus as a source of dietary data on ancient human subsistence and behaviours have accelerated. The dental calculus of contemporary human and non-human populations with known diets have been used as reference datasets, including the chimpanzees of Taï National Park (Côte d'Ivoire), but explaining the preservation mechanism involved is challenged by our incomplete knowledge of the microremain content within the diets of these reference populations and our rudimentary information on microremain incorporation into dental calculus. Here, we analyse phytoliths in faecal samples to assess to what extent plant phytoliths of a diet are reflected in the dental calculus as well as in the egested faeces. In this study, we identify and document the faecal phytolith assemblages as an indicator of plant consumption in two Western chimpanzees of the Taï National Park (Côte d'Ivoire) before (wet season), during (dry season) and after (dry season) a dust-rich period. Moreover, observational dietary records of these two individuals were compiled to improve the interpretability of this dental calculus phytolith dataset. The faecal phytolith assemblages vary significantly across samples in terms of abundance and diversity. The most common phytolith morphotypes were eudicot plates, single-cell and multi-cell tracheids, monocot rugulose and echinate spheroids and, to a lesser extent, unspecified thick and thin elongates. High loads of grit and other micro-remains (e.g. diatoms) are found during the dry period. Using observational dietary records as a starting point and our faecal results as a terminus, we consider how dental calculus can accumulate phytoliths. Our findings enable identification of the phytolith morphotypes that are under-represented in dental calculus, which is highly informative for future dental calculus research strategies.
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Neanderthals are known primarily from their habitation of Western Eurasia, but they also populated large expanses of Northern Asia for thousands of years. Owing to a sparse archaeological record, relatively little is known about these... more
Neanderthals are known primarily from their habitation of Western Eurasia, but they also populated large expanses of Northern Asia for thousands of years. Owing to a sparse archaeological record, relatively little is known about these eastern Neanderthal populations. Unlike in their western range, there are limited zooarchaeological and paleobotanical studies that inform us about the nature of their subsistence. Here, we perform a combined analysis of carbon and nitrogen stable isotopes on bone collagen and microbotanical remains in dental calculus to reconstruct the diet of eastern Neanderthals at Chagyrskaya Cave in the Altai Mountains of Southern Siberia, Russia. Stable isotopes identify one individual as possessing a high trophic level due to the hunting of large-and medium-sized ungulates, while the analysis of dental calculus also indicates the presence of plants in the diet of this individual and others from the site. These findings indicate eastern Neanderthals may have had broadly similar subsistence patterns to those elsewhere in their range.
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Three piles of shoots, leaves, and pods were discovered in the Zagunluk cemetery (about AD 100-400 based on 14C dating), Xinjiang, NW China. Morphological characteristics assigned the specimens to Medicago sativa L. (alfalfa). The... more
Three piles of shoots, leaves, and pods were discovered in the Zagunluk cemetery (about AD 100-400 based on 14C dating), Xinjiang, NW China. Morphological characteristics assigned the specimens to Medicago sativa L. (alfalfa). The preserved condition of alfalfa remains unambiguously indicate that the plant was of great economic importance and used as hay fodder at that time. This study provides the first systematic archeobotanical data about the forage utilization of alfalfa and the earliest relevant physical material so far known in China. Our results also help us to understand the dispersal of alfalfa across the Eurasia via the southern Xinjiang region and the cultural exchange information between China and the West.
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Occupation of the humid tropics by Late Holocene food producers depended on the use of vegetative agricultural systems. A small number of vegetative crops from the Americas and Asia have come to dominate tropical agriculture globally in... more
Occupation of the humid tropics by Late Holocene food producers depended on the use of vegetative agricultural systems. A small number of vegetative crops from the Americas and Asia have come to dominate tropical agriculture globally in these warm and humid environments, due to their ability to provide reliable food output with low labour inputs, as well as their suitability to these environments. The prehistoric arrival in Africa of Southeast Asian crops, in particular banana, taro and greater yam but also sugar cane and others, is commonly regarded as one of the most important examples of transcontinental exchanges in the tropics. Although chronologies of food-producer expansions in Central Africa are increasingly gaining resolution, we have very little evidence for the agricultural systems used in this region. Researchers have recovered just a handful of examples of archaeobotanical banana, taro and sugar cane remains, and so far none from greater yam. Many of the suggested dispersal routes have not been tested with chronological, ecological and linguistic evidence of food producers. While the impact of Bantu-speaking people has been emphasised, the role of non-Bantu farmers speaking Ubangi and Central Sudanic languages who have expanded from the (north)east has hardly been considered. This article will review the current hypotheses on dispersal routes and suggest that transmissions via Northeast Africa should become a new focus of research on the origins of Asian vegeculture crops in Africa.
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Archaeologists have suggested that subsistence is central to understanding the population trajectory of Middle Paleolithic Neanderthals and Upper Paleolithic modern humans in western Eurasia. Zooarchaeology and stable isotope data have... more
Archaeologists have suggested that subsistence is central to understanding the population trajectory of Middle Paleolithic Neanderthals and Upper Paleolithic modern humans in western Eurasia. Zooarchaeology and stable isotope data have revealed that hunting supplied most of the protein requirements for Middle Paleolithic Neanderthals and early Upper Paleolithic modern humans. However, the application of dental wear, archaeobotany, and other techniques have shown that plants were an important part of the diet in both Middle and Upper Paleolithic societies in warm and cool regions of western Eurasia. Some lines of evidence have indicated that both groups potentially used a relatively similar range of plants even though this contradicts expectations from optimal foraging theory and diet breadth models positing that Middle Paleolithic societies used fewer plant foods. In this contribution, we identify evidence for increases in the use of Upper Paleolithic processing of plant foods in western Eurasia. We propose that increases in human population density throughout the Upper Paleolithic and especially during the late glacial period were supported by the more frequent use of plant food processing technologies, rather than the use of new plant food taxa.
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Since the birth of archaeology, ceramics have maintained a dominant yet arguably underutilised role in archaeology. Trends in the discipline have largely fixated on pottery as a proxy to examine material culture change. This is despite... more
Since the birth of archaeology, ceramics have maintained a dominant yet arguably underutilised role in archaeology. Trends in the discipline have largely fixated on pottery as a proxy to examine material culture change. This is despite the plethora of data which now may be extracted from ceramic vessels following the expansion of archaeological science. Due to archaeological theoretical developments and the increasing diversity from new artefact finds the role of potteries in interpretation has being shrouded in ambiguity. In this framework engagement of questions of core territory area, diet and subsistence patterns offer the best opportunity for elucidating past cultures. Indeed this research approach is encouraged by the advance of innovations in archaeological science such as residue analysis and vessel fabric analysis.
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Dental calculus is increasingly recognized as a major reservoir of dietary information. Palaeodietary studies using plant and animal micro remains (e.g. phytoliths, pollen, sponge spicules, and starch grains) trapped in calculus have the... more
Dental calculus is increasingly recognized as a major reservoir of dietary information. Palaeodietary studies using plant and animal micro remains (e.g. phytoliths, pollen, sponge spicules, and starch grains) trapped in calculus have the potential to revise our knowledge of the dietary role of plants in past populations. The conventional methods used to isolate and identify these micro remains rely on removing them from their microenvironment in the calculus, thus the microenvironment that traps and preserves micro remains is not understood.
By using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEMeEDX) on modern chimpanzee calculus from the Taï Forest, Côte d’Ivoire, and human calculus from the Chalcolithic site of Camino del Molino, Spain, we present the first reported observations on characteristics of the matrix setting that are conducive to the survival of starch in dental calculus. We also assess the potential for SEM-EDX to detect starch and differentiate it from structurally and molecularly similar substrates. We demonstrate that SEM-EDX may offer a non destructive technique for studying micro remains in certain contexts. Finally, we compare traditional optical analytical techniques (OM) with less invasive electron microscopy. The results indicate that SEM-EDX and OM are both effective for observing micro remains in calculus, but differ in their analytical resolution to identify different micro remains, and we therefore recommend a sequential use of both techniques.
By using scanning electron microscopy and energy dispersive X-ray spectroscopy (SEMeEDX) on modern chimpanzee calculus from the Taï Forest, Côte d’Ivoire, and human calculus from the Chalcolithic site of Camino del Molino, Spain, we present the first reported observations on characteristics of the matrix setting that are conducive to the survival of starch in dental calculus. We also assess the potential for SEM-EDX to detect starch and differentiate it from structurally and molecularly similar substrates. We demonstrate that SEM-EDX may offer a non destructive technique for studying micro remains in certain contexts. Finally, we compare traditional optical analytical techniques (OM) with less invasive electron microscopy. The results indicate that SEM-EDX and OM are both effective for observing micro remains in calculus, but differ in their analytical resolution to identify different micro remains, and we therefore recommend a sequential use of both techniques.
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The Natufian culture was a critical junction in human subsistence, marking the first steps towards sedentism and the domestication of cereals and pulses. The Natufians are known to have collected large seeded grasses (wild barley and... more
The Natufian culture was a critical junction in human subsistence, marking the first steps towards sedentism and the domestication of cereals and pulses. The Natufians are known to have collected large seeded grasses (wild barley and wheat) and small-seeded grasses prior to the onset of cultivation but in most of the Levant little direct evidence of this survives. A variety of stone mortars and mortars carved into bedrock are common on Natufian sites. These were often interpreted as reflecting intensification of cereal or acorn food preparation, though the proposition was rarely tested. This study uses phytoliths to interpret Late Natufian plant-use at Raqefet Cave in southeastern Mount Carmel, Israel. Phytolith analysis focused on 35 samples from bedrock mortars, human burials, and cave floor sediments in the cave. We show that the Late Natufians at Raqefet were consuming both small-grained grasses and wheat and barleys. Our findings also suggest that the mortars did not serve primarily as specialised grass-seed processing implements. There is also evidence the occupants of Raqefet Cave continued to utilise forest resources, even as Late Natufians shifted towards more exploitation of wild grasses elsewhere in the southern Levant.
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Neanderthals are a Late Pleistocene hominin adapted to cool high-latitudes environments. Popular views on how Neanderthals adapted to these environments have changed over time. While once thought of as a largely scavenging hominin,... more
Neanderthals are a Late Pleistocene hominin adapted to cool high-latitudes environments. Popular views on how Neanderthals adapted to these environments have changed over time. While once thought of as a largely scavenging hominin, Neanderthals are now accepted to be competent hunters who sourced a major part of their nutrition from ungulates. Neanderthal diet appears to be highly terrestrial but there are difficulties ruling out a contribution of marine foods in many regions. While the important role of large and medium ungulates in debates about Neanderthal diet has largely been settled, recent discussions about Neanderthal diet have explored the extent of their diet varied, the role of minor foods (plant, small mammal and marine foods) and dietary flexibility.
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Although in popular imagination oceans are often seen as barriers, in archaeology oceans tend to be understood as connectors of different human societies. For thousands of years, oceans were highways of trade, migration and diffusion that... more
Although in popular imagination oceans are often seen as barriers, in archaeology oceans tend to be understood as connectors of different human societies. For thousands of years, oceans were highways of trade, migration and diffusion that facilitated some of the most important cultural transitions in human history. One of the most tangible traces of these ancient connections is the foods people eat and the languages they speak. Botanical research shows many crops that are hugely important in Africa derive from wild progenitors that must have been domesticated in Asia, while many Asian staples must have domesticated initially in Africa. Some of these crops dispersal broadly followed population movements, which are potentially contemporaneous but many poorly understood examples clearly do not. This talk will highlight how new scientific methods of analysis are allowing researchers to question how and when these interactions occurred. Growing evidence suggests that very different types of societies (forager-farmer-pastoralist) interacted more than once believed and transoceanic movements were more complex than previously thought.
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Reconstructing hominin diets is hindered by biases in the methods used to recover dietary information, and by our narrow interpretations of modern forager behavior. A better understanding of these limitations necessitates re-examination... more
Reconstructing hominin diets is hindered by biases in the methods used to recover dietary information, and by our narrow interpretations of modern forager behavior. A better understanding of these limitations necessitates re-examination of dietary evidence in the archaeological record. Zooarchaeological and stable isotope data suggest that medium and large game dominated the diets of Middle and Upper Paleolithic foragers, and environmental reconstructions indicate that energetic returns from large game far exceeded returns from plants and smaller animals. Yet our studies of
dental calculus from several Paleolithic populations demonstrate consumption of starchy plant foods.
Furthermore, our data on plant food consumption among Hadza foragers of Tanzania and Twe foragers-horticulturalists of Namibia demonstrate that 1) caloric and biological value (digestibility) of plant foods are not always predictive of foraging strategy, and 2) microfossils in dental calculus present an incomplete record of plant consumption. These results indicate that we continue to underestimate the importance and presence of plants in ancient diets. We suggest that calories must have come from both plant and animal origin in Paleolithic Eurasia, not only to enable macronutrient balance, but also to ensure acquisition of essential micronutrients in the diet despite the lower energetic returns of plant food resources
dental calculus from several Paleolithic populations demonstrate consumption of starchy plant foods.
Furthermore, our data on plant food consumption among Hadza foragers of Tanzania and Twe foragers-horticulturalists of Namibia demonstrate that 1) caloric and biological value (digestibility) of plant foods are not always predictive of foraging strategy, and 2) microfossils in dental calculus present an incomplete record of plant consumption. These results indicate that we continue to underestimate the importance and presence of plants in ancient diets. We suggest that calories must have come from both plant and animal origin in Paleolithic Eurasia, not only to enable macronutrient balance, but also to ensure acquisition of essential micronutrients in the diet despite the lower energetic returns of plant food resources
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The disappearance of the Neanderthal populations of Western Eurasia following the arrival of Modern Humans is poorly understood. Some models suggest that the Neanderthal’s narrower diet may have been a competitive disadvantage that was a... more
The disappearance of the Neanderthal populations of Western Eurasia following the arrival of Modern Humans is poorly understood. Some models suggest that the Neanderthal’s narrower diet may have been a competitive disadvantage that was a factor in their demise. Until recently there is limited data available on Neanderthal dietary breadth, particularly about plant foods.
The Neanderthals from southern Europe are less widely-understood than their more northern counterparts, though there is evidence that they persisted late in this area and likely had access to a wider spectrum of dietary resources. However, the vegetal component of diet in Palaeolithic Western Mediterranean is almost entirely unknown.
We analysed the plant microremains (phytoliths and starch grains) preserved in dental calculus and on stone tools in order to assess the vegetal component of the diet at Sima de las Palomas in southeastern Iberia. Our results provide the first direct evidence of plant consumption within a range of niches in Middle Palaeolithic Western Mediterranean, which may influence our understanding of the behavioural variation among Neanderthal groups.
The Neanderthals from southern Europe are less widely-understood than their more northern counterparts, though there is evidence that they persisted late in this area and likely had access to a wider spectrum of dietary resources. However, the vegetal component of diet in Palaeolithic Western Mediterranean is almost entirely unknown.
We analysed the plant microremains (phytoliths and starch grains) preserved in dental calculus and on stone tools in order to assess the vegetal component of the diet at Sima de las Palomas in southeastern Iberia. Our results provide the first direct evidence of plant consumption within a range of niches in Middle Palaeolithic Western Mediterranean, which may influence our understanding of the behavioural variation among Neanderthal groups.
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This paper presents the earliest evidence for the exploitation of lignite (brown coal) in Europe and sheds new light on the use of combustion fuel sources in the 2nd millennium BCE Eastern Mediterranean. We applied Thermal... more
This paper presents the earliest evidence for the exploitation of lignite (brown coal) in Europe and sheds new light on the use of combustion fuel sources in the 2nd millennium BCE Eastern Mediterranean. We applied Thermal Desorption/Pyrolysis–Gas Chromatography-Mass Spectrometry and Polarizing Microscopy to the dental calculus of 67 individuals and we identified clear evidence for combustion markers embedded within this calculus. In contrast to the scant evidence for combustion markers within the calculus samples from Egypt, all other individuals show the inhalation of smoke from fires burning wood identified as Pinaceae, in addition to hardwood, such as oak and olive, and/or dung. Importantly, individuals from the Palatial Period at the Mycenaean citadel of Tiryns and the Cretan harbour site of Chania also show the inhalation of fire-smoke from lignite, consistent with the chemical signature of sources in the northwestern Peloponnese and Western Crete respectively. This first evid...