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Evolutionary Anthropology Issues News and Reviews

Impact factor: 3.528 5-Year impact factor: 4.643 Print ISSN: 1060-1538 Online ISSN: 1520-6505 Publisher: Wiley Blackwell (John Wiley & Sons)

Subject: Anthropology

Most recent papers:

  • Demic and cultural diffusion in prehistoric Europe in the age of ancient genomes.
    Eugene E. Harris.
    Evolutionary Anthropology Issues News and Reviews. October 13, 2017
    Ancient genomes can help us detect prehistoric migrations, population contractions, and admixture among populations. Knowing the dynamics of demography is invaluable for understanding culture change in prehistory, particularly the roles played by demic and cultural diffusion in transformations of material cultures. Prehistoric Europe is a region where ancient genome analyses can help illuminate the interplay between demography and culture change. In Europe, there is more archeological evidence, in terms of detailed studies, radiometric dates, and explanatory hypotheses that can be evaluated, than in any other region of the world. Here I show some important ways that ancient genomes have given us insights into population movements in European prehistory. I also propose that studies might be increasingly focused on specific questions of culture change, for example in evaluating the makers of “transitional” industries as well as the origins of the Gravettian and spread of the Magdalenian. I also discuss genomic evidence supporting the large role that demic expansion has played in the Neolithization of Europe and the formation of the European population during the Bronze Age.
    October 13, 2017   doi: 10.1002/evan.21545   open full text
  • When does it pay to invest in a patch? The evolution of intentional niche construction.
    Kathryn A. Mohlenhoff, Brian F. Codding.
    Evolutionary Anthropology Issues News and Reviews. October 13, 2017
    Humans modify their environments in ways that significantly transform the earth's ecosystems. Recent research suggests that such niche‐constructing behaviors are not passive human responses to environmental variation, but instead should be seen as active and intentional management of the environment. Although such research is useful in highlighting the interactive dynamics between humans and their natural world, the niche‐construction framework, as currently applied, fails to explain why people would decide to modify their environments in the first place. To help resolve this problem, we use a model of technological intensification to analyze the cost‐benefit trade‐offs associated with niche construction as a form of patch investment. We use this model to assess the costs and benefits of three paradigmatic cases of intentional niche construction in Western North America: the application of fire in acorn groves, the manufacture of fishing weirs, and the adoption of maize agriculture. Intensification models predict that investing in patch modification (niche construction) only provides a net benefit when the amount of resources needed crosses a critical threshold that makes the initial investment worthwhile. From this, it follows that low‐cost investments, such as burning in oak groves, should be quite common, while more costly investments, such as maize agriculture, should be less common and depend on the alternatives available in the local environment. We examine how patterns of mobility, risk management, territoriality, and private property also co‐evolve with the costs and benefits of niche construction. This approach illustrates that explaining niche‐constructing behavior requires understanding the economic trade‐offs involved in patch investment. Integrating concepts from niche construction and technological intensification models within a behavioral ecological framework provides insights into the coevolution and active feedback between adaptive behaviors and environmental change across human history.
    October 13, 2017   doi: 10.1002/evan.21534   open full text
  • Sex‐biased dispersal of human ancestors.
    Yukimaru Sugiyama.
    Evolutionary Anthropology Issues News and Reviews. August 16, 2017
    Some anthropologists and primatologists have argued that, judging by extant chimpanzees and humans, which are female‐biased dispersers, the common ancestors of humans and chimpanzees were also female‐biased dispersers. It has been thought that sex‐biased dispersal patterns have been genetically transmitted for millions of years. However, this character has changed many times with changes in environment and life‐form during human evolution and historical times. I examined life‐form and social organization of nonhuman primates, among them gatherers (foragers), hunter‐gatherers, agriculturalists, industrialists, and modern and extant humans. I conclude that dispersal patterns changed in response to environmental conditions during primate and human evolution.
    August 16, 2017   doi: 10.1002/evan.21539   open full text
  • Twentieth anniversary of Homo antecessor (1997‐2017): a review.
    José María Bermúdez de Castro, María Martinón‐Torres, Juan Luis Arsuaga, Eudald Carbonell.
    Evolutionary Anthropology Issues News and Reviews. August 16, 2017
    It has been twenty years since diagnosis and publication of the species Homo antecessor.1 Since then, new human fossils recovered from the TD6 level of the Gran Dolina site (Sierra de Atapuerca, northern Spain) have helped to refine its taxonomic and phylogenetic position. In this paper, we present a synthesis of the most characteristic features of this species, as well as our interpretation derived from the latest investigations. We focus on the phylogenetic interpretation of Homo antecessor, taking into account the most recent paleogenetic analyses and a reassessment of the European Middle Pleistocene hominin record. We try to show that, twenty years after its publication, H. antecessor provides a good opportunity to address the morphology of the last common ancestor of Neandertals and modern humans.
    August 16, 2017   doi: 10.1002/evan.21540   open full text
  • The North African Middle Stone Age and its place in recent human evolution.
    Eleanor M. L. Scerri.
    Evolutionary Anthropology Issues News and Reviews. June 19, 2017
    The North African Middle Stone Age (NAMSA, ∼300‐24 thousand years ago, or ka) features what may be the oldest fossils of our species as well as extremely early examples of technological regionalization and ‘symbolic’ material culture (d'Errico, Vanhaeren, Barton, Bouzouggar, Mienis, Richter, Hublin, McPherron, Louzouet, & Klein, ; Scerri, ; Richter, Grün, Joannes‐Boyau, Steele, Amani, Rué, Fernandes, Raynal, Geraads, Ben‐Ncer Hublin, McPherron, ). The geographic situation of North Africa and an increased understanding of the wet‐dry climatic pulses of the Sahara Desert also show that North Africa played a strategic role in continental‐scale evolutionary processes by modulating human dispersal and demographic structure (Drake, Blench, Armitage, Bristow, & White, ; Blome, Cohen, Tryon, Brooks, & Russell, ). However, current understanding of the NAMSA remains patchy and subject to a bewildering array of industrial nomenclatures that mask underlying variability. These issues are compounded by a geographic research bias skewed toward non‐desert regions. As a result, it has been difficult to test long‐established narratives of behavioral and evolutionary change in North Africa and to resolve debates on their wider significance. In order to evaluate existing data and identify future research directions, this paper provides a critical overview of the component elements of the NAMSA and shows that the timing of many key behaviors has close parallels with others in sub‐Saharan Africa and Southwest Asia.
    June 19, 2017   doi: 10.1002/evan.21527   open full text
  • The evolutionary radiation of plesiadapiforms.
    Mary T. Silcox, Jonathan I. Bloch, Doug M. Boyer, Stephen G. B. Chester, Sergi López‐Torres.
    Evolutionary Anthropology Issues News and Reviews. April 21, 2017
    Very shortly after the disappearance of the non‐avian dinosaurs, the first mammals that had features similar to those of primates started appearing. These first primitive forms went on to spawn a rich diversity of plesiadapiforms, often referred to as archaic primates. Like many living primates, plesiadapiforms were small arboreal animals that generally ate fruit, insects, and, occasionally, leaves. However, this group lacked several diagnostic features of euprimates. They also had extraordinarily diverse specializations, represented in eleven families and more than 140 species, which, in some cases, were like nothing seen since in the primate order. Plesiadapiforms are known from all three Northern continents, with representatives that persisted until at least 37 million years ago. In this article we provide a summary of the incredible diversity of plesiadapiform morphology and adaptations, reviewing our knowledge of all eleven families. We also discuss the challenges that remain in our understanding of their ecology and evolution.
    April 21, 2017   doi: 10.1002/evan.21526   open full text
  • The Tsimane Health and Life History Project: Integrating anthropology and biomedicine.
    Michael Gurven, Jonathan Stieglitz, Benjamin Trumble, Aaron D. Blackwell, Bret Beheim, Helen Davis, Paul Hooper, Hillard Kaplan.
    Evolutionary Anthropology Issues News and Reviews. April 21, 2017
    The Tsimane Health and Life History Project, an integrated bio‐behavioral study of the human life course, is designed to test competing hypotheses of human life‐history evolution. One aim is to understand the bidirectional connections between life history and social behavior in a high‐fertility, kin‐based context lacking amenities of modern urban life (e.g. sanitation, banks, electricity). Another aim is to understand how a high pathogen burden influences health and well‐being during development and adulthood. A third aim addresses how modernization shapes human life histories and sociality. Here we outline the project's goals, history, and main findings since its inception in 2002. We reflect on the implications of current findings and highlight the need for more coordinated ethnographic and biomedical study of contemporary nonindustrial populations to address broad questions that can situate evolutionary anthropology in a key position within the social and life sciences.
    April 21, 2017   doi: 10.1002/evan.21515   open full text
  • Mother's little helpers: What we know (and don't know) about cooperative infant care in callitrichines.
    Wendy M. Erb, Leila M. Porter.
    Evolutionary Anthropology Issues News and Reviews. February 24, 2017
    Since Darwin (), scientists have been puzzled by how behaviors that impose fitness costs on helpers while benefiting their competitors could evolve through natural selection. Hamilton's () theory of inclusive fitness provided an explanation by showing how cooperative behaviors could be adaptive if directed at closely related kin. Recent studies, however, have begun to question whether kin selection is sufficient to explain cooperative behavior in some species (Bergmüller, Johnstone, Russell, & Bshary, ). Many researchers have instead emphasized the importance of direct fitness benefits for helpers in the evolution of cooperative breeding systems. Furthermore, individuals can vary in who, when, and how much they help, and the factors that affect this variation are poorly understood (Cockburn, ; Heinsohn, ). Cooperative breeders thus provide excellent models for the study of evolutionary theories of cooperation and conflict (Cant, ).
    February 24, 2017   doi: 10.1002/evan.21516   open full text
  • The crown joules: energetics, ecology, and evolution in humans and other primates.
    Herman Pontzer.
    Evolutionary Anthropology Issues News and Reviews. February 24, 2017
    Biological diversity is metabolic diversity: Differences in anatomy, physiology, life history, and activity reflect differences in energy allocation and expenditure among traits and tasks. Traditional frameworks in primatology, human ecology, public health, and paleoanthropology view daily energy expenditure as being more variable within than between species, changing with activity level but essentially fixed for a given body size. Growing evidence turns this view on its head. Total energy expenditure (kcal/d), varies relatively little within species, despite variation in physical activity; it varies considerably among species even after controlling for the effect of body size. Embracing this emerging paradigm requires rethinking potential trade‐offs in energy allocation within and between species, assessing evidence of metabolic acceleration within lineages, and abandoning activity‐based estimates of total energy expenditure. Difficult and exciting work lies ahead in the effort to untangle the ecological and evolutionary pressures shaping primate metabolic diversity.
    February 24, 2017   doi: 10.1002/evan.21513   open full text
  • Tropical forests and the genus Homo.
    Patrick Roberts, Nicole Boivin, Julia Lee‐Thorp, Michael Petraglia, Jay Stock.
    Evolutionary Anthropology Issues News and Reviews. December 22, 2016
    Tropical forests constitute some of the most diverse and complex terrestrial ecosystems on the planet. From the Miocene onward, they have acted as a backdrop to the ongoing evolution of our closest living relatives, the great apes, and provided the cradle for the emergence of early hominins, who retained arboreal physiological adaptations at least into the Late Pliocene. There also now exists growing evidence, from the Late Pleistocene onward, for tool‐assisted intensification of tropical forest occupation and resource extraction by our own species, Homo sapiens. However, between the Late Pliocene and Late Pleistocene there is an apparent gap in clear and convincing evidence for the use of tropical forests by hominins, including early members of our own genus. In discussions of Late Pliocene and Early Pleistocene hominin evolution, including the emergence and later expansion of Homo species across the globe, tropical forest adaptations tend to be eclipsed by open, savanna environments. Thus far, it is not clear whether this Early‐Middle Pleistocene lacuna in Homo‐rainforest interaction is real and representative of an adaptive shift with the emergence of our species or if it is simply reflective of preservation bias.
    December 22, 2016   doi: 10.1002/evan.21508   open full text
  • The psychology of cooperation: Insights from chimpanzees and children.
    Alicia P. Melis, Felix Warneken.
    Evolutionary Anthropology Issues News and Reviews. December 22, 2016
    Across all cultures, humans engage in cooperative activities that can be as simple as preparing a meal or sharing food with others and as complex as playing in an orchestra or donating to charity. Although intraspecific cooperation exists among many other animal species, only humans engage in such a wide array of cooperative interaction and participate in large‐scale cooperation that extends beyond kin and even includes strangers.
    December 22, 2016   doi: 10.1002/evan.21507   open full text
  • Cooperation, collective action, and the archeology of large‐scale societies.
    David M. Carballo, Gary M. Feinman.
    Evolutionary Anthropology Issues News and Reviews. December 22, 2016
    Archeologists investigating the emergence of large‐scale societies in the past have renewed interest in examining the dynamics of cooperation as a means of understanding societal change and organizational variability within human groups over time. Unlike earlier approaches to these issues, which used models designated voluntaristic or managerial, contemporary research articulates more explicitly with frameworks for cooperation and collective action used in other fields, thereby facilitating empirical testing through better definition of the costs, benefits, and social mechanisms associated with success or failure in coordinated group action. Current scholarship is nevertheless bifurcated along lines of epistemology and scale, which is understandable but problematic for forging a broader, more transdisciplinary field of cooperation studies. Here, we point to some areas of potential overlap by reviewing archeological research that places the dynamics of social cooperation and competition in the foreground of the emergence of large‐scale societies, which we define as those having larger populations, greater concentrations of political power, and higher degrees of social inequality. We focus on key issues involving the communal‐resource management of subsistence and other economic goods, as well as the revenue flows that undergird political institutions. Drawing on archeological cases from across the globe, with greater detail from our area of expertise in Mesoamerica, we offer suggestions for strengthening analytical methods and generating more transdisciplinary research programs that address human societies across scalar and temporal spectra.
    December 22, 2016   doi: 10.1002/evan.21506   open full text
  • A Comparison Between Bonobos and Chimpanzees: A Review and Update.
    Thibaud Gruber, Zanna Clay.
    Evolutionary Anthropology Issues News and Reviews. October 18, 2016
    Chimpanzees (Pan troglodytes) and bonobos (P. paniscus) are our closest living relatives, with the human lineage diverging from the Pan lineage only around five to seven Mya, but possibly as early as eight Mya.1–2 Chimpanzees and bonobos even share genetic similarities with humans that they do not share with each other.2 Given their close genetic relationship to humans, both Pan species represent crucial living models for reconstructing our last common ancestor (LCA) and identifying uniquely human features. Comparing the similarities and differences of the two Pan is thus essential for constructing balanced models of human evolution.3
    October 18, 2016   doi: 10.1002/evan.21501   open full text
  • Digestive enzymes of human and nonhuman primates.
    Mareike Cora Janiak.
    Evolutionary Anthropology Issues News and Reviews. October 18, 2016
    All living organisms need to consume nutrients to grow, survive, and reproduce, making the successful acquisition of food resources a powerful selective pressure. However, acquiring food is only part of the challenge. While all animals spend much of their daily activity budget hunting, searching for, or otherwise procuring food, a large part of what is involved in overall nutrition occurs once the meal has been swallowed. Most nutritional components are too complex for immediate use and must be broken down into simpler compounds, which can then be absorbed by the body. This process, digestion, is catalyzed by enzymes that are either endogenous or produced by the host's microbial population.1 Research shows that the nutritional value of food is partially constrained by the digestive abilities of the microbial community present in the host's gut and that these microbes rapidly adapt to changes in diet and other environmental pressures.2 An accumulating body of evidence suggests that endogenously produced digestive enzymes also have been, and still are, common targets of natural selection, further cementing their crucial role in an organism's digestive system.3–5
    October 18, 2016   doi: 10.1002/evan.21498   open full text
  • Archeological insights into hominin cognitive evolution.
    Thomas Wynn, Frederick L. Coolidge.
    Evolutionary Anthropology Issues News and Reviews. August 13, 2016
    How did the human mind evolve? How and when did we come to think in the ways we do? The last thirty years have seen an explosion in research related to the brain and cognition. This research has encompassed a range of biological and social sciences, from epigenetics and cognitive neuroscience to social and developmental psychology. Following naturally on this efflorescence has been a heightened interest in the evolution of the brain and cognition. Evolutionary scholars, including paleoanthropologists, have deployed the standard array of evolutionary methods. Ethological and experimental evidence has added significantly to our understanding of nonhuman brains and cognition, especially those of nonhuman primates. Studies of fossil brains through endocasts and sophisticated imaging techniques have revealed evolutionary changes in gross neural anatomy. Psychologists have also gotten into the game through application of reverse engineering to experimentally based descriptions of cognitive functions. For hominin evolution, there is another rich source of evidence of cognition, the archeological record. Using the methods of Paleolithic archeology and the theories and models of cognitive science, evolutionary cognitive archeology documents developments in the hominin mind that would otherwise be inaccessible.
    August 13, 2016   doi: 10.1002/evan.21496   open full text
  • The evolution of inequality.
    Siobhán M. Mattison, Eric A. Smith, Mary K. Shenk, Ethan E. Cochrane.
    Evolutionary Anthropology Issues News and Reviews. August 13, 2016
    Understanding how systems of political and economic inequality evolved from relatively egalitarian origins has long been a focus of anthropological inquiry. Many hypotheses have been suggested to link socio‐ecological features with the rise and spread of inequality, and empirical tests of these hypotheses in prehistoric and extant societies are increasing. In this review, we synthesize several streams of theory relevant to understanding the evolutionary origins, spread, and adaptive significance of inequality. We argue that while inequality may be produced by a variety of localized processes, its evolution is fundamentally dependent on the economic defensibility and transmissibility of wealth. Furthermore, these properties of wealth could become persistent drivers of inequality only following a shift to a more stable climate in the Holocene. We conclude by noting several key areas for future empirical research, emphasizing the need for more analyses of contemporary shifts toward institutionalized inequality as well as prehistoric cases.
    August 13, 2016   doi: 10.1002/evan.21491   open full text
  • Hunter‐gatherer mobility and embedded raw‐material procurement strategies in the mediterranean upper paleolithic.
    Antonin Tomasso, Guillaume Porraz.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Since the early 1980s, the sourcing of lithic raw materials has become central to studies of the territorial range and mobility strategies of Pleistocene foraging societies. Results have been fruitful but somehow repetitive. We will discuss the embedded procurement strategy, which presumes that raw material acquisition was part of other subsistence activities rather than an autonomous technological task. We argue that this theoretical assumption, when taken as dogma, restricts the role of technology in human history and also underestimates the way some lithic resources may have affected the organization of past hunter‐gatherers. We base our discussion on the Upper Paleolithic (UP) from the Liguro‐Provençal arc, with examples from the Proto‐Aurignacian and the Epigravettian. Our regional record shows that in this context the movement of rocks over distances greater than 100 km was the norm rather than the exception. We argue that these long‐distance procurements mirror technical needs that were oriented toward the selection of high‐quality flints. We support the hypothesis that indirect procurement was an important component of regional socio‐economic networks.
    June 17, 2016   doi: 10.1002/evan.21488   open full text
  • Time and space in the middle paleolithic: Spatial structure and occupation dynamics of seven open‐air sites.
    Amy E. Clark.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    The spatial structure of archeological sites can help reconstruct the settlement dynamics of hunter‐gatherers by providing information on the number and length of occupations. This study seeks to access this information through a comparison of seven sites. These sites are open‐air and were all excavated over large spatial areas, up to 2,000 m2, and are therefore ideal for spatial analysis, which was done using two complementary methods, lithic refitting and density zones. Both methods were assessed statistically using confidence intervals. The statistically significant results from each site were then compiled to evaluate trends that occur across the seven sites. These results were used to assess the “spatial consistency” of each assemblage and, through that, the number and duration of occupations. This study demonstrates that spatial analysis can be a powerful tool in research on occupation dynamics and can help disentangle the many occupations that often make up an archeological assemblage.
    June 17, 2016   doi: 10.1002/evan.21486   open full text
  • Mobility at the scale of meters.
    Todd A. Surovell, Matthew O'Brien.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    When archeologists discuss mobility, we are most often referring to a phenomenon that operates on the scale of kilometers, but much of human mobility, at least if measured in terms of frequency of movement, occurs at much smaller scales, ranging from centimeters to tens of meters. Here we refer to the movements we make within the confines of our homes or places of employment. With respect to nomadic peoples, movements at this scale would include movements within campsites. Understanding mobility at small scales is important to archeology because small‐scale mobility decisions are a critical factor affecting spatial patterning observed in archeological sites. In this paper, we examine the factors affecting small‐scale mobility decisions in a Mongolian reindeer herder summer camp and the implications of those decisions with regard to archeological spatial patterning.
    June 17, 2016   doi: 10.1002/evan.21487   open full text
  • Reading the landscape: Legible environments and hominin dispersals.
    Dario Guiducci, Ariane Burke.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Wayfinding, or the ability to plan and navigate a course over the landscape, is a subject of investigation in geography, neurophysiology, psychology, urban planning, and landscape design. With the prevalence of GPS‐assisted navigation systems, or “wayfinders,” computer scientists are also increasingly interested in understanding how people plan their movements and guide others. However, the importance of wayfinding as a process that regulates human mobility has only recently been incorporated into archeological research design. Hominin groups were able to disperse widely during the course of prehistory. The scope of these dispersals speaks to the innate navigation abilities of hominins. Their long‐term success must have depended on an ability to communicate spatial information effectively. Here, we consider the extent to which some landscapes may have been more conducive to wayfinding than others. We also describe a tool we have created for quantifying landscape legibility (sensu Gollege), a complex and under‐explored concept in archeology, with a view to investigating the impact of landscape structure on human wayfinding and thus, patterns of dispersal during prehistory. To this end, we have developed a method for quantifying legibility using a Geographic Information System (GIS) and apply it to a test case in prehistoric Iberia.
    June 17, 2016   doi: 10.1002/evan.21484   open full text
  • The ecological and evolutionary energetics of hunter‐gatherer residential mobility.
    Marcus J. Hamilton, José Lobo, Eric Rupley, Hyejin Youn, Geoffrey B. West.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Residential mobility is a key aspect of hunter‐gatherer foraging economies and therefore is an issue of central importance in hunter‐gatherer studies. Hunter‐gatherers vary widely in annual rates of residential mobility. Understanding the sources of this variation has long been of interest to anthropologists and archeologists. The vast majority of hunter‐gatherers who are dependent on terrestrial plants and animals move camp multiple times a year because local foraging patches become depleted and food, material, and social resources are heterogeneously distributed through time and space. In some environments, particularly along coasts, where resources are abundant and predictable, hunter‐gatherers often become effectively sedentary. But even in these special cases, a central question is how these societies have maintained viable foraging economies while reducing residential mobility to near zero.
    June 17, 2016   doi: 10.1002/evan.21485   open full text
  • Home‐range size in large‐bodied carnivores as a model for predicting neandertal territory size.
    Steven Emilio Churchill, Christopher Scott Walker, Adam Michael Schwartz.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Adult human foragers expend roughly 30–60 kcal per km in unburdened walking at optimal speeds.1,2 In the context of foraging rounds and residential moves, they may routinely travel distances of 50–70 km per week, often while carrying loads.3 Movement on the landscape, then, is arguably the single most expensive item in the activity budgets of hunter‐gatherers. Mobility costs may have been greater still for Neandertals. They had stocky, short‐limbed physiques that were energetically costly to move4 and lived in relatively unproductive Pleistocene environments5 that may have required greater movement to deal with problems of biodepletion and resource patchiness.6 But just how mobile were the Neandertals?
    June 17, 2016   doi: 10.1002/evan.21483   open full text
  • Pyrodiversity and the anthropocene: the role of fire in the broad spectrum revolution.
    Douglas W. Bird, Rebecca Bliege Bird, Brian F. Codding.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    The Anthropocene colloquially refers to a global regime of human‐caused environmental modification of earth systems associated with profound changes in patterns of human mobility, as well as settlement and resource use compared with prior eras. Some have argued that the processes generating the Anthropocene are mainly associated with population growth and technological innovation, and thus began only in the late Holocene under conditions of dense sedentism and industrial agriculture.1 However, it now seems clear that the roots of the Anthropocene lie in complex processes of intensification that significantly predate transitions to agriculture.2,3 What intensification is remains less clear. For some it is increasing economic productivity that increases carrying capacity, the drivers of which may be too diverse and too local to generalize.4,5 For others using Boserup's ideas about agrarian intensification, increasing density in hunter‐gatherer populations can produce declines in subsistence efficiency that increase incentives for investing labor to boost yield per unit area, which then elevates Malthusian limits on carrying capacity.6–8 As Morgan9 demonstrates in a comprehensive review, the legacy of such Boserupian intensification is alive, well, and controversial in hunter‐gatherer archeology. This is a result of its potential for illuminating processes involved in transformations of forager socio‐political and economic systems, including those dominated by harvesting more immediate‐return resources and high residential mobility as well as those characterized by more delayed‐return material economies with reduced residential mobility, a broader spectrum of resources, degrees of storage, and greater social stratification. Here we detail hypotheses about the processes involved in such transitions and explore the way that anthropogenic disturbance of ecosystems, especially the use of landscape fire, could be fundamentally entangled with many broad‐spectrum revolutions associated with intensified foraging systems.
    June 17, 2016   doi: 10.1002/evan.21482   open full text
  • Mobility as an emergent property of biological organization: Insights from experimental evolution.
    Ian J. Wallace, Theodore Garland.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Anthropologists accept that mobility is a critical dimension of human culture, one that links economy, technology, and social relations. Less often acknowledged is that mobility depends on complex and dynamic interactions between multiple levels of our biological organization, including anatomy, physiology, neurobiology, and genetics. Here, we describe a novel experimental approach to examining the biological foundations of mobility, using mice from a long‐term artificial selection experiment for high levels of voluntary exercise on wheels. In this experiment, mice from selectively bred lines have evolved to run roughly three times as far per day as those from nonselected control lines. We consider three insights gleaned from this experiment as foundational principles for the study of mobility from the perspective of biological evolution. First, an evolutionary change in mobility will necessarily be associated with alterations in biological traits both directly and indirectly connected to mobility. Second, changing mobility will result in trade‐offs and constraints among some of the affected traits. Third, multiple solutions exist to altering mobility, so that various combinations of adjustments to traits linked with mobility can achieve the same overall behavioral outcome. We suggest that anthropological knowledge of variation in human mobility might be improved by greater research attention to its biological dimensions.
    June 17, 2016   doi: 10.1002/evan.21481   open full text
  • What moves us? How mobility and movement are at the center of human evolution.
    Steven L. Kuhn, David A. Raichlen, Amy E. Clark.
    Evolutionary Anthropology Issues News and Reviews. June 17, 2016
    Movement is central to the survival of all free‐living organisms. Consequently, movement and what anthropologists often refer to as mobility, which is the sum of small‐scale movements tracked across larger geographic and temporal scales, are key targets of selection. Movement and mobility also underpin many of the key features that make us human and that allowed our lineage to adapt to changing environments across the globe. The most obvious example is the evolution of humans' singular mode of locomotion. Bipedalism is arguably the most important derived anatomical trait of the hominin lineage. The mechanisms and circumstances that gave rise to this novel mode of movement remain subjects of intense research.
    June 17, 2016   doi: 10.1002/evan.21480   open full text
  • Beringia and the global dispersal of modern humans.
    John F. Hoffecker, Scott A. Elias, Dennis H. O'Rourke, G. Richard Scott, Nancy H. Bigelow.
    Evolutionary Anthropology Issues News and Reviews. April 08, 2016
    Until recently, the settlement of the Americas seemed largely divorced from the out‐of‐Africa dispersal of anatomically modern humans, which began at least 50,000 years ago. Native Americans were thought to represent a small subset of the Eurasian population that migrated to the Western Hemisphere less than 15,000 years ago. Archeological discoveries since 2000 reveal, however, that Homo sapiens occupied the high‐latitude region between Northeast Asia and northwest North America (that is, Beringia) before 30,000 years ago and the Last Glacial Maximum (LGM). The settlement of Beringia now appears to have been part of modern human dispersal in northern Eurasia. A 2007 model, the Beringian Standstill Hypothesis, which is based on analysis of mitochondrial DNA (mtDNA) in living people, derives Native Americans from a population that occupied Beringia during the LGM. The model suggests a parallel between ancestral Native Americans and modern human populations that retreated to refugia in other parts of the world during the arid LGM. It is supported by evidence of comparatively mild climates and rich biota in south‐central Beringia at this time (30,000‐15,000 years ago). These and other developments suggest that the settlement of the Americas may be integrated with the global dispersal of modern humans.
    April 08, 2016   doi: 10.1002/evan.21478   open full text
  • The pyrophilic primate hypothesis.
    Christopher H. Parker, Earl R. Keefe, Nicole M. Herzog, James F. O'connell, Kristen Hawkes.
    Evolutionary Anthropology Issues News and Reviews. April 08, 2016
    Members of genus Homo are the only animals known to create and control fire. The adaptive significance of this unique behavior is broadly recognized, but the steps by which our ancestors evolved pyrotechnic abilities remain unknown. Many hypotheses attempting to answer this question attribute hominin fire to serendipitous, even accidental, discovery. Using recent paleoenvironmental reconstructions, we present an alternative scenario in which, 2 to 3 million years ago in tropical Africa, human fire dependence was the result of adapting to progressively fire‐prone environments. The extreme and rapid fluctuations between closed canopy forests, woodland, and grasslands that occurred in tropical Africa during that time, in conjunction with reductions in atmospheric carbon dioxide levels, changed the fire regime of the region, increasing the occurrence of natural fires. We use models from optimal foraging theory to hypothesize benefits that this fire‐altered landscape provided to ancestral hominins and link these benefits to steps that transformed our ancestors into a genus of active pyrophiles whose dependence on fire for survival contributed to its rapid expansion out of Africa.
    April 08, 2016   doi: 10.1002/evan.21475   open full text
  • How humans evolved large brains: Comparative evidence.
    Karin Isler, Carel P. Van Schaik.
    Evolutionary Anthropology Issues News and Reviews. April 20, 2014
    The human brain is about three times as large as that of our closest living relatives, the great apes. Overall brain size is a good predictor of cognitive performance in a variety of tests in primates. Therefore, hypotheses explaining the evolution of this remarkable difference have attracted much interest. In this review, we give an overview of the current evidence from comparative studies testing these hypotheses. If cognitive benefits are diverse and ubiquitous, it is possible that most of the variation in relative brain size among extant primates is explained by variation in the ability to avoid the fitness costs of increased brain size (allocation trade‐offs and increased minimum energy needs). This is indeed what we find, suggesting that an energetic perspective helps to complement approaches to explain variation in brain size that postulate cognitive benefits. The expensive brain framework also provides a coherent scenario for how these factors may have shaped early hominin brain expansion.
    April 20, 2014   doi: 10.1002/evan.21403   open full text
  • Natural cooperators: Food sharing in humans and other primates.
    Adrian V. Jaeggi, Michael Gurven.
    Evolutionary Anthropology Issues News and Reviews. August 13, 2013
    The study of cooperation is rich with theoretical models and laboratory experiments that have greatly advanced our knowledge of human uniqueness, but have sometimes lacked ecological validity. We therefore emphasize the need to tie discussions of human cooperation to the natural history of our species and its closest relatives, focusing on behavioral contexts best suited to reveal underlying selection pressures and evolved decision rules. Food sharing is a fundamental form of cooperation that is well‐studied across primates and is particularly noteworthy because of its central role in shaping evolved human life history, social organization, and cooperative psychology. Here we synthesize available evidence on food sharing in humans and other primates, tracing the origins of offspring provisioning, mutualism, trade, and reciprocity throughout the primate order. While primates may gain some benefits from sharing, humans, faced with more collective action problems in a risky foraging niche, expanded on primate patterns to buffer risk and recruit mates and allies through reciprocity and signaling, and established co‐evolving social norms of production and sharing. Differences in the necessity for sharing are reflected in differences in sharing psychology across species, thus helping to explain unique aspects of our evolved cooperative psychology.
    August 13, 2013   doi: 10.1002/evan.21364   open full text
  • Understanding primate communities: Recent developments and future directions.
    Jason M. Kamilar, Lydia Beaudrot.
    Evolutionary Anthropology Issues News and Reviews. August 13, 2013
    In 1999, the edited volume Primate Communities presented several studies that examined broad‐scale patterns of primate diversity.1 Similar studies were being conducted on nonprimate taxa; advances in data availability and statistical approaches were allowing scientists to investigate a variety of new questions and to reexamine classical questions in novel ways. While such studies on nonprimate taxa have continued at a steady pace, they have only crept forward for primate species (Fig. ). In the intervening time, the field of macroecology (Box 1) rapidly developed and has resulted in several books and the establishment of new research institutes. We suggest that examining primate communities, especially in a macroecological context, is an important line of research for our field to embrace and an area where biological anthropologists can provide major contributions. We review the current state of research, describe new datasets and research tools, and suggest future research directions.
    August 13, 2013   doi: 10.1002/evan.21361   open full text