Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secon... more Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secondary extinctions and shifting selective pressures reshape ecosystems. Megafaunal browsers and grazers are major ecosystem engineers, they: keep woody vegetation suppressed; are nitrogen cyclers; and serve as seed dispersers. Most angiosperms possess sets of physiological traits that allow for the fixation of mutualisms with megafauna; some of these traits appear to serve as exaptation (preadaptation) features for farming. As an easily recognized example, fleshy fruits are, an exaptation to agriculture, as they evolved to recruit a non-human disperser. We hypothesize that the traits of rapid annual growth, self-compatibility, heavy investment in reproduction, high plasticity (wide reaction norms), and rapid evolvability were part of an adaptive syndrome for megafaunal seed dispersal. We review the evolutionary importance that megafauna had for crop and weed progenitors and discuss possibl...
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
Genetic modification (GM) of crop plants is frequently described by its proponents as a continuat... more Genetic modification (GM) of crop plants is frequently described by its proponents as a continuation of the ancient process of domestication. While domestication, crop breeding, and GM all modify the genomes and phenotypes of plants, GM fundamentally differs from domestication in terms of the biological and sociopolitical processes by which change occurs, and the subsequent impacts on agrobiodiversity and seed sovereignty. We review the history of domestication, crop breeding, and GM, and show that crop breeding and GM are continuous with each other in many important ways, but represent a momentous break from domestication because they move plant evolution off of farms and into centralized institutions. The social contexts in which these processes unfold dictate who holds rights to germplasm and agricultural knowledge, shape incentives to effect particular kinds of changes in our crops, and create or constrict biodiversity. Presenting GM as a continuation of domestication puts forward a false equivalency that fundamentally misrepresents how domestication, crop breeding, and GM occur. In doing so, this narrative diminishes public understanding of these important processes and obscures the effects of industrial agriculture on in situ biodiversity and the practice of farming. This misrepresentation is used in public-facing science communication by representatives of the biotechnology industry to silence meaningful debate on GM by convincing the public that it is the continuation of an age-old process that underlies all agricultural societies.
Process philosophy offers a metaphysical foundation for domestication studies. This grounding is ... more Process philosophy offers a metaphysical foundation for domestication studies. This grounding is especially important given the European colonialist origin of 'domestication' as a term and 19th century cultural project. We explore the potential of process archaeology for deep-time investigation of domestication relationships, drawing attention to the variable pace of domestication as an ongoing process within and across taxa; the nature of domestication 'syndromes' and 'pathways' as general hypotheses about process; the importance of cooperation as well as competition among humans and other organisms; the significance of non-human agency; and the ubiquity of hybrid communities that resist the simple wild/domestic dichotomy.
Eleusine coracana (finger millet) is a nutritious and easily storable grain that can be grown in ... more Eleusine coracana (finger millet) is a nutritious and easily storable grain that can be grown in unfavourable environments and is important to the food security of millions of farmers in Africa and South Asia. Despite its importance and promise as a sustainable crop for smallholders in the Global South, its history remains poorly understood. Eleusine coracana has only rarely been recovered from archaeological sites in the region of Africa where it was domesticated and never in quantities large enough to study its evolution under cultivation. Here we report on a large assemblage of Iron Age (ca. 900-700 cal bp) E. coracana grains recovered from Kakapel rock shelter in western Kenya. We also carried out carbonization experiments on modern grains in order to directly compare these archaeological specimens to extant landraces. We found that finger millet is only well preserved when carbonized at temperatures lower than 220 °C, which may contribute to its scarcity in the archaeological record. Eleusine coracana shrinks but does not significantly change shape when carbonized. When corrected for the effects of carbonization, the E. coracana grown by Iron Age farmers at Kakapel was smaller grained than modern landraces, but is nonetheless identifiable as domesticated on the basis of grain shape and surface texture. A comparison with other Iron Age E. coracana reveals considerable variation in the grain size of landraces cultivated during this era. This is the largest quantitative morphometric analysis of E. coracana grains ever conducted, and provides a basis for the interpretation of other archaeological populations. This assemblage is also the first evidence for E. coracana cultivation in western Kenya, a biodiversity hotspot for landraces of this crop today.
Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secon... more Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secondary extinctions and shifting selective pressures reshape ecosystems. Megafaunal browsers and grazers are major ecosystem engineers, they: keep woody vegetation suppressed; are nitrogen cyclers; and serve as seed dispersers. Most angiosperms possess sets of physiological traits that allow for the fixation of mutualisms with megafauna; some of these traits appear to serve as exaptation (preadaptation) features for farming. As an easily recognized example, fleshy fruits are, an exaptation to agriculture, as they evolved to recruit a non-human disperser. We hypothesize that the traits of rapid annual growth, self-compatibility, heavy investment in reproduction, high plasticity (wide reaction norms), and rapid evolvability were part of an adaptive syndrome for megafaunal seed dispersal. We review the evolutionary importance that megafauna had for crop and weed progenitors and discuss possible ramifications of their extinction on: (1) seed dispersal; (2) population dynamics; and (3) habitat loss. Humans replaced some of the ecological services that had been lost as a result of late Quaternary extinctions and drove rapid evolutionary change resulting in domestication.
Long-term interactions between people and places has been a focal point for archaeologists since ... more Long-term interactions between people and places has been a focal point for archaeologists since the beginnings of the discipline. Monuments are one analytical unit of analysis that archaeologists regularly study and interpret as evidence for the ways people organize cooperative labor and inscribe on the landscape their connections to it. However, it is rare to acquire data that affords a rich and long-term description of the landscape before, during, and after a monument was built. In addition, archaeologists who study pre-textual societies are seldom afforded an opportunity to explore detailed questions relating to how monuments were engaged with after social dis-positions toward them changed. In this article we present diverse datasets obtained from a small Middle Woodland (ca. 200 cal BC-cal AD 500) ditch and embankment enclosure in the Middle Ohio Valley, USA. Drawing on those data, we offer a detailed biographical description of the site that illustrates how pre-construction use of the area influenced construction of the enclosure, describes how the enclosure was used after construction, and indicates what happened when the enclosure became evaluated differently in society.
Scholars have argued that plant domestication in eastern North America involved human interaction... more Scholars have argued that plant domestication in eastern North America involved human interactions with floodplain weeds in woodlands that had few other early successional environments. Archeological evidence for plant domestication in this region occurs along the Mississippi river and major tributaries such as the Tennessee, Ohio, Illinois, Missouri, and Arkansas rivers. But this region is also known as the prairie peninsula: a prairie-woodland mosaic that was maintained by anthropogenic fire starting as early as 6000 BP. Contrary to conventional wisdom, recent research has shown that bison were also present in the prairie peninsula throughout the Holocene. Recent reintroductions of bison to tallgrass prairies have allowed ecologists to study the effects of their grazing on this ecosystem for the first time. Like rivers and humans, bison create early successional habitats for annual forbs and grasses, including the progenitors of eastern North American crops, within tallgrass prairies. Our fieldwork has shown that crop progenitors are conspicuous members of plant communities along bison trails and in wallows. We argue that ancient foragers encountered dense, easily harvestable stands of crop progenitors as they moved along bison trails, and that the ecosystems created by bison and anthropogenic fire served as a template for the later agroecosystem of this region. Without denying the importance of human-river interactions highlighted by previous researchers, we suggest that prairies have been ignored as possible loci for domestication, largely because the disturbed, biodiverse tallgrass prairies created by bison have only been recreated in the past three decades after a century of extinction.
Since the 1930s, archaeologists have been accumulating data on the lost crops of eastern North Am... more Since the 1930s, archaeologists have been accumulating data on the lost crops of eastern North America. These are a group of annual plants (Chenopodium berlandieri, Hordeum pusillum, Iva annua, Phalaris caroliniana, and Polygonum erectum) that were cultivated by Indigenous societies for thousands of years. No published written or oral histories attest to the methods used in their cultivation, and their domesticated forms are thought to be extinct. The potentials and constraints of this agricultural system can only be reconstructed experimentally. We report two experiments designed to investigate germinability, phenology, and yield, which resulted in yield estimates for two of the lost crops, goosefoot (Chenopodium sp.) and erect knotweed (Polygonum erectum). A polyculture of these two crops is more productive than either grown as a monoculture, higher yielding than global averages for closely related domesticated crops, and comparable to yields for traditionally grown maize (Zea mays). We also report several novel insights into germination requirements and phenology for all five lost crops that contribute to a more accurate reconstruction of this crop complex. However, we failed to answer several of our research questions, and instead came away with many new questions. Obtaining seed is merely a necessary pre-condition for raising a crop. Without guidance from experienced cultivators, best practices must be developed over the course of many growing seasons. Experimentation with crop progenitors is necessary to fully understand the dynamics of ancient agroecosystems and their interaction with ecological knowledge systems.
In addition to large-seeded cereals, humans around the world during the mid-Holocene started to c... more In addition to large-seeded cereals, humans around the world during the mid-Holocene started to cultivate small-seeded species of herbaceous annuals for grain, including quinoa, amaranth, buckwheat, the millets and several lost crops domesticated in North America. The wild ancestors of these crops have small seeds with indigestible defences and do not germinate readily. Today, these wild plants exist in small fragmentary stands that are not appealing targets for foragers. This combination of traits has led many to argue that they must have been a food of last resort. We propose a new explanation: the domestication of small-seeded annuals involved a switch from endozoochoric dispersal (through animal ingestion) to human dispersal. Humans encountered these plants in dense stands created by grazing megafauna, making them easy to harvest. As humans began to cultivate these plants they took on the functional role of seed dispersers, and traits associated with endozoochory were lost or reduced. The earliest traits of domestication—thinning or loss of indigestible seed protections, loss of dormancy and increased seed size—can all be explained by the loss of the ruminant dispersal process and concomitant human management of wild stands. We demonstrate, by looking at rangeland ecology and herd animal herbivory patterns, that the progenitors of all of these species evolved to be dispersed by megafaunal ruminants and that heavy herbivory leads to dense homogenous clusters of endozoochoric plants. Hence, easily harvested stands on nitrogen hot spots near water sources would have existed in regions where these plants were domesticated. Future experimental and ecological studies could enhance our understanding of the relationships between specific crops and their possible ruminant dispersers.
Relatively few farmers today actively maintain crop biodiversity, but for most of the history of ... more Relatively few farmers today actively maintain crop biodiversity, but for most of the history of agriculture this was the norm. Archaeobotanical analyses can reveal the processes that led to the evolution of crop biodiversity throughout the Holocene, an issue of critical importance in an era of climate change and agrobiodiversity loss. Indigenous eastern North Americans domesticated several annual seed crops, called the Eastern Agricultural Complex, beginning c. 1800 BC. Using population morphometrics, this paper reports new evidence for the evolution of a domesticated sub-species of one of these crops, erect knotweed (Polyongum erectum L.), and its subsequent diversification under cultivation. Morphometric analyses were conducted on archaeological erect knotweed populations spanning its ancient cultivated range, and these were directly dated to c. 1–1350 AD, anchoring the evolution of this crop in both time and space. Domesticated erect knotweed first appears c. 1 AD in the Middle Ohio Valley. A diachronic series of populations from western Illinois shows that this species was domesticated again c. 150–1000 AD. This study shows how agricultural knowledge and material were maintained and shared (or not) by communities during an important era in eastern North America's history: when small communities were aggregating to form the earliest urban center at Cahokia, in the American Bottom floodplain. A distinctive landrace was developed by farmers in the American Bottom which is significantly different from cultivated populations in other regions. Subsequent Mississippian assemblages (c. 1000–1350 AD) indicate divergent agricultural communities of practice, and possibly the eventual feralization of erect knotweed. Archaeobotanical studies have a vast untapped potential to reveal interaction between J Archaeol Method Theory https://doi. communities, or their isolation, and to investigate the evolution of crops after initial domestication.
A B S T R A C T Archaic and Woodland period communities in eastern North America domesticated a s... more A B S T R A C T Archaic and Woodland period communities in eastern North America domesticated a suite of annual seed crops referred to the Eastern Agricultural Complex (EAC), some of which subsequently fell out of cultivation and were lost. Recently, a domesticated sub-species of one of these lost crops, erect knotweed (Polygonum erectum) has been described. This paper reports the earliest example of this domesticated sub-species, which was recovered from a sub-mound context at an Adena/Hopewell site in central Kentucky (Walker-Noe, 15Gd56) dating to c. 1 AD. Contemporary Middle Woodland erect knotweed assemblages from habitation sites in western Illinois are not domesticated. A review of the paleoethnobotanical record suggests that farmers on the western front of the Appalachian Mountains developed several innovative agricultural practices, beginning around 1000 BC, that subsequently were adopted across the core area of EAC cultivation. The ethnography and sociology of 20th and 21st century farmer networks suggests that Adena/Hopewell exchange and community integration at mounds and earthworks may have been instrumental to this process. Additional analyses of botanical assemblages from mounds and earthworks, especially morphometric analyses of crop seeds, are necessary to test this hypothesis. The dynamics of social learning involved in this process may also be implicated in the spread of crop varieties and agricultural techniques in other regions.
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
A B S T R A C T Population morphometrics can be employed to explore the process of domestication,... more A B S T R A C T Population morphometrics can be employed to explore the process of domestication, but only after accounting for biases introduced by taphonomic processes and sampling. For every cultivated plant, the challenges associated with carbonization, differential preservation, and sampling bias are different, as are the morphological characteristics of interest in domestication studies. This case study establishes correction factors and sampling parameters for assessing morphological indicators of domestication in erect knotweed (Polygonum erectum L.), an annual plant that was cultivated by Indigenous people in Eastern North America for about 2500 years. Documenting the unique domestication syndrome of erect knotweed creates three different sets of taphonomic and sampling problems that need to be addressed through experimentation and modeling: 1) Assess the morphometric effects of carbonization; 2) assess the effects of differential preservation; and 3) assess the effects of sampling error. The results of this study can be used by other analysts to identify domesticated assemblages of erect knotweed. These analyses also have implications for studies of plant domestication from the morphology of archaeological assemblages in general, especially when nominal variables are used to differentiate wild from domesticated populations (for example, the presence/absence of an abscission scar in cereals or the seed coat texture of chenopods).
Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secon... more Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secondary extinctions and shifting selective pressures reshape ecosystems. Megafaunal browsers and grazers are major ecosystem engineers, they: keep woody vegetation suppressed; are nitrogen cyclers; and serve as seed dispersers. Most angiosperms possess sets of physiological traits that allow for the fixation of mutualisms with megafauna; some of these traits appear to serve as exaptation (preadaptation) features for farming. As an easily recognized example, fleshy fruits are, an exaptation to agriculture, as they evolved to recruit a non-human disperser. We hypothesize that the traits of rapid annual growth, self-compatibility, heavy investment in reproduction, high plasticity (wide reaction norms), and rapid evolvability were part of an adaptive syndrome for megafaunal seed dispersal. We review the evolutionary importance that megafauna had for crop and weed progenitors and discuss possibl...
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
Genetic modification (GM) of crop plants is frequently described by its proponents as a continuat... more Genetic modification (GM) of crop plants is frequently described by its proponents as a continuation of the ancient process of domestication. While domestication, crop breeding, and GM all modify the genomes and phenotypes of plants, GM fundamentally differs from domestication in terms of the biological and sociopolitical processes by which change occurs, and the subsequent impacts on agrobiodiversity and seed sovereignty. We review the history of domestication, crop breeding, and GM, and show that crop breeding and GM are continuous with each other in many important ways, but represent a momentous break from domestication because they move plant evolution off of farms and into centralized institutions. The social contexts in which these processes unfold dictate who holds rights to germplasm and agricultural knowledge, shape incentives to effect particular kinds of changes in our crops, and create or constrict biodiversity. Presenting GM as a continuation of domestication puts forward a false equivalency that fundamentally misrepresents how domestication, crop breeding, and GM occur. In doing so, this narrative diminishes public understanding of these important processes and obscures the effects of industrial agriculture on in situ biodiversity and the practice of farming. This misrepresentation is used in public-facing science communication by representatives of the biotechnology industry to silence meaningful debate on GM by convincing the public that it is the continuation of an age-old process that underlies all agricultural societies.
Process philosophy offers a metaphysical foundation for domestication studies. This grounding is ... more Process philosophy offers a metaphysical foundation for domestication studies. This grounding is especially important given the European colonialist origin of 'domestication' as a term and 19th century cultural project. We explore the potential of process archaeology for deep-time investigation of domestication relationships, drawing attention to the variable pace of domestication as an ongoing process within and across taxa; the nature of domestication 'syndromes' and 'pathways' as general hypotheses about process; the importance of cooperation as well as competition among humans and other organisms; the significance of non-human agency; and the ubiquity of hybrid communities that resist the simple wild/domestic dichotomy.
Eleusine coracana (finger millet) is a nutritious and easily storable grain that can be grown in ... more Eleusine coracana (finger millet) is a nutritious and easily storable grain that can be grown in unfavourable environments and is important to the food security of millions of farmers in Africa and South Asia. Despite its importance and promise as a sustainable crop for smallholders in the Global South, its history remains poorly understood. Eleusine coracana has only rarely been recovered from archaeological sites in the region of Africa where it was domesticated and never in quantities large enough to study its evolution under cultivation. Here we report on a large assemblage of Iron Age (ca. 900-700 cal bp) E. coracana grains recovered from Kakapel rock shelter in western Kenya. We also carried out carbonization experiments on modern grains in order to directly compare these archaeological specimens to extant landraces. We found that finger millet is only well preserved when carbonized at temperatures lower than 220 °C, which may contribute to its scarcity in the archaeological record. Eleusine coracana shrinks but does not significantly change shape when carbonized. When corrected for the effects of carbonization, the E. coracana grown by Iron Age farmers at Kakapel was smaller grained than modern landraces, but is nonetheless identifiable as domesticated on the basis of grain shape and surface texture. A comparison with other Iron Age E. coracana reveals considerable variation in the grain size of landraces cultivated during this era. This is the largest quantitative morphometric analysis of E. coracana grains ever conducted, and provides a basis for the interpretation of other archaeological populations. This assemblage is also the first evidence for E. coracana cultivation in western Kenya, a biodiversity hotspot for landraces of this crop today.
Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secon... more Megafaunal extinctions are recurring events that cause evolutionary ripples, as cascades of secondary extinctions and shifting selective pressures reshape ecosystems. Megafaunal browsers and grazers are major ecosystem engineers, they: keep woody vegetation suppressed; are nitrogen cyclers; and serve as seed dispersers. Most angiosperms possess sets of physiological traits that allow for the fixation of mutualisms with megafauna; some of these traits appear to serve as exaptation (preadaptation) features for farming. As an easily recognized example, fleshy fruits are, an exaptation to agriculture, as they evolved to recruit a non-human disperser. We hypothesize that the traits of rapid annual growth, self-compatibility, heavy investment in reproduction, high plasticity (wide reaction norms), and rapid evolvability were part of an adaptive syndrome for megafaunal seed dispersal. We review the evolutionary importance that megafauna had for crop and weed progenitors and discuss possible ramifications of their extinction on: (1) seed dispersal; (2) population dynamics; and (3) habitat loss. Humans replaced some of the ecological services that had been lost as a result of late Quaternary extinctions and drove rapid evolutionary change resulting in domestication.
Long-term interactions between people and places has been a focal point for archaeologists since ... more Long-term interactions between people and places has been a focal point for archaeologists since the beginnings of the discipline. Monuments are one analytical unit of analysis that archaeologists regularly study and interpret as evidence for the ways people organize cooperative labor and inscribe on the landscape their connections to it. However, it is rare to acquire data that affords a rich and long-term description of the landscape before, during, and after a monument was built. In addition, archaeologists who study pre-textual societies are seldom afforded an opportunity to explore detailed questions relating to how monuments were engaged with after social dis-positions toward them changed. In this article we present diverse datasets obtained from a small Middle Woodland (ca. 200 cal BC-cal AD 500) ditch and embankment enclosure in the Middle Ohio Valley, USA. Drawing on those data, we offer a detailed biographical description of the site that illustrates how pre-construction use of the area influenced construction of the enclosure, describes how the enclosure was used after construction, and indicates what happened when the enclosure became evaluated differently in society.
Scholars have argued that plant domestication in eastern North America involved human interaction... more Scholars have argued that plant domestication in eastern North America involved human interactions with floodplain weeds in woodlands that had few other early successional environments. Archeological evidence for plant domestication in this region occurs along the Mississippi river and major tributaries such as the Tennessee, Ohio, Illinois, Missouri, and Arkansas rivers. But this region is also known as the prairie peninsula: a prairie-woodland mosaic that was maintained by anthropogenic fire starting as early as 6000 BP. Contrary to conventional wisdom, recent research has shown that bison were also present in the prairie peninsula throughout the Holocene. Recent reintroductions of bison to tallgrass prairies have allowed ecologists to study the effects of their grazing on this ecosystem for the first time. Like rivers and humans, bison create early successional habitats for annual forbs and grasses, including the progenitors of eastern North American crops, within tallgrass prairies. Our fieldwork has shown that crop progenitors are conspicuous members of plant communities along bison trails and in wallows. We argue that ancient foragers encountered dense, easily harvestable stands of crop progenitors as they moved along bison trails, and that the ecosystems created by bison and anthropogenic fire served as a template for the later agroecosystem of this region. Without denying the importance of human-river interactions highlighted by previous researchers, we suggest that prairies have been ignored as possible loci for domestication, largely because the disturbed, biodiverse tallgrass prairies created by bison have only been recreated in the past three decades after a century of extinction.
Since the 1930s, archaeologists have been accumulating data on the lost crops of eastern North Am... more Since the 1930s, archaeologists have been accumulating data on the lost crops of eastern North America. These are a group of annual plants (Chenopodium berlandieri, Hordeum pusillum, Iva annua, Phalaris caroliniana, and Polygonum erectum) that were cultivated by Indigenous societies for thousands of years. No published written or oral histories attest to the methods used in their cultivation, and their domesticated forms are thought to be extinct. The potentials and constraints of this agricultural system can only be reconstructed experimentally. We report two experiments designed to investigate germinability, phenology, and yield, which resulted in yield estimates for two of the lost crops, goosefoot (Chenopodium sp.) and erect knotweed (Polygonum erectum). A polyculture of these two crops is more productive than either grown as a monoculture, higher yielding than global averages for closely related domesticated crops, and comparable to yields for traditionally grown maize (Zea mays). We also report several novel insights into germination requirements and phenology for all five lost crops that contribute to a more accurate reconstruction of this crop complex. However, we failed to answer several of our research questions, and instead came away with many new questions. Obtaining seed is merely a necessary pre-condition for raising a crop. Without guidance from experienced cultivators, best practices must be developed over the course of many growing seasons. Experimentation with crop progenitors is necessary to fully understand the dynamics of ancient agroecosystems and their interaction with ecological knowledge systems.
In addition to large-seeded cereals, humans around the world during the mid-Holocene started to c... more In addition to large-seeded cereals, humans around the world during the mid-Holocene started to cultivate small-seeded species of herbaceous annuals for grain, including quinoa, amaranth, buckwheat, the millets and several lost crops domesticated in North America. The wild ancestors of these crops have small seeds with indigestible defences and do not germinate readily. Today, these wild plants exist in small fragmentary stands that are not appealing targets for foragers. This combination of traits has led many to argue that they must have been a food of last resort. We propose a new explanation: the domestication of small-seeded annuals involved a switch from endozoochoric dispersal (through animal ingestion) to human dispersal. Humans encountered these plants in dense stands created by grazing megafauna, making them easy to harvest. As humans began to cultivate these plants they took on the functional role of seed dispersers, and traits associated with endozoochory were lost or reduced. The earliest traits of domestication—thinning or loss of indigestible seed protections, loss of dormancy and increased seed size—can all be explained by the loss of the ruminant dispersal process and concomitant human management of wild stands. We demonstrate, by looking at rangeland ecology and herd animal herbivory patterns, that the progenitors of all of these species evolved to be dispersed by megafaunal ruminants and that heavy herbivory leads to dense homogenous clusters of endozoochoric plants. Hence, easily harvested stands on nitrogen hot spots near water sources would have existed in regions where these plants were domesticated. Future experimental and ecological studies could enhance our understanding of the relationships between specific crops and their possible ruminant dispersers.
Relatively few farmers today actively maintain crop biodiversity, but for most of the history of ... more Relatively few farmers today actively maintain crop biodiversity, but for most of the history of agriculture this was the norm. Archaeobotanical analyses can reveal the processes that led to the evolution of crop biodiversity throughout the Holocene, an issue of critical importance in an era of climate change and agrobiodiversity loss. Indigenous eastern North Americans domesticated several annual seed crops, called the Eastern Agricultural Complex, beginning c. 1800 BC. Using population morphometrics, this paper reports new evidence for the evolution of a domesticated sub-species of one of these crops, erect knotweed (Polyongum erectum L.), and its subsequent diversification under cultivation. Morphometric analyses were conducted on archaeological erect knotweed populations spanning its ancient cultivated range, and these were directly dated to c. 1–1350 AD, anchoring the evolution of this crop in both time and space. Domesticated erect knotweed first appears c. 1 AD in the Middle Ohio Valley. A diachronic series of populations from western Illinois shows that this species was domesticated again c. 150–1000 AD. This study shows how agricultural knowledge and material were maintained and shared (or not) by communities during an important era in eastern North America's history: when small communities were aggregating to form the earliest urban center at Cahokia, in the American Bottom floodplain. A distinctive landrace was developed by farmers in the American Bottom which is significantly different from cultivated populations in other regions. Subsequent Mississippian assemblages (c. 1000–1350 AD) indicate divergent agricultural communities of practice, and possibly the eventual feralization of erect knotweed. Archaeobotanical studies have a vast untapped potential to reveal interaction between J Archaeol Method Theory https://doi. communities, or their isolation, and to investigate the evolution of crops after initial domestication.
A B S T R A C T Archaic and Woodland period communities in eastern North America domesticated a s... more A B S T R A C T Archaic and Woodland period communities in eastern North America domesticated a suite of annual seed crops referred to the Eastern Agricultural Complex (EAC), some of which subsequently fell out of cultivation and were lost. Recently, a domesticated sub-species of one of these lost crops, erect knotweed (Polygonum erectum) has been described. This paper reports the earliest example of this domesticated sub-species, which was recovered from a sub-mound context at an Adena/Hopewell site in central Kentucky (Walker-Noe, 15Gd56) dating to c. 1 AD. Contemporary Middle Woodland erect knotweed assemblages from habitation sites in western Illinois are not domesticated. A review of the paleoethnobotanical record suggests that farmers on the western front of the Appalachian Mountains developed several innovative agricultural practices, beginning around 1000 BC, that subsequently were adopted across the core area of EAC cultivation. The ethnography and sociology of 20th and 21st century farmer networks suggests that Adena/Hopewell exchange and community integration at mounds and earthworks may have been instrumental to this process. Additional analyses of botanical assemblages from mounds and earthworks, especially morphometric analyses of crop seeds, are necessary to test this hypothesis. The dynamics of social learning involved in this process may also be implicated in the spread of crop varieties and agricultural techniques in other regions.
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
Thousands of years before the maize-based agriculture practiced by many Native American societies... more Thousands of years before the maize-based agriculture practiced by many Native American societies in eastern North America at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
A B S T R A C T Population morphometrics can be employed to explore the process of domestication,... more A B S T R A C T Population morphometrics can be employed to explore the process of domestication, but only after accounting for biases introduced by taphonomic processes and sampling. For every cultivated plant, the challenges associated with carbonization, differential preservation, and sampling bias are different, as are the morphological characteristics of interest in domestication studies. This case study establishes correction factors and sampling parameters for assessing morphological indicators of domestication in erect knotweed (Polygonum erectum L.), an annual plant that was cultivated by Indigenous people in Eastern North America for about 2500 years. Documenting the unique domestication syndrome of erect knotweed creates three different sets of taphonomic and sampling problems that need to be addressed through experimentation and modeling: 1) Assess the morphometric effects of carbonization; 2) assess the effects of differential preservation; and 3) assess the effects of sampling error. The results of this study can be used by other analysts to identify domesticated assemblages of erect knotweed. These analyses also have implications for studies of plant domestication from the morphology of archaeological assemblages in general, especially when nominal variables are used to differentiate wild from domesticated populations (for example, the presence/absence of an abscission scar in cereals or the seed coat texture of chenopods).
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Papers by Natalie Mueller
at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There
are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified
in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into
the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication,
and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for
public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of
re-domesticating these species.
at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There
are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.
at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There
are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified
in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into
the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication,
and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for
public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of
re-domesticating these species.
at the time of contact with Europeans, there existed a unique crop system only known through archaeological evidence. There
are no written or oral records of how these lost crops were cultivated, but several domesticated subspecies have been identified in the archaeological record. Growth experiments and observations of living progenitors of these crops can provide insights into the ancient agricultural system of eastern North America, the role of developmental plasticity in the process of domestication, and the creation and maintenance of diverse landraces under cultivation. In addition, experimental gardens are potent tools for public education, and can also be used to conserve remaining populations of lost crop progenitors and explore the possibility of re-domesticating these species.