David L. Lentz

• Doctor of Philosophy
• Managing Director at University of Cincinnati

For millennia, healing and psychoactive plants have been part of the medicinal and ceremonial fabric of elaborate rituals and everyday religious practices throughout Mesoamerica. Despite the essential nature of these ritual practices to the societal framework of past cultures, a clear understanding of the ceremonial life of the ancient Maya remains...

elemental analyzer (EA) Isotope Ratio Mass Spectrometry was used to measure ∂ ¹³ C values on soil organic matter from reservoirs and depressions at the ancient Maya urban centers of Tikal, Guatemala and Yaxnohcah, Mexico. Variation in δ ¹³ C values on soil organic matter were > −2.0‰, which suggests enrichment from C4 plants including maize, other...

This study aims to provide a technique applied to archaeology to estimate lidar-based aboveground biomass (AGB) in contemporary tropical forests surrounding archaeological sites. Accurate AGB estimations are important to serve as a baseline to evaluate the wood resources that the ancient Maya could have used for the development of their cities. A l...

We would like to thank Neuhäuser and Neuhäuser 1 for their critical review of our paper 2. We presented multi-proxy evidence of an airburst event, which occurred in the Ohio River valley 1699-1567 years ago (252-383 CE). Support for the occurrence of an airburst event includes a disruption in vegetation, meteorites, micrometeorites, and positive an...

Yaxnohcah was a major city of the ancient Maya world, especially during the Preclassic period (1000 BCE–200 CE). Data from excavations provide important insights into the interactions between the ancient inhabitants and its surrounding Neotropical forests, a topic that, as a whole, remains largely enigmatic. This study aspired to fill that void in...

Meteorites, Fe and Si-rich microspherules, positive Ir and Pt anomalies, and burned charcoal-rich Hopewell habitation surfaces demonstrate that a cosmic airburst event occurred over the Ohio River valley during the late Holocene. A comet-shaped earthwork was constructed near the airburst epicenter. Twenty-nine radiocarbon ages establish that the ev...

The Ancestral Puebloans occupied Chaco Canyon, in what is now the southwestern USA, for more than a millennium and harvested useful timber and fuel from the trees of distant for�ests as well as local woodlands, especially juniper and pinyon pine. These pinyon juniper woodland products were an essential part of the resource base from Late Archaic ti...

The Ancestral Puebloans occupied Chaco Canyon, in what is now the southwestern USA, for more than a millennium and harvested useful timber and fuel from the trees of distant forests as well as local woodlands, especially juniper and pinyon pine. These pinyon juniper woodland products were an essential part of the resource base from Late Archaic tim...

Meteorites, silicious vesicular melt glass, Fe and Si-rich magnetic spherules, positive Ir and Pt 25 anomalies, and burned charcoal-rich Hopewell habitation surfaces demonstrate that a cosmic airburst event occurred over the Ohio River valley during the late Holocene. A comet-shaped earthwork was constructed near the airburst epicenter. Twenty-nine...

Tikal, a major city of the ancient Maya world, has been the focus of archaeological research for over a century, yet the interactions between the Maya and the surrounding Neotropical forests remain largely enigmatic. This study aimed to help fill that void by using a powerful new technology, environmental DNA analysis, that enabled us to characteri...

The city of Tikal, a major center of the ancient Maya world, has been the focus of archaeological research for over a century, yet the interactions between the Maya and the surrounding Neotropical forests remain largely enigmatic. To help fill that void, our study used a powerful new technology, environmental DNA analysis, which enabled us to chara...

The Late Classic Maya village of Joya de Cerén's extraordinary preservation caused by the Loma Caldera volcanic eruption around 650 CE allows for a unique opportunity to understand what plant species ancient Mesoamerican farmers utilized in their daily lives for food consumption, medicinal applications, fuel, and construction purposes. While Cerén...

Evidence for the oldest known zeolite water purification filtration system occurs in the undisturbed sediments of the Corriental reservoir at the Maya city of Tikal, in northern Guatemala. The Corriental reservoir was an important source of drinking water at Tikal during the Late Preclassic to Late Classic cultural periods. X-ray diffraction analys...

Understanding civilizations of the past and how they emerge and eventually falter is a primary research focus of archaeological investigations because these provocative data sets offer critical insights into long-term human behavior patterns, especially in regard to land use practices and sustainable environmental interactions. The ancient Maya ser...

The Late Classic Maya village of Joya de Cerén's extraordinary preservation by the Loma Caldera eruption circa 660 CE allows for a unique opportunity to study ancient Mesoamerican landscape management and agricultural practices. Various fruit trees, annual and root crops, fiber producers and other useful plants were cultivated within the village ce...

The Pueblo population of Chaco Canyon during the Bonito Phase (AD 800–1130) employed agricultural strategies and water-management systems to enhance food cultivation in this unpredictable environment. Scepticism concerning the timing and effectiveness of this system, however, remains common. Using optically stimulated luminescence dating of sedimen...

Over the time span of more than a millennium, the ancient Maya polity of Tikal went through periods of growth, reorganization and adaptive cycles of various connected scales. Recent data show that following the reorganization of the Late Preclassic period, Tikal experienced an extended period of technological innovation and population growth that e...

Changes in the global atmospheric budget of platinum reportedly correspond to explosive volcanic eruptions. Using inductively coupled plasma mass spectrometry (ICP-MS) elemental analysis we examined eight widely separated stratified sites to evaluate the geographic extent of three late Holocene high magnitude volcanic events. We found characteristi...

Questions about how archaeological populations obtained basic food supplies are often difficult to answer. The application of specialist techniques from non-archaeological fields typically expands our knowledge base, but can be detrimental to cultural interpretations if employed incorrectly, resulting in problematic datasets and erroneous conclusio...

S1_Supplemental table. Compilation of Chaco Canyon soil salinity data broken out by researcher into separate tabs. All relevant conversions are applied with original equations and sources noted. (XLSX)

S1_Supplemental Notes. Notes related on sample process handling, data interpretation, or relevant but specific details of original publications. (DOCX)

The Classic Maya village of Joya de Cerén is extraordinary in that it was preserved by volcanic ash following the Loma Caldera volcanic eruption. The excellent preservation conditions offer a unique opportunity to understand plants in their primary use contexts, and to examine geospatial relationships between plants - both living and curated - in g...

Many early Maya cities developed along the edges of large structural or karst depressions (bajos). This topographic position aided growing populations to more effectively capture and store rainwater, a necessity for year-round occupation of interior portions of the Maya Lowlands. However, forest clearance on sloping terrain led to accelerated soil...

Micro-flotation, a specific gravity separation technique, was successfully used to remove coal contaminants from radiocarbon samples obtained from profiles, unit excavations, and solid sediment cores in Chaco Canyon, New Mexico, USA. Coal from the Cretaceous Menefee Formation occurs throughout Chaco Canyon in aeolian, alluvial, colluvial, and anthr...

Paleoethnobotanical data retrieved from caches of Late Classic to Early Postclassic origin at the ancient Maya site of Lamanai, Belize, revealed carbonized maize kernels, cob fragments, common beans, coyol endocarps, and an abundance of wood charcoal, from both conifer and hardwood tree species. Pinus caribaea (Caribbean pine) was the most ubiquito...

The ancient Maya community of Lamanai, Belize, is well known for its span of occupation from the Early Preclassic (before 1630 BC) to the present. Although most centers in the central and southern Maya Lowlands were abandoned during the Terminal Classic period (AD 750–1000), ceramic and stratigraphic evidence at Lamanai has shown continuous occupat...

Elemental Analyzer Isotope Ratio Mass Spectrometry was used to determine the δ13C values of common purslane (Portulaca oleracea), a highly edible and nutritious annual succulent and member of the Portulacaceae family, which uses both C4 fixation and Crassulacean acid metabolism (CAM) photosynthesis. The δ13C values for the plant range between − 11....

The intellectual, artistic, and architectural accomplishments of Maya elites during the Classic period were extraordinary, and evidence of elite activities has preserved well in the archaeological record. A centuries-long research focus on elites has understandably fostered the view that they controlled the economy, politics, and religion of Maya c...

Manilkara zapota is a tropical tree species that was used by the ancient Maya in construction of their temples and as a source for fruit. Although this has been supported by ethnographic and paleoethnobotanical data, we used genetic approaches to estimate variation and structure in modern populations of this neotropical tree species to discern if g...

Archaeological investigations at Cerén, a well-preserved Classic period Maya site in El Salvador, have recovered an abundance of carbonized bean remains, both Phaseolus vulgaris and P. lunatus. Surprisingly, the Cerén P. vulgaris bean remains were derived from both wild and domesticated populations. This find reveals that the Late Classic inhabitan...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

The primary theoretical question addressed in this book focuses on the lingering concern of how the ancient Maya in the northern Petén Basin were able to sustain large populations in the midst of a tropical forest environment during the Late Classic period. This book asks how agricultural intensification was achieved and how essential resources, su...

Significance The rise of complex societies and sustainable land use associated with urban centers has been a major focus for anthropologists, geographers, and ecologists. Here we present a quantitative assessment of the agricultural, agroforestry, and water management strategies of the inhabitants of the prominent ancient Maya city of Tikal, and ho...

In this chapter we present the major transitions in Maya history from the Late Preclassic through Terminal Classic periods in the Maya Lowlands, focusing first on major settlement and subsistence systems, followed by major social and environmental costs. We particularly focus on how the Maya built and relied on increasingly complex water and agricu...

Archaeologists have begun to understand that many of the challenges facing our technologically sophisticated, resource dependent, urban systems were also destabilizing factors in ancient complex societies. The focus of IHOPE-Maya is to identify how humans living in the tropical Maya Lowlands in present-day Central America responded to and impacted...

An expanding array of data is becoming available on past climate changes affecting the Maya Lowlands region. We examine the strengths and weaknesses of these data sets, both in terms of identifying general trends and specific events. We then use these data to develop a model based on adaptive cycles that addresses both environmental and cultural ch...

The reasons for the development and collapse of Maya civilization remain controversial and historical events carved on stone monuments throughout this region provide a remarkable source of data about the rise and fall of these complex polities. Use of these records depends on correlating the Maya and European calendars so that they can be compared...

Supplementary PDF

The role of seed crops in the Maya diet is well understood. The role of root crops in the ancient Maya diet has been controversial, with some scholars suggesting they were staples, and others arguing they were not cultivated at all. Research in the 1990s found occasional manioc plants in kitchen gardens within the Classic period Cerén village, lead...

The access to water and the engineered landscapes accommodating its collection and allocation are pivotal issues for assessing sustainability. Recent mapping, sediment coring, and formal excavation at Tikal, Guatemala, have markedly expanded our understanding of ancient Maya water and land use. Among the landscape and engineering feats identified a...

In this paper, we report the results of an analysis of a preserved structure of jute on a ceramic artifact from the site of Harappa that is dated to 2200–1900 (cal.) BC (Fig. 1). Jute cloth has not previously been identified at this early date in the Indus civilization. Since fiber remains are rare in prehistoric South Asia, we briefly review the e...

Aguadas, either natural or human-made ponds, were significant sources of water for the ancient Maya. Aguadas are common features in the Maya Lowlands and make valuable locations for collecting archaeological and paleoenvironmental data. This article discusses research conducted at four aguadas around two adjacent Maya sites, San Bartolo and Xultun...

Morphometric Analysis of Sunflower ( Helianthus annuus L.) Achenes from Mexico and Eastern North America. Sunflower (Helianthus annuus L.) has played a major role in the evolution of agricultural systems in the Americas. The discovery of ancient domesticated remains from archaeological deposits in pre-Columbian Mexico offers new dimensions to widel...

Phylogenetic analyses of genes with demonstrated involvement in evolutionary transitions can be an important means of resolving conflicting hypotheses about evolutionary history or process. In sunflower, two genes have previously been shown to have experienced selective sweeps during its early domestication. In the present study, we identified a th...

Tikal, a major lowland Maya civic-ceremonial center in the heart of the Petén region of Central America, relied heavily on the adjacent lowland rainforest as a resource base for fuel and construction materials. In this study, we analyzed 135 wood samples from timbers used in the construction of all six of the city's major temples as well as two maj...

Until recently, the geographic origin of domesticated sunflower (Helianthus annuus) has been reported as being in the area of southeastern United States of America. The analysis of Mexican historical documents and the recently discovered archaeological “seeds” from Tabasco and Morelos, Mexico, indicate that cultivated sunflower was important in cen...

The distribution of sunflower (Helianthus annuus L.) in Mexico has received renewed interest recently because of the discovery of domesticated H. annuus in early archaeological deposits in Tabasco (ca. 2600 cal. BC) and elsewhere in Mexico. The modern distribution of wild sunflower was ascertained through extensive collecting in Mexico and by exami...

Mexico has long been recognized as one of the world's cradles of domestication with evidence for squash (Cucurbita pepo) cultivation appearing as early as 8,000 cal B.C. followed by many other plants, such as maize (Zea mays), peppers (Capsicum annuum), common beans (Phaseolus vulgaris), and cotton (Gossypium hirsutum). We present archaeological, l...

A group of 44 people from ethnobotany and associated disciplines participated in an Ethnobotanical Summit at the National Tropical Botanical Garden in Kaua‘i on 27-30 January 2007. Considering the grave environmental crisis facing the world today, the loss of biodiversity and the loss of culture, the group decided to issue a statement to stress the...

The recovery of pine (Pinus spp.) charcoal remains from ceremonial contexts at sites in the Maya Lowlands suggests that pine had a significant role in ancient Maya ritual activities. Data collected by the authors reveal that pine remains are a regular component of archaeobotanical assemblages from caves, sites that were used almost exclusively for...

Comparing the source of a commodity with the social levels of the people amongst whom it is found can reveal important aspects of social structure. This case study of a Maya community, using archaeological and ethnographic data, shows that pine and pine charcoal was procured at a distance and distributed unevenly in settlements. The researchers ded...

This study focuses on the use of botanical pesticides in Cajamarca, Peru. Fieldwork was conducted in four Quechua communities located in different ecological zones. Interviews and collection of specimens yielded 64 poisonous species and 22 species considered useful because of their toxic properties. The yellow fever mosquito bioassay was applied to...

Eastern North America is one of at least six regions of the world where agriculture is thought to have arisen wholly independently. The primary evidence for this hypothesis derives from morphological changes in the archaeobotanical record of three important crops--squash, goosefoot and sunflower--as well as an extinct minor cultigen, sumpweed. Howe...

Archaeological research in the Gulf Coast of Tabasco reveals the earliest record of maize cultivation in Mexico. The first farmers settled along beach ridges and lagoons of the Grijalva River delta. Pollen from cultivated Zea appears with evidence of forest clearing about 5100 calendar years B.C. (yr B.C.) [620014C years before the present (yr B.P....

Early remains of Helianthus annuus L. unearthed at the San Andrés site in the Gulf Coast region of Tabasco, Mexico, constitute the earliest record of domesticated sunflower. Accelerator mass spectrometry (AMS) age determinations of a large domesticated seed and achene produced dates of 4130 ± 40 years before the present (B.P.) and 4085 ± 50 B.P., r...

Five dichlorinated 8-quinolinols (2,5- 5,6-, 3,5-, 3,7-, and 4,5-dichloro-8-quinolinol) were tested against Candida albicans and C. tropicalis in Sabouraud dextrose broth with and without bovine serum. The 5,6-, 3,5-, and 3,7-dichloro-8-quinolinols proved to be more effective than the control, 5-fluorocytosine. In cytotoxicity tests employing baby...

Ninety-two plants used in the traditional pharmacopoeia of the Pech and neighboring Mestizo peoples of central Honduras are reported. The results of in vitro antimicrobial screens showed that 19 of the extracts from medicinal plants revealed signs of antifungal activity while 22 demonstrated a measurable inhibitory effect on one or more bacterial c...

An ethanol extract of the leaves of Piper aduncum demonstrated good antimicrobial activity. Bioassay-directed fractionation of this extract led to the isolation of 4-methoxy-3,5-bis(3′-methylbenzoic acid) 1, 2,6-dihydroxy-4-methoxy-chalcone 2, nervogenic acid 3 and 2,2-dimethoxy-8-(3-methyl-2-butenyl)-2H-chromene-6-carboxylic acid 4. These compound...

Analysis of paleoethnobotanical remains from the Yaramela site in central Honduras has provided insights into subsistence activities, resource-extraction preferences from surrounding ecological zones, and the transfer of plant materials through interregional exchange networks during the Formative and Late Classic periods. Remains of maize (Zea mays...

Wetland research in northern Belize provides the earliest evidence for development of agriculture in the Maya Lowlands. Pollen data confirm the introduction of maize and manioc before 3000 B.C. Dramatic deforestation, beginning ca. 2500 B.C. and intensifying in wetland environments ca. 1500-1300 B.C., marks an expansion of agriculture, which occurr...

Paleoethnobotanical studies in the Zapotitdn Valley of north-central El Salvador revealed that a species of grass, Trachypogon plumosus, was in common use as a thatch material at the Ceren site, a small mesoamerican farming community inundated by volcanic ash circa a.d. 590. Although the grass must have been common in Precolumbian times, repeated a...

Botanical remains found in ceramic vessels and other containers at the Cerén site, El Salvador, provide evidence for how plants were used by Classic-period inhabitants. Because of the rapid inundation of ash caused by the eruption of the Loma Caldera volcano sometime around A. D. 590, conditions for the preservation of plant parts at Cerén are supe...

The New York Botanical Garden initiated its Graduate Studies Program through a cooperative agreement with Columbia University in 1896. This arrangement continued until the late 1960s, when the Biology Department at Columbia chose to emphasize laboratory-related research and discontinued its organismal programs. At the time a new partnership was for...