Crystal N H Mcmichael
Datos Biográficos
| ID | 1746766 |
|---|---|
| NOMBRE | Crystal N H Mcmichael |
| NOMBRES | Crystal N H |
| APELLIDO | Mcmichael |
| FIRMA | MCMICHAEL C N H |
| AFILIACIONES | University of Amsterdam |
| ORCID | 0000-0002-1064-1499 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 19 |
| TOTAL DE CITAS | 163 |
| TOTAL COMO AUTOR | 19 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2011 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2026 |
| ÍNDICE H | 5 |
The legacy of post-Columbian disturbance in shaping a northwestern Amazonian forest
The ecological legacies of past human activity in modern Amazonian forests remain debated. Paleoecology helps provide long-term insights into land management practices and their ecological consequences. We analyzed fossil pollen, charcoal, phytoliths, and sediment chemistry from Añangucocha, a lake in Ecuadorian Amazonia, identifying six distinct phases of cultural use over the last 1120 years. All past cultural uses influenced vegetation composi…
Pre-Columbian vegetational and fire history in western Amazonia
Heat, hydroclimate and herbivory
Late-Holocene maize cultivation, fire, and forest change at Lake Ayauch i , Amazonian Ecuador
A high-resolution paleoecological record provides a 2690 year-long fossil pollen and charcoal history from Lake Ayauch i , Ecuador, in lowland Amazonia. The record begins with a landscape that is already partially deforested and in which maize is being grown. Dated charcoal fragments from local soils coincide with fire events and peaks of land clearance seen in the lake sediment record. After c. AD 550 grass pollen becomes less abundant, as a bro…
Phytoliths in modern plants from Amazonia and the Neotropics at large
Phytolith assemblages reflect variability in human land use and the modern environment
Phytoliths preserved in soils and sediments can be used to provide unique insights into past vegetation dynamics in response to human and climate change. Phytoliths can reconstruct local vegetation in terrestrial soils where pollen grains typically decay, providing a range of markers (or lack thereof) that document past human activities. The ca. 6 million km 2 of Amazonian forests have relatively few baseline datasets documenting changes in phyto…
Past human-induced ecological legacies as a driver of modern Amazonian resilience
People have modified landscapes throughout the Holocene (the last c . 11,700 years) by modifying soils, burning forests, cultivating and domesticating plants, and directly and indirectly enriched and depleted plant abundances. These activities also took place in Amazonia, which is the largest contiguous piece of rainforest in the world, and for many decades was considered to have very little human impact until the modern era. The compositional sh…
People have shaped most of terrestrial nature for at least 12,000 years
Significance The current biodiversity crisis is often depicted as a struggle to preserve untouched habitats. Here, we combine global maps of human populations and land use over the past 12,000 y with current biodiversity data to show that nearly three quarters of terrestrial nature has long been shaped by diverse histories of human habitation and use by Indigenous and traditional peoples. With rare exceptions, current biodiversity losses are caus…
Phytoliths in modern plants from amazonia and the neotropics at large
Spatiotemporal patterns of pre-Columbian people in Amazonia
A current goal among many scientific disciplines is to incorporate data on past human land use and climate change into current global climate and vegetation models. Here, we used existing archaeological and paleoecological data to provide a spatiotemporal reconstruction of human history in Greater Amazonia over the Holocene. We used an ensemble distribution model based on a database of georeferenced 14 C-dated material and environmental factors t…
Four centuries of vegetation change in the mid-elevation Andean forests of Ecuador
Mid-elevation Andean ecosystems have immense species richness and endemism. Taxonomic composition is known to change through time on the eastern slopes of the Andes as a result of climatic change and disturbance events, both natural and by human actions. Fossil phytoliths can capture local scale vegetation changes, especially among monocotyledonous plants. Phytolith production is high in grasses and palms, plant groups that are particularly sensi…
Finding forest management in prehistoric Amazonia
Forest stability during the early and late Holocene in the igapó floodplains of the Rio Negro, northwestern Brazil
Located at the northwestern part of the Amazon basin, Rio Negro is the largest black-water river in the world and is one of the poorest studied regions of the Amazon lowlands. In the middle-upper part of the Rio Negro were retrieved sediment cores form Lake Acarabixi, which were analyzed using pollen, spores, charcoal, and geochemistry. The aim of this study was to detect the influences from humans and river dynamics on the vegetation history in …
A multidisciplinary study of a Late Pleistocene arctic ground squirrel ( Urocitellus parryii ) midden from Yukon, Canada
Middens (nests and caches) of Late Pleistocene arctic ground squirrels ( Urocitellus parryii ) that are preserved in the permafrost of Beringia archive valuable paleoecological data. Arctic ground squirrels selectively include the plant material placed in middens. To account for this selectivity bias, we used a multi-proxy approach that includes ancient DNA (aDNA) and macro- and microfossil analyses. Here, we provide insight into Pleistocene vege…
Columbus' footprint in Hispaniola
Amazonia and the Anthropocene
The nature and spatial scale of prehistoric human landscape modifications in Amazonia are enduring questions. Original conceptions of the issues by archaeologists published more than 40 years ago posited little human influence because of putative environmental constraints. Empirical data accumulated more recently demonstrated dense, permanent settlements along major watercourses of the central and southern Amazon, and profound landscape alteratio…
Moderate-Resolution Remote Sensing and Geospatial Analyses of Microclimates, Mounds, and Maize in the Northern Great Lakes
Remote sensing applications are increasingly common in archaeology but they often focus on high resolution imagery and direct archaeological site detection. Moderate spatial resolution remote sensing instruments, which have (near) daily repeat intervals, but contain less detailed spectral and spatial information, have been employed much less frequently in archaeology. However, moderate remote sensing data offer distinct advantages for archaeologi…
Sparse Pre-Columbian Human Habitation in Western Amazonia
Population Limits Extensive pre-Columbian populations inhabited the central and eastern Amazon basin, as evidenced by the clearing and modification of forests. McMichael et al. (p. 1429 ) examined how far inland such activities may have extended by sampling soils across western Amazonia, including river bluffs, which were heavily occupied downstream. Little evidence of human disturbance across a wide region was found by looking for charcoal layer…
Spatial and temporal scales of pre-Columbian disturbance associated with western Amazonian lakes
The history of landscape alteration in Amazonia by humans prior to the arrival of Europeans remains poorly understood. Estimates of human population size at the time of European contact vary by several million, and the trajectories of cultural and agricultural development are equally uncertain. The extent to which human populations altered Amazonian ecosystems is a function of population size, land management style, radius of influence of each su…
Amazonia and the Anthropocene
The nature and spatial scale of prehistoric human landscape modifications in Amazonia are enduring questions. Original conceptions of the issues by archaeologists published more than 40 years ago posited little human influence because of putative environmental constraints. Empirical data accumulated more recently demonstrated dense, permanent settlements along major watercourses of the central and southern Amazon, and profound landscape alteratio…
Spatial and temporal scales of pre-Columbian disturbance associated with western Amazonian lakes
The history of landscape alteration in Amazonia by humans prior to the arrival of Europeans remains poorly understood. Estimates of human population size at the time of European contact vary by several million, and the trajectories of cultural and agricultural development are equally uncertain. The extent to which human populations altered Amazonian ecosystems is a function of population size, land management style, radius of influence of each su…
Finding forest management in prehistoric Amazonia
Columbus' footprint in Hispaniola
Phytoliths in modern plants from amazonia and the neotropics at large
Past human-induced ecological legacies as a driver of modern Amazonian resilience
People have modified landscapes throughout the Holocene (the last c . 11,700 years) by modifying soils, burning forests, cultivating and domesticating plants, and directly and indirectly enriched and depleted plant abundances. These activities also took place in Amazonia, which is the largest contiguous piece of rainforest in the world, and for many decades was considered to have very little human impact until the modern era. The compositional sh…
Late-Holocene maize cultivation, fire, and forest change at Lake Ayauch i , Amazonian Ecuador
A high-resolution paleoecological record provides a 2690 year-long fossil pollen and charcoal history from Lake Ayauch i , Ecuador, in lowland Amazonia. The record begins with a landscape that is already partially deforested and in which maize is being grown. Dated charcoal fragments from local soils coincide with fire events and peaks of land clearance seen in the lake sediment record. After c. AD 550 grass pollen becomes less abundant, as a bro…
Moderate-Resolution Remote Sensing and Geospatial Analyses of Microclimates, Mounds, and Maize in the Northern Great Lakes
Remote sensing applications are increasingly common in archaeology but they often focus on high resolution imagery and direct archaeological site detection. Moderate spatial resolution remote sensing instruments, which have (near) daily repeat intervals, but contain less detailed spectral and spatial information, have been employed much less frequently in archaeology. However, moderate remote sensing data offer distinct advantages for archaeologi…
Phytoliths in modern plants from Amazonia and the Neotropics at large
Phytolith assemblages reflect variability in human land use and the modern environment
Phytoliths preserved in soils and sediments can be used to provide unique insights into past vegetation dynamics in response to human and climate change. Phytoliths can reconstruct local vegetation in terrestrial soils where pollen grains typically decay, providing a range of markers (or lack thereof) that document past human activities. The ca. 6 million km 2 of Amazonian forests have relatively few baseline datasets documenting changes in phyto…
Spatial and temporal scales of pre-Columbian disturbance associated with western Amazonian lakes
The history of landscape alteration in Amazonia by humans prior to the arrival of Europeans remains poorly understood. Estimates of human population size at the time of European contact vary by several million, and the trajectories of cultural and agricultural development are equally uncertain. The extent to which human populations altered Amazonian ecosystems is a function of population size, land management style, radius of influence of each su…
Sparse Pre-Columbian Human Habitation in Western Amazonia
Population Limits Extensive pre-Columbian populations inhabited the central and eastern Amazon basin, as evidenced by the clearing and modification of forests. McMichael et al. (p. 1429 ) examined how far inland such activities may have extended by sampling soils across western Amazonia, including river bluffs, which were heavily occupied downstream. Little evidence of human disturbance across a wide region was found by looking for charcoal layer…
Moderate-Resolution Remote Sensing and Geospatial Analyses of Microclimates, Mounds, and Maize in the Northern Great Lakes
Remote sensing applications are increasingly common in archaeology but they often focus on high resolution imagery and direct archaeological site detection. Moderate spatial resolution remote sensing instruments, which have (near) daily repeat intervals, but contain less detailed spectral and spatial information, have been employed much less frequently in archaeology. However, moderate remote sensing data offer distinct advantages for archaeologi…
Amazonia and the Anthropocene
The nature and spatial scale of prehistoric human landscape modifications in Amazonia are enduring questions. Original conceptions of the issues by archaeologists published more than 40 years ago posited little human influence because of putative environmental constraints. Empirical data accumulated more recently demonstrated dense, permanent settlements along major watercourses of the central and southern Amazon, and profound landscape alteratio…
Forest stability during the early and late Holocene in the igapó floodplains of the Rio Negro, northwestern Brazil
Located at the northwestern part of the Amazon basin, Rio Negro is the largest black-water river in the world and is one of the poorest studied regions of the Amazon lowlands. In the middle-upper part of the Rio Negro were retrieved sediment cores form Lake Acarabixi, which were analyzed using pollen, spores, charcoal, and geochemistry. The aim of this study was to detect the influences from humans and river dynamics on the vegetation history in …
A multidisciplinary study of a Late Pleistocene arctic ground squirrel ( Urocitellus parryii ) midden from Yukon, Canada
Middens (nests and caches) of Late Pleistocene arctic ground squirrels ( Urocitellus parryii ) that are preserved in the permafrost of Beringia archive valuable paleoecological data. Arctic ground squirrels selectively include the plant material placed in middens. To account for this selectivity bias, we used a multi-proxy approach that includes ancient DNA (aDNA) and macro- and microfossil analyses. Here, we provide insight into Pleistocene vege…
Columbus' footprint in Hispaniola
Spatiotemporal patterns of pre-Columbian people in Amazonia
A current goal among many scientific disciplines is to incorporate data on past human land use and climate change into current global climate and vegetation models. Here, we used existing archaeological and paleoecological data to provide a spatiotemporal reconstruction of human history in Greater Amazonia over the Holocene. We used an ensemble distribution model based on a database of georeferenced 14 C-dated material and environmental factors t…
Four centuries of vegetation change in the mid-elevation Andean forests of Ecuador
Mid-elevation Andean ecosystems have immense species richness and endemism. Taxonomic composition is known to change through time on the eastern slopes of the Andes as a result of climatic change and disturbance events, both natural and by human actions. Fossil phytoliths can capture local scale vegetation changes, especially among monocotyledonous plants. Phytolith production is high in grasses and palms, plant groups that are particularly sensi…
Finding forest management in prehistoric Amazonia
Phytoliths in modern plants from amazonia and the neotropics at large
People have shaped most of terrestrial nature for at least 12,000 years
Significance The current biodiversity crisis is often depicted as a struggle to preserve untouched habitats. Here, we combine global maps of human populations and land use over the past 12,000 y with current biodiversity data to show that nearly three quarters of terrestrial nature has long been shaped by diverse histories of human habitation and use by Indigenous and traditional peoples. With rare exceptions, current biodiversity losses are caus…
Late-Holocene maize cultivation, fire, and forest change at Lake Ayauch i , Amazonian Ecuador
A high-resolution paleoecological record provides a 2690 year-long fossil pollen and charcoal history from Lake Ayauch i , Ecuador, in lowland Amazonia. The record begins with a landscape that is already partially deforested and in which maize is being grown. Dated charcoal fragments from local soils coincide with fire events and peaks of land clearance seen in the lake sediment record. After c. AD 550 grass pollen becomes less abundant, as a bro…
Phytoliths in modern plants from Amazonia and the Neotropics at large
Phytolith assemblages reflect variability in human land use and the modern environment
Phytoliths preserved in soils and sediments can be used to provide unique insights into past vegetation dynamics in response to human and climate change. Phytoliths can reconstruct local vegetation in terrestrial soils where pollen grains typically decay, providing a range of markers (or lack thereof) that document past human activities. The ca. 6 million km 2 of Amazonian forests have relatively few baseline datasets documenting changes in phyto…
Past human-induced ecological legacies as a driver of modern Amazonian resilience
People have modified landscapes throughout the Holocene (the last c . 11,700 years) by modifying soils, burning forests, cultivating and domesticating plants, and directly and indirectly enriched and depleted plant abundances. These activities also took place in Amazonia, which is the largest contiguous piece of rainforest in the world, and for many decades was considered to have very little human impact until the modern era. The compositional sh…
Pre-Columbian vegetational and fire history in western Amazonia
Heat, hydroclimate and herbivory
The legacy of post-Columbian disturbance in shaping a northwestern Amazonian forest
The ecological legacies of past human activity in modern Amazonian forests remain debated. Paleoecology helps provide long-term insights into land management practices and their ecological consequences. We analyzed fossil pollen, charcoal, phytoliths, and sediment chemistry from Añangucocha, a lake in Ecuadorian Amazonia, identifying six distinct phases of cultural use over the last 1120 years. All past cultural uses influenced vegetation composi…
Geography (17 obras) · Amazonian Archaeology and Ethnohistory (14 obras) · Biology (12 obras) · Ecology (12 obras) · Amazon rainforest (11 obras) · Archaeology (10 obras) · Physical geography (9 obras) · Amazonian (8 obras) · Vegetation (pathology (8 obras) · Cassava research and cyanide (7 obras)