James R Ehleringer
Datos Biográficos
| ID | 101346 |
|---|---|
| NOMBRE | James R Ehleringer |
| NOMBRES | James R |
| APELLIDO | Ehleringer |
| FIRMA | EHLERINGER J R |
| AFILIACIONES | University of Utah |
| ORCID | 0000-0003-2050-3636 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 20 |
| TOTAL DE CITAS | 262 |
| TOTAL COMO AUTOR | 18 |
| TOTAL COMO EDITOR | 2 |
| PRIMER AÑO DE PUBLICACIÓN | 1989 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2018 |
| ÍNDICE H | 7 |
Evaluation of childhood nutrition by dietary survey and stable isotope analyses of hair and breath
Objectives The natural abundances of carbon, nitrogen, and sulfur stable isotopes in hair, and of carbon isotopes in breath serve as quantitative biomarkers of protein and carbohydrate sources, but applicability of isotopes for evaluating children's diet has not been demonstrated. In this study, we sought to describe the stable isotope patterns observed in the hair and breath of children and to assess dietary variations in relation to age and eth…
Stable isotopes (carbon, nitrogen, sulfur), diet, and anthropometry in urban Colombian women
OBJECTIVES: We conducted stable isotope and dietary analyses of women from higher and lower socioeconomic status (SES) groups in Cali, Colombia. The objectives were to test between-group differences in stable isotope, dietary, and anthropometric characteristics, and to evaluate relationships between diet and stable isotope values. METHODS: Hair samples from 38 women (mean age 33.4) from higher and lower SES groups were analyzed for δ(13) C, δ(15)…
Hydrogen and Oxygen Isotope Ratios in Body Water and Hair
The stable isotopic composition of drinking water, diet, and atmospheric oxygen influence the isotopic composition of body water ( 2 H / 1 H , 18 O / 16 O expressed as δ 2 H and δ 18 O ). In turn, body water influences the isotopic composition of organic matter in tissues, such as hair and teeth, which are often used to reconstruct historical dietary and movement patterns of animals and humans. Here, we used a nonhuman primate system ( M acaca fa…
C Calibration Curves for Modern Plant Material from Tropical Regions of South America
Two Δ 14 C calibration curves have been produced that allow determination of the statistical average age of coca leaf and cocaine base specimens produced for the time period 1979–2009. These calibration curves are based on field collections of specimens in Bolivia, Colombia, Ecuador, and Peru. The coca leaf F 14 C and Δ 14 C calibration curves can be used to predict the ages of botanical tissues collected in tropical South America and possibly ex…
Tracing retail cannabis in the United States
Stable isotope analysis of modern human hair collected from Asia (China, India, Mongolia, and Pakistan)
We report isotopic data (δ 2 H, δ 18 O n = 196; δ 13 C, δ 15 N n = 142; δ 34 S n = 85) from human hair and drinking water (δ 2 H, δ 18 O n = 67) collected across China, India, Mongolia, and Pakistan. Hair isotope ratios reflected the large environmental isotopic gradients and dietary differences. Geographic information was recorded in H and O and to a lesser extent, S isotopes. H and O data were entered into a recently developed model describing …
Dietary and physiological controls on the hydrogen and oxygen isotope ratios of hair from mid‐20th century indigenous populations
A semimechanistic model has recently been proposed to explain observed correlations between the H and O isotopic composition of hair from modern residents of the USA and the isotopic composition of drinking water, but the applicability of this model to hair from non‐USA and preglobalization populations is unknown. Here we test the model against data from hair samples collected during the 1930s–1950s from populations of five continents. Although C…
Turnover of oxygen and hydrogen isotopes in the body water, CO2, hair, and enamel of a small mammal
Sensitivity of the Colorado Plateau to Change
Schwinning, S., J. Belnap, D. R. Bowling, and J. R. Ehleringer. 2008. Sensitivity of the Colorado Plateau to change: climate, ecosystems, and society. Ecology and Society 13(2): 28. https://doi.org/10.5751/ES-02412-130228
A stable isotope aridity index for terrestrial environments
We use the oxygen isotopic composition of tooth enamel from multiple mammalian taxa across eastern Africa to present a proxy for aridity. Here we report tooth enamel δ 18 O values of 14 species from 18 locations and classify them according to their isotopic sensitivity to environmental aridity. The species are placed into two groups, evaporation sensitive (ES) and evaporation insensitive (EI). Tooth enamel δ 18 O values of ES animals increase wit…
Geographical patterns of human diet derived from stable-isotope analysis of fingernails
Carbon and nitrogen isotope ratios of human fingernails were measured in 490 individuals in the western US and 273 individuals in southeastern Brazil living in urban areas, and 53 individuals living in a moderately isolated area in the central Amazon region of Brazil and consuming mostly locally grown foods. In addition, we measured the carbon and nitrogen isotope ratios of common food items to assess the extent to which these isotopic signatures…
A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems
A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems (Ecological Studies)
"With an understanding of the history and dynamics of the biosphere, the authors address the future role of atmospheric CO[subscript 2] and its likely effects on ecosystems. This book incorporates the advances of various earth-science, environmental, and ecological fields into an overall account of global change and the changing dynamics of life on Earth."--BOOK JACKET.
Carbon isotope fractionation between diet, breath CO2, and bioapatite in different mammals
Oxygen isotopes in cellulose identify source water for archaeological maize in the American Southwest
An experimental study of nitrogen flux in llamas
Nitrogen isotopes in mammalian herbivores
Nitrogen isotope analysis is a common technique for investigating dietary behaviour in modern and archaeological populations. One of its primary uses is to provide trophic level information. This application is possible because of a ∼3‰ enrichment in15N along each step in the food chain, resulting in carnivores having higher δ15N values than herbivores, which in turn have higher δ15N values than plants. Much variation has also been observed withi…
Global vegetation change through the Miocene/Pliocene boundary
C 4 photosynthesis, atmospheric CO 2 , and climate
Carbon Isotope Discrimination and Photosynthesis
We discuss the physical and enzymatic bases of carbone isotope discrimination during photosynthesis, noting how knowledge of discrimination can be used to provide additional insight into photosynthetic metabolism and the environmental influences on that process
Carbon isotope fractionation between diet, breath CO2, and bioapatite in different mammals
Nitrogen isotopes in mammalian herbivores
Nitrogen isotope analysis is a common technique for investigating dietary behaviour in modern and archaeological populations. One of its primary uses is to provide trophic level information. This application is possible because of a ∼3‰ enrichment in15N along each step in the food chain, resulting in carnivores having higher δ15N values than herbivores, which in turn have higher δ15N values than plants. Much variation has also been observed withi…
An experimental study of nitrogen flux in llamas
Geographical patterns of human diet derived from stable-isotope analysis of fingernails
Carbon and nitrogen isotope ratios of human fingernails were measured in 490 individuals in the western US and 273 individuals in southeastern Brazil living in urban areas, and 53 individuals living in a moderately isolated area in the central Amazon region of Brazil and consuming mostly locally grown foods. In addition, we measured the carbon and nitrogen isotope ratios of common food items to assess the extent to which these isotopic signatures…
Dietary and physiological controls on the hydrogen and oxygen isotope ratios of hair from mid‐20th century indigenous populations
A semimechanistic model has recently been proposed to explain observed correlations between the H and O isotopic composition of hair from modern residents of the USA and the isotopic composition of drinking water, but the applicability of this model to hair from non‐USA and preglobalization populations is unknown. Here we test the model against data from hair samples collected during the 1930s–1950s from populations of five continents. Although C…
Stable isotope analysis of modern human hair collected from Asia (China, India, Mongolia, and Pakistan)
We report isotopic data (δ 2 H, δ 18 O n = 196; δ 13 C, δ 15 N n = 142; δ 34 S n = 85) from human hair and drinking water (δ 2 H, δ 18 O n = 67) collected across China, India, Mongolia, and Pakistan. Hair isotope ratios reflected the large environmental isotopic gradients and dietary differences. Geographic information was recorded in H and O and to a lesser extent, S isotopes. H and O data were entered into a recently developed model describing …
Oxygen isotopes in cellulose identify source water for archaeological maize in the American Southwest
C Calibration Curves for Modern Plant Material from Tropical Regions of South America
Two Δ 14 C calibration curves have been produced that allow determination of the statistical average age of coca leaf and cocaine base specimens produced for the time period 1979–2009. These calibration curves are based on field collections of specimens in Bolivia, Colombia, Ecuador, and Peru. The coca leaf F 14 C and Δ 14 C calibration curves can be used to predict the ages of botanical tissues collected in tropical South America and possibly ex…
Sensitivity of the Colorado Plateau to Change
Schwinning, S., J. Belnap, D. R. Bowling, and J. R. Ehleringer. 2008. Sensitivity of the Colorado Plateau to change: climate, ecosystems, and society. Ecology and Society 13(2): 28. https://doi.org/10.5751/ES-02412-130228
Carbon Isotope Discrimination and Photosynthesis
We discuss the physical and enzymatic bases of carbone isotope discrimination during photosynthesis, noting how knowledge of discrimination can be used to provide additional insight into photosynthetic metabolism and the environmental influences on that process
Global vegetation change through the Miocene/Pliocene boundary
C 4 photosynthesis, atmospheric CO 2 , and climate
An experimental study of nitrogen flux in llamas
Nitrogen isotopes in mammalian herbivores
Nitrogen isotope analysis is a common technique for investigating dietary behaviour in modern and archaeological populations. One of its primary uses is to provide trophic level information. This application is possible because of a ∼3‰ enrichment in15N along each step in the food chain, resulting in carnivores having higher δ15N values than herbivores, which in turn have higher δ15N values than plants. Much variation has also been observed withi…
A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems
A History of Atmospheric CO2 and Its Effects on Plants, Animals, and Ecosystems (Ecological Studies)
"With an understanding of the history and dynamics of the biosphere, the authors address the future role of atmospheric CO[subscript 2] and its likely effects on ecosystems. This book incorporates the advances of various earth-science, environmental, and ecological fields into an overall account of global change and the changing dynamics of life on Earth."--BOOK JACKET.
Carbon isotope fractionation between diet, breath CO2, and bioapatite in different mammals
Oxygen isotopes in cellulose identify source water for archaeological maize in the American Southwest
A stable isotope aridity index for terrestrial environments
We use the oxygen isotopic composition of tooth enamel from multiple mammalian taxa across eastern Africa to present a proxy for aridity. Here we report tooth enamel δ 18 O values of 14 species from 18 locations and classify them according to their isotopic sensitivity to environmental aridity. The species are placed into two groups, evaporation sensitive (ES) and evaporation insensitive (EI). Tooth enamel δ 18 O values of ES animals increase wit…
Geographical patterns of human diet derived from stable-isotope analysis of fingernails
Carbon and nitrogen isotope ratios of human fingernails were measured in 490 individuals in the western US and 273 individuals in southeastern Brazil living in urban areas, and 53 individuals living in a moderately isolated area in the central Amazon region of Brazil and consuming mostly locally grown foods. In addition, we measured the carbon and nitrogen isotope ratios of common food items to assess the extent to which these isotopic signatures…
Turnover of oxygen and hydrogen isotopes in the body water, CO2, hair, and enamel of a small mammal
Sensitivity of the Colorado Plateau to Change
Schwinning, S., J. Belnap, D. R. Bowling, and J. R. Ehleringer. 2008. Sensitivity of the Colorado Plateau to change: climate, ecosystems, and society. Ecology and Society 13(2): 28. https://doi.org/10.5751/ES-02412-130228
Dietary and physiological controls on the hydrogen and oxygen isotope ratios of hair from mid‐20th century indigenous populations
A semimechanistic model has recently been proposed to explain observed correlations between the H and O isotopic composition of hair from modern residents of the USA and the isotopic composition of drinking water, but the applicability of this model to hair from non‐USA and preglobalization populations is unknown. Here we test the model against data from hair samples collected during the 1930s–1950s from populations of five continents. Although C…
Tracing retail cannabis in the United States
Stable isotope analysis of modern human hair collected from Asia (China, India, Mongolia, and Pakistan)
We report isotopic data (δ 2 H, δ 18 O n = 196; δ 13 C, δ 15 N n = 142; δ 34 S n = 85) from human hair and drinking water (δ 2 H, δ 18 O n = 67) collected across China, India, Mongolia, and Pakistan. Hair isotope ratios reflected the large environmental isotopic gradients and dietary differences. Geographic information was recorded in H and O and to a lesser extent, S isotopes. H and O data were entered into a recently developed model describing …
C Calibration Curves for Modern Plant Material from Tropical Regions of South America
Two Δ 14 C calibration curves have been produced that allow determination of the statistical average age of coca leaf and cocaine base specimens produced for the time period 1979–2009. These calibration curves are based on field collections of specimens in Bolivia, Colombia, Ecuador, and Peru. The coca leaf F 14 C and Δ 14 C calibration curves can be used to predict the ages of botanical tissues collected in tropical South America and possibly ex…
Hydrogen and Oxygen Isotope Ratios in Body Water and Hair
The stable isotopic composition of drinking water, diet, and atmospheric oxygen influence the isotopic composition of body water ( 2 H / 1 H , 18 O / 16 O expressed as δ 2 H and δ 18 O ). In turn, body water influences the isotopic composition of organic matter in tissues, such as hair and teeth, which are often used to reconstruct historical dietary and movement patterns of animals and humans. Here, we used a nonhuman primate system ( M acaca fa…
Stable isotopes (carbon, nitrogen, sulfur), diet, and anthropometry in urban Colombian women
OBJECTIVES: We conducted stable isotope and dietary analyses of women from higher and lower socioeconomic status (SES) groups in Cali, Colombia. The objectives were to test between-group differences in stable isotope, dietary, and anthropometric characteristics, and to evaluate relationships between diet and stable isotope values. METHODS: Hair samples from 38 women (mean age 33.4) from higher and lower SES groups were analyzed for δ(13) C, δ(15)…
Evaluation of childhood nutrition by dietary survey and stable isotope analyses of hair and breath
Objectives The natural abundances of carbon, nitrogen, and sulfur stable isotopes in hair, and of carbon isotopes in breath serve as quantitative biomarkers of protein and carbohydrate sources, but applicability of isotopes for evaluating children's diet has not been demonstrated. In this study, we sought to describe the stable isotope patterns observed in the hair and breath of children and to assess dietary variations in relation to age and eth…
Biology (16 obras) · Chemistry (11 obras) · Isotope Analysis in Ecology (11 obras) · Stable isotope ratio (10 obras) · Ecology (9 obras) · Environmental Science (9 obras) · Geography (9 obras) · Isotope (9 obras) · Archaeology and ancient environmental studies (8 obras) · Ecology (8 obras)