Daniel B. Nelson
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View article: Rethinking the <scp> <sup>2</sup> H </scp> fingerprint of carbohydrates: a novel proxy for plant metabolism and performance
Rethinking the <span> <sup>2</sup> H </span> fingerprint of carbohydrates: a novel proxy for plant metabolism and performance Open
Summary The intricate architecture of plant metabolic networks and the dynamic fluxes of elements through these networks are fundamental determinants of how carbon (C) is partitioned among growth, reproduction, storage, respiration and the…
View article: An Efficient Solid Phase Extraction Method for Purification and Analysis of Compound‐Specific Plant Sugar Stable Hydrogen Isotope Values
An Efficient Solid Phase Extraction Method for Purification and Analysis of Compound‐Specific Plant Sugar Stable Hydrogen Isotope Values Open
Rationale The stable hydrogen isotope composition ( δ 2 H) of plant compounds can serve as environmental or metabolic proxies, but interpretations are hindered by insufficient mechanistic understanding. This can be improved by analyzing th…
View article: Holocene sea ice and paleoenvironment conditions in the Beaufort Sea (Canadian Arctic) reconstructed with lipid biomarkers
Holocene sea ice and paleoenvironment conditions in the Beaufort Sea (Canadian Arctic) reconstructed with lipid biomarkers Open
The Beaufort Sea region in the Canadian Arctic has undergone substantial sea ice loss in recent decades, primarily driven by anthropogenic climate warming. To place these changes within the context of natural climate variability, Holocene …
View article: Human–climate–environment interactions in Espiritu Santo, Vanuatu during the past millennium
Human–climate–environment interactions in Espiritu Santo, Vanuatu during the past millennium Open
Over the past millennium, the tropical Pacific Islands of Remote Oceania have experienced significant transformations caused by different waves of human settlement and climatic variability. However, many sites remain to be explored for the…
View article: Comparing Dual Water Equilibration Methods for Hydrogen Stable Isotope Analysis of Plant Carbohydrates and Proteinaceous Animal Samples
Comparing Dual Water Equilibration Methods for Hydrogen Stable Isotope Analysis of Plant Carbohydrates and Proteinaceous Animal Samples Open
Rationale The hydrogen stable isotope composition ( δ 2 H) of organic samples carries information about processes including hydrology, climate, ecology, and plant metabolism. Numerous methods exist to control for hydrogen in organic sample…
View article: Critical below-ground drought effects on temperate trees – insights from six years of ecophysiological monitoring and two years of rain exclusion
Critical below-ground drought effects on temperate trees – insights from six years of ecophysiological monitoring and two years of rain exclusion Open
Climate change, including a reduction in precipitation, increased atmospheric moisture demand, and drying soils, threaten the life-supporting function in trees. In response, trees can exhibit different below-ground drought acclimation stra…
View article: Opposing seasonal trends in source water and sugar dampen intra‐annual variability in tree rings oxygen isotopes
Opposing seasonal trends in source water and sugar dampen intra‐annual variability in tree rings oxygen isotopes Open
Summary Variations of oxygen isotopes δ 18 O in tree rings provide critical insights into past climate and tree physiological processes, yet the mechanisms shaping the intra‐annual δ 18 O signals remain incompletely understood. To address …
View article: Precipitation Isotopes New Zealand (PINZ): improvements in precipitation isoscapes with machine learning
Precipitation Isotopes New Zealand (PINZ): improvements in precipitation isoscapes with machine learning Open
Environmental context Stable water isotopes δ18O and δ2H in atmospheric precipitation are valuable hydrologic tracers with varied applications, but measuring them over large scales is impractical. Precipitation isotope models (isoscapes) a…
View article: Nocturnal sucrose does not reflect the hydrogen isotope composition of transitory starch in leaves as expected
Nocturnal sucrose does not reflect the hydrogen isotope composition of transitory starch in leaves as expected Open
The hydrogen isotope composition ( δ 2 H) of cellulose is inherently linked to that of sucrose synthesized in leaves. Daytime sucrose is synthesized from triose phosphates produced by the Calvin‐Benson‐Bassham cycle, while nighttime sucros…
View article: Persistent effect of ancient Romans on algal community in Murtensee (Switzerland)
Persistent effect of ancient Romans on algal community in Murtensee (Switzerland) Open
Throughout recent decades, cultural eutrophication has threatened freshwater ecosystem functioning. However, anthropogenic activity has also heavily impacted aquatic environments earlier in human history. During the 2nd century BCE Aventic…
View article: Opposing seasonal trends in source water and sugar dampen intra-annual variability in tree rings oxygen isotopes
Opposing seasonal trends in source water and sugar dampen intra-annual variability in tree rings oxygen isotopes Open
Intra-annual variations of oxygen isotope composition (δ18O) in tree rings offer insights into tree ecophysiology and how trees respond to climate. In this study, we focused on the interplay between the δ¹⁸O from sourc…
View article: Disentangling the impact of vegetation and hydroclimate dynamics on plant wax stable isotopes since the Younger Dryas in Central Switzerland
Disentangling the impact of vegetation and hydroclimate dynamics on plant wax stable isotopes since the Younger Dryas in Central Switzerland Open
The stable isotopic composition of plant waxes (δ13C and δ2H values) in lake sediments is a powerful tool for reconstructing past climates and environments, offering critical insights into hydroclimate variability and vegetation …
View article: Who is who in necromass formation and stabilization in soil? Unraveling the role of fungi and bacteria as complementary players of biogeochemical functioning
Who is who in necromass formation and stabilization in soil? Unraveling the role of fungi and bacteria as complementary players of biogeochemical functioning Open
Multiple global change drivers have caused a large carbon (C) debt in our soils. To remedy this debt, understanding the role of microorganisms in soil C cycling is crucial to tackle the C soil loss. Microbial carbon use efficiency (CUE) is…
View article: Algal lipid distributions and hydrogen isotope ratios reflect phytoplankton community dynamics
Algal lipid distributions and hydrogen isotope ratios reflect phytoplankton community dynamics Open
Reconstructions of past changes in algal community composition provide important context for future alterations in biogeochemical cycling. However, many existing phytoplankton proxies are indicative of individual algal groups and are not f…
View article: Phylogenetic and biochemical drivers of plant species variation in organic compound hydrogen stable isotopes: novel mechanistic constraints
Phylogenetic and biochemical drivers of plant species variation in organic compound hydrogen stable isotopes: novel mechanistic constraints Open
Summary Significant variation in plant organic compound hydrogen stable isotope (δ 2 H) values among species from a single location suggests species biochemistry diversity as a key driver. However, the biochemical mechanisms and the biolog…
View article: Who is who in necromass formation and stabilization in soil? The role of fungi and bacteria as complementary players of biogeochemical functioning
Who is who in necromass formation and stabilization in soil? The role of fungi and bacteria as complementary players of biogeochemical functioning Open
Multiple global change drivers have caused a large carbon (C) debt in our soils. To remedy this debt, understanding the role of microorganisms in soil C cycling is crucial to tackle the C soil loss. Microbial carbon use efficiency (CUE) is…
View article: Taxon-specific hydrogen isotope signals in cultures and mesocosms facilitate ecosystem and hydroclimate reconstruction
Taxon-specific hydrogen isotope signals in cultures and mesocosms facilitate ecosystem and hydroclimate reconstruction Open
Phytoplankton play a key role in biogeochemical cycles, impacting atmospheric and aquatic chemistry, food webs, and water quality. However, it remains challenging to reconstruct changes in algal community composition throughout the geologi…
View article: Plant diversity drives positive microbial associations in the rhizosphere enhancing carbon use efficiency in agricultural soils
Plant diversity drives positive microbial associations in the rhizosphere enhancing carbon use efficiency in agricultural soils Open
Expanding and intensifying agriculture has led to a loss of soil carbon. As agroecosystems cover over 40% of Earth's land surface, they must be part of the solution put in action to mitigate climate change. Development of efficient managem…
View article: Large enrichments in fatty acid <sup>2</sup> H/ <sup>1</sup> H ratios distinguish respiration from aerobic fermentation in yeast <i>Saccharomyces cerevisiae</i>
Large enrichments in fatty acid <sup>2</sup> H/ <sup>1</sup> H ratios distinguish respiration from aerobic fermentation in yeast <i>Saccharomyces cerevisiae</i> Open
Shifts in the hydrogen stable isotopic composition ( 2 H/ 1 H ratio) of lipids relative to water (lipid/water 2 H-fractionation) at natural abundances reflect different sources of the central cellular reductant, NADPH, in bacteria. Here, w…
View article: Effects of increasing atmospheric <scp>CO</scp><sub>2</sub> on leaf water δ<sup>18</sup><scp>O</scp> values are small and are attenuated in grasses and amplified in dicotyledonous herbs and legumes when transferred to cellulose δ<sup>18</sup><scp>O</scp> values
Effects of increasing atmospheric <span>CO</span><sub>2</sub> on leaf water δ<sup>18</sup><span>O</span> values are small and are attenuated in grasses and amplified in dicotyledonous herbs and legumes when transferred to cellulose δ<sup>18</sup><span>O</span> values Open
Summary The oxygen isotope composition of cellulose (δ 18 O values) has been suggested to contain information on stomatal conductance ( g s ) responses to rising p CO 2 . The extent by which p CO 2 affects leaf water and cellulose δ 18 O v…
View article: Toward using &#948;2H values for investigating marine mixotrophy
Toward using δ2H values for investigating marine mixotrophy Open
Hydrogen isotope ratios (δ2H) measured on lipids extracted from aquatic and terrestrial organisms are widely applied for studying past hydro-climatic conditions. A growing body of evidence suggests that δ2H values of lipids integ…
View article: Decreased precipitation intensity in the South Pacific Convergence Zone during the Little Ice Age inferred from dinosterol hydrogen isotope ratios
Decreased precipitation intensity in the South Pacific Convergence Zone during the Little Ice Age inferred from dinosterol hydrogen isotope ratios Open
The South Pacific Convergence Zone (SPCZ) is the most prominent precipitation feature in the southern hemisphere, extending southeast from Papua New Guinea to French Polynesia. Changes in SPCZ precipitation dynamics can have major impacts …
View article: Land use intensity has a stronger effect on the temperature sensitivity of soil microbial carbon cycling processes than long-term climate change.
Land use intensity has a stronger effect on the temperature sensitivity of soil microbial carbon cycling processes than long-term climate change. Open
Microbes are responsible for the cycling of carbon (C) in soils, and predicted changes in soil C stocks under climate change are highly sensitive to shifts in the mechanisms thought to control microbial physiological response to warming. T…
View article: Is the sensitivity of leaf water and cellulose &#948;18O values sufficient for detecting effects of increasing atmospheric CO2 on stomatal conductance in plants?&#160;
Is the sensitivity of leaf water and cellulose δ18O values sufficient for detecting effects of increasing atmospheric CO2 on stomatal conductance in plants?  Open
The oxygen isotope composition of cellulose (δ18O values) has been suggested to contain information on stomatal conductance (gs) responses to rising pCO2. The extent by which pCO2 affects leaf water and cellulose δ18O values (	…
View article: Varying amounts of isotopic exchange among dual water hydrogen isotope exchange methods indicate different pools of exchangeable hydrogen&#160;
Varying amounts of isotopic exchange among dual water hydrogen isotope exchange methods indicate different pools of exchangeable hydrogen  Open
The hydrogen isotopic composition of organic compounds carries information relating to the isotopic composition of biosynthetic source water, as well as source-organism biochemistry. This has led to diverse applications in areas such as pa…
View article: Comparison of lipid biomarkers and their hydrogen isotopic values in submerged vascular macrophytes and charophytes
Comparison of lipid biomarkers and their hydrogen isotopic values in submerged vascular macrophytes and charophytes Open
Submerged macrophytes incorporate lake water directly during lipid synthesis, making the δ2H values of their lipids a crucial tool for reconstructing past hydrology and lake states. Despite this significance, the lipid biomarkers of a…
View article: The hydrogen isotope composition of nocturnal sucrose does not reflect the 2H-depletion of remobilized leaf starch
The hydrogen isotope composition of nocturnal sucrose does not reflect the 2H-depletion of remobilized leaf starch Open
The hydrogen isotope composition (δ2H) of cellulose is inherently linked to that of sucrose synthesised in leaves. During the daytime, sucrose is synthesised from photosynthetic products, and at night, from remobilised starch. From th…
View article: A new lipid-based proxy for the reconstruction of past phytoplankton ecological dynamics
A new lipid-based proxy for the reconstruction of past phytoplankton ecological dynamics Open
The composition of lacustrine phytoplankton communities plays a key role for biogeochemical cycling of carbon, nitrogen, and phosphorus. Through the linkage between lakes and terrestrial ecosystems, especially via carbon cycling and freshw…