A5009518148- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Plant and animal studies
- Atmospheric chemistry and aerosols
- Environmental and biological studies
- Forest ecology and management
- Plant biochemistry and biosynthesis
- Ecology and Vegetation Dynamics Studies
- Remote Sensing in Agriculture
- Antioxidant Activity and Oxidative Stress
- Tree-ring climate responses
- Climate variability and models
- Hydrology and Watershed Management Studies
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Leaf Properties and Growth Measurement
- Plant Diversity and Evolution
- Odor and Emission Control Technologies
- Conservation, Biodiversity, and Resource Management
- Human-Automation Interaction and Safety
- Space Exploration and Technology
- Climate change and permafrost
- Fern and Epiphyte Biology
- Ecosystem dynamics and resilience
- African Botany and Ecology Studies
University of Michigan
2022-2024
University of Miami
2018-2024
University of Arizona
2011-2021
University of Florida
2020
Fairchild Tropical Botanic Garden
2018
Charles River Laboratories (Netherlands)
2015
Summary Seasonal dynamics in the vertical distribution of leaf area index ( LAI ) may impact seasonality forest productivity Amazonian forests. However, until recently, fine‐scale observations critical to revealing ecological mechanisms underlying these changes have been lacking. To investigate variation with and drought we conducted monthly ground‐based LiDAR surveys over 4 yr at an Amazon site. We analysed temporal vertically structured along axes both canopy height light environments....
Abstract Surface‐to‐atmosphere emissions of dimethyl sulfide (DMS) may impact global climate through the formation gaseous sulfuric acid, which can yield secondary sulfate aerosols and contribute to new particle formation. While oceans are generally considered dominant sources DMS, a shortage ecosystem observations prevents an accurate analysis terrestrial DMS sources. Using mass spectrometry, we quantified ambient mixing ratios within above primary rainforest in central Amazon Basin...
Summary The prediction of vegetation responses to climate requires a knowledge how climate‐sensitive plant traits mediate not only the individual plants, but also shifts in species and functional compositions whole communities. emission isoprene gas – trait shared by one‐third tree is known protect leaf biochemistry under climatic stress. Here, we test hypothesis that shapes tropical forests enhancing tolerance emitting trees heat drought. Using forest inventory data, estimated proportional...
Abstract Experimental research shows that isoprene emission by plants can improve photosynthetic performance at high temperatures. But whether species emit have higher thermal limits than non‐emitting remains largely untested. Tropical are adapted to narrow temperature ranges and global warming could result in significant ecosystem restructuring due small variations species' tolerances. We compared responses of 26 co‐occurring tropical tree liana test isoprene‐emitting more tolerant...
Abstract The occurrence of annual growth rings in tropical trees—the result the seasonal activity vascular cambium—has been explained by water deficit or flooding periods. However, little is known about drivers tree‐ring formation under hyper‐humid conditions without clear dry periods (ever‐wet conditions). Shelford's law states that excess environmental resources limits plant growth. Accordingly, we hypothesize soil moisture, a slight reduction precipitation and light availability determine...
Volatile isoprenoids take part in a wide range of forest-atmosphere processes that scale from plant cell regulation to atmospheric particle formation. Major drivers leaf emissions are light and temperature - i.e., seasonality age, suggesting phenological type (i.e., evergreen or brevideciduous) may exert control over emission rates. The Amazon Forest is the greatest most diverse source volatile isoprenoid emissions, but lack leaf-level studies logistical challenges measuring such remote...
Abstract. Organic acids, central to terrestrial carbon metabolism and atmospheric photochemistry, are ubiquitous in the troposphere gas, particle, aqueous phases. As dominant organic acids atmosphere, formic acid (FA, HCOOH) acetic (AA, CH3COOH) control precipitation acidity remote regions may represent a critical link between water cycles by acting as key intermediates plant energy aerosol-cloud-precipitation interactions. However, our understanding of exchange these ecosystems atmosphere...
Biogenic Volatile Organic Compounds (BVOCs) are primarily emitted into the atmosphere by plants. These compounds serve various functions, including cellular protection and defense at leaf level, chemical signaling between within plants, regulation of large-scale biogeochemical processes, such as influencing atmospheric chemistry contributing to aerosol formation. The Amazon Forest is major source BVOCs global atmosphere.  Over past four decades, multiple studies have measured BVOC...
Abstract. Isoprene emissions are a key component in biosphere–atmosphere interactions, and the most significant global source is Amazon rainforest. However, intra- interannual variations biological environmental factors that regulate isoprene emission from Amazonia not well understood and, thereby, poorly represented models. Here, with datasets covering several years of measurements at Tall Tower Observatory (ATTO) central Amazonia, Brazil, we (1) quantified canopy profiles mixing ratios...
We identify changes in the functional composition of vascular epiphytes along a tropical elevational gradient with aim quantifying role climate determining assembly epiphyte communities. measured seven leaf traits (leaf area, specific dry-matter content, thickness, force to punch, stomatal density, and potential conductance index) 163 most abundant species recorded across 10 sites located an between 60 2,900 m above sea level Colombian Andes. grouped into hierarchical groups according their...
Volatile isoprenoids regulate plant performance and atmospheric processes, Amazon forests comprise the dominant source to global atmosphere. Still, there is a poor understanding of how isoprenoid emission capacities vary in response ecophysiological environmental controls Amazonian ecosystems. We measured three hyperdominant tree species - Protium hebetatum, Eschweilera grandiflora, coriacea across seasons along topographic edaphic gradient central Amazon. From wet dry season, both...
Both plant physiology and atmospheric chemistry are substantially altered by the emission of volatile isoprenoids (VI), such as isoprene monoterpenes, from leaves. Yet, since gaining scientific attention in 1950’s, empirical research on leaf VI has been largely confined to laboratory experiments observations. Here, we introduce a new field instrument designed bridge scales atmosphere, enabling precision detection real time plants their natural ecological setting. With campaign Brazilian...
Abstract Science, engineering, and society increasingly require integrative thinking about emerging problems in complex systems, a notion referred to as convergence science. Due the concurrent pressures of two main stressors—rapid climate change industrialization, Arctic research demands such paradigm scientific inquiry. This perspective represents synthesis vision for its application system studies, developed by group disciplinary experts consisting social earth scientists, ecologists,...
Abstract. Organic acids, central to terrestrial carbon metabolism and atmospheric photochemistry, are ubiquitous in the troposphere gas, particle, aqueous phases. As dominant organic acids atmosphere, formic acid (FA, HCOOH) acetic (AA, CH3COOH) control precipitation acidity remote regions may represent a critical link between water cycles by acting as key intermediates plant energy aerosol-cloud-precipitation interactions. However, our understanding of exchange these ecosystems atmosphere...
Volatile isoprenoids regulate plant performance and atmospheric processes, Amazon forests comprise the dominant source to global atmosphere. Still, there is a poor understanding of how isoprenoid emission capacities vary in response ecophysiological environmental controls Amazonian ecosystems. We measured hyperdominant tree species—Protium hebetatum, Eschweilera grandiflora, coriacea — across seasons along topographic edaphic gradient central Amazon. From wet dry season, both photosynthesis...
The risk of a tipping point for Amazon forests — perturbation threshold beyond which abrupt, irreversible (or difficult to reverse) changes in forest function and large-scale tree die-off occur motivates much recent science policy work understand reduce the risk. However, virtually all date focuses on points as basin-wide phenomenon. To how may be triggered, we urgently need study mechanisms onsets at local-scales pivotal forests.  Here, used 12+ years observations (spread...
Tropical forest photosynthesis can decline at high temperatures due to (1) biochemical responses increasing temperature and (2) stomatal vapor pressure deficit (VPD), which is associated with temperature. It challenging disentangle the influence of these two mechanisms on in observations, because VPD are tightly correlated tropical forests. Nonetheless, quantifying relative strength essential for understanding how gross primary productivity (GPP) will respond climate change, atmospheric CO2...
Tropical forest photosynthesis can decline at high temperatures due to (1) biochemical responses increasing temperature and (2) stomatal vapor pressure deficit (VPD), which is associated with temperature. It challenging disentangle the influence of these two mechanisms on in observations, because VPD are tightly correlated tropical forests. Nonetheless, quantifying relative strength essential for understanding how gross primary production (GPP) will respond climate change, atmospheric CO
Amazônia is a species-rich region of immense importance to Earth's water and carbon cycling. Photosynthesis drives the global cycle, so understanding photosynthetic differences across diverse landscapes key task ecophysiology ecosystem science. Unfortunately, due physiological logistical constraints, ground-based photosynthesis data in remain scarce 'traditional' steady-state (SS) method gas exchange slow inefficient. The Dynamic Assimilation™ Technique (DAT) promises new way perform A/Ci...
The Amazon forest is the largest source of isoprene emissions, and seasonal pattern leaf-out phenology in this has been indicated as an important driver variation emissions. Still, it unclear how emissions vary between different leaf phenological types forest. To evaluate influence type over we measured leaf-level emission capacity functional traits for 175 trees from 124 species angiosperms distributed among brevideciduous evergreen a central Evergreen emitters were less likely to store...