A5001010661- Isotope Analysis in Ecology
- Fish biology, ecology, and behavior
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Microbial Community Ecology and Physiology
- Water Quality and Pollution Assessment
- Soil Carbon and Nitrogen Dynamics
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Soil Management and Crop Yield
- Forest ecology and management
- Tree-ring climate responses
- Fish Ecology and Management Studies
- Geochemistry and Geologic Mapping
- Growth and nutrition in plants
- Aquatic Ecosystems and Phytoplankton Dynamics
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Advanced Machining and Optimization Techniques
- Geography and Environmental Studies
- Ecology and Vegetation Dynamics Studies
- Advanced Surface Polishing Techniques
- Environmental and biological studies
Universidade Federal do Oeste do Pará
2013-2024
Massachusetts Institute of Technology
2023
Woods Hole Oceanographic Institution
2023
Universidade Federal do Pará
2014
Royal Military Academy
2013
Canadian Standards Association
2013
Institute of Electrical and Electronics Engineers
2013
Applied Radar (United States)
2013
University of Pavia
2013
University of North Carolina at Chapel Hill
2004
Abstract A portion of the charcoal and soot produced during combustion processes on land (e.g., wildfire, burning fossil fuels) enters aquatic systems as dissolved black carbon (DBC). In terms mass flux, rivers are main identified source DBC to oceans. Since is believed be representative refractory pool, constraining sources marine key understanding long-term persistence in our global Here, we use compound-specific stable isotopes (δ 13 C) reveal that oceans ~6‰ enriched C compared exported...
Abstract The Congo and Amazon are the two largest rivers on Earth serve as major sources of dissolved organic carbon to ocean. We compared matter (DOM) composition both using Fourier‐transform ion cyclotron resonance mass spectrometry investigate seasonal regional differences in DOM exported found that over a 15‐month observational period River, molecular aromaticity oxygenation between wet dry periods varied slightly, but most relative abundance formulae (∼90%) were present all samples,...
Abstract The Amazon River drains a diverse tropical landscape greater than 6 million km 2 , culminating in the world's largest export of freshwater and dissolved constituents to ocean. Here, we present organic carbon (DOC), inorganic nitrogen (DON, DIN), orthophosphate (PO 4 3− ), major trace ion concentrations fluxes from using 26 samples collected over three annual hydrographs. Concentrations were predominantly controlled by wet season flood pulse. Average DOC, DON, DIN, PO (±1 s.d.) 25.5...
Abstract Radon‐222 (Rn‐222) is used as a transport tracer of forest canopy–atmosphere CO 2 exchange in an old‐growth, tropical rain site near km 67 the Tapajós National Forest, Pará, Brazil. Initial results, from month‐long periods at end wet season (June–July) and dry (November–December) 2001, demonstrate potential new Rn measurement instruments methods to quantify mass processes between canopies atmosphere. Gas rates yield mean canopy air residence times ranging minutes during turbulent...
Abstract Tropical ecosystems are undergoing unprecedented rates of degradation from deforestation, fire, and drought disturbances. The collective effects these disturbances threaten to shift large portions tropical such as Amazon forests into savanna‐like structure via tree loss, functional changes, the emergence fire (savannization). Changes forest states a more open can affect local microclimates, surface energy fluxes, biosphere–atmosphere interactions. A predominant type ecosystem state...
Abstract As climate‐driven El Niño Southern Oscillation (ENSO) events are projected to increase in frequency and severity, much attention has focused on impacts regarding ecosystem productivity carbon balance Amazonian rainforests, with comparatively little given dynamics fluvial ecosystems. In this study, we compared the wet 2012 La Niña period following normal hydrologic Amazon River. Elevated water flux during was accompanied by dilution of inorganic ion concentrations. Furthermore,...
The Amazonian floodplain forests are dynamic ecosystems of great importance for the regional hydrological and biogeochemical cycles function as a significant CH4 source contributing to global carbon balance. Unique geochemical factors may drive microbial community composition and, consequently, affect emissions across areas. Here, we report in situ cycling communities sediments. We considered how abiotic more specifically, groups. collected sediment samples during wet dry seasons from three...
The stable carbon isotopic composition of methane (δ13C-CH4) gas bubbles formed in the sediments three Amazonian streamswas determined over a 5-yr period. study sites were two 'várzea' floodplain (Açu and Maicá) one 'terrafirme' (Jamaraquá) streams. δ13C sedimentary organic matter (SOM) from surrounding vegetation bottom also determined. mean value SOM was lower terra-firme (–29.6‰) than várzea stream (–23.8‰) as result less C4 plant deposition former. δ13C-CH4 values varied systematically...
Abstract Seasonal floodplains in the Amazon basin are important sources of methane (CH 4 ), while upland forests known for their sink capacity. Climate change effects, including shifts rainfall patterns and rising temperatures, may alter functionality soil microbial communities, leading to uncertain changes CH cycling dynamics. To investigate feedback under climate scenarios, we performed a microcosm experiment using soils from two (i.e., Amazonas Tapajós rivers) one forest. We employed...
Abstract The influence of Amazonian floodplains on the hydrological, sedimentary, and biogeochemical river budget was investigated over a 2000-km reach. A process-based model relying closure chemical fluxes isotopic signals implemented. On average for whole studied reach, overall carbon associated with mineralization aquatic photosynthesis were estimated to 35.7 15.3 Tg C yr−1, respectively. Almost 57% sequestrated by comes from aerial sources (flooded forest); remaining 43% resulted (várzea...
Abstract The influence of Amazonian floodplains on the hydrological, sedimentary, and biogeochemical river budget was investigated along Vargem Grande–Óbidos reach, by applying six mixing models based variable regional and/or hydrological sources. By comparing output many different designed for purposes, nature magnitude processes linking water budgets were clarified. This study reveals that most chemical baseline Amazon River basin is acquired before studied 2000-km reach. However, tight...
The low availability of phosphorus and water in soil can promote the remobilization carbohydrates plant, releasing energy to mitigate stress. In this context, our objective was analyze production allocation plants Carapa guianensis Aubl. submitted different doses phosphate fertilization, during rainy dry seasons, western region Pará. We used three dosages (0, 50, 250 kg ha−1) as treatments. evaluated wet seasons. quantified matter production, content, total soluble sugars, reducing sucrose,...
The production and emission of CO2 in native, pasture cultivated areas is a result microbiological activity mineralization organic matter, depends on favorable environmental factors, such as temperature, availability water land use. results this work show that the no tillage system (NT) has potential to mitigate 37.7% C-CO2 efflux from cultivation soy compared conventional (CT). temperature soil accounted for 65% variability flux CO2-C CT. variation moisture explained 73 51% CT NT,...
Resumo O metano é o segundo gás de efeito estufa e sua concentração na atmosfera aumentou 259% desde 1750. A média global da fração molar CH4 atingiu um novo recorde 1813 ± 2 ppb em 2011. Este trabalho objetiva quantificar a fluxo no perfil vertical floresta primária tropical (Floresta Nacional do Tapajós), assim como, determinar emissão interface solo-atmosfera durante período chuvoso estiagem para ano 2012. Amostras ar foram coletadas in situ diretamente solo através uso câmaras estáticas...
Abstract The Amazonian floodplain forests are dynamic ecosystems of great importance for the regional hydrological and biogeochemical cycles provide a significant contribution to global carbon balance. Unique geochemical factors may drive microbial community composition and, consequently, affect CH 4 emissions across areas. Here we first report in situ seasonal dynamics cycling communities floodplains. We asked how abiotic both overall further investigated their responses changes. collected...
Methane (CH4) is a greenhouse gas with 35 times the warming potential of carbon dioxide. In last 15 years, concentration atmospheric CH4 has sharply increased and signature stable isotope in become more negative suggesting biotic sources, such as tropical wetlands, might be partly responsible current methane budget. Floodplains Brazilian Amazon have been found to release vast amounts but dynamics upland forests are not very well studied. We assessed magnitude fluxes from soil tree stem...
Livestock systems have been identified as major emitters of greenhouse gases due to the use extensive areas with degraded pastures. The objective this study was analyze carbon (CO2) and methane (CH4) fluxes in atmosphere indicators environmental sustainability silvopastoral systems. CO2 CH4 from soil were monitored a pasture (predominant species: Panicum maximum cv. Mombaça) grown full sun compared tree species (Bertholletia excelsa, Dipteryx odorata, Khaya grandifoliola) productive (Panicum...
Abstract The Amazon River mobilizes organic carbon across one of the world's largest terrestrial reservoirs. Quantifying sources particulate (POC) to this flux is typically challenging in large systems such as due hydrodynamic sorting sediments. Here, we analyze composition POC collected from multiple total suspended sediment (TSS) profiles mainstem at Óbidos, and surface samples Madeira, Solimões Tapajós Rivers. As hypothesized, TSS concentrations increased with depth fit well Rouse models...
Increases in hydrological extremes, including drought, are expected for Amazon forests. A fundamental challenge predicting forest responses lies identifying ecological strategies which underlie such responses. Characterization of species-specific hydraulic regulating water-use, thought to be arrayed along an 'isohydric-anisohydric' spectrum, is a widely used approach. However, recent studies have questioned the usefulness this classification scheme, because its metrics strongly influenced by...
The article discusses the importance of press advisory in military institutions, highlighting need for an effective flow information between these organizations and media. Social communication is essential building a positive image, armed forces should adopt proactive mindset regarding dissemination their activities. text emphasizes that, despite limited resources, creative well-planned work can compensate lack investment advertising, promoting better relationship with public opinion...