A5024946424- Isotope Analysis in Ecology
- Plant Water Relations and Carbon Dynamics
- Soil Carbon and Nitrogen Dynamics
- Fish Ecology and Management Studies
- Fish biology, ecology, and behavior
- Forest ecology and management
- Atmospheric and Environmental Gas Dynamics
- Environmental and biological studies
- Groundwater and Isotope Geochemistry
- Marine animal studies overview
- Water Quality and Pollution Assessment
- Soil Management and Crop Yield
- Geology and Paleoclimatology Research
- Mercury impact and mitigation studies
- Wildlife Ecology and Conservation
- Animal Ecology and Behavior Studies
- Avian ecology and behavior
- Plant and animal studies
- Fermentation and Sensory Analysis
- Ecology and Vegetation Dynamics Studies
- Marine and coastal ecosystems
- Fish Biology and Ecology Studies
- Geography and Environmental Studies
- Soil and Unsaturated Flow
- Soil and Water Nutrient Dynamics
Universidade de São Paulo
2016-2025
i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto
2024
Hospital Universitário da Universidade de São Paulo
2020-2022
Universidade Federal de Uberlândia
2022
Instituto Superior da Maia
2022
Universidade Federal do Acre
2022
Centro Universitário do Maranhão
2022
ORCID
2021
Universidade Cidade de São Paulo
2016
Methodist University of Piracicaba
2015
Moist tropical forests in Amazonia and elsewhere are subjected to increasingly severe drought episodes through the El Niño–Southern Oscillation (ENSO) possibly deforestation‐driven reductions rainfall. The effects of this trend on forest canopy dynamics, emissions greenhouse gases, other ecological functions potentially large but poorly understood. We established a throughfall exclusion experiment an east‐central Amazon (Tapajós National Forest, Brazil) help understand these effects. After...
Summary Leaf traits are commonly associated with the life history, distribution and resource requirements of a species. To improve our understanding ecological physiological differences between tropical savanna forest trees, we compared leaf species native to gallery (riverine) forests in Cerrado region central Brazil. Congeneric pairs from 14 different taxonomic families were studied, each present at study site. Only individuals growing conditions under full sun studied. We measured foliar...
Using a simple isotope mixing model, we evaluated the relative proportion of water vapour generated by plant transpiration and soil evaporation at two sites in Amazon basin. Sampling was carried out different covers (forest pasture), seasonal tropical rainforest eastern where major deforestation is result land‐use change, compared to less central forest. In both forests, from responsible for most, if not all, forest, while it could be detected above grassy pastures. Thus canopy may source...
The broad negative consequences of habitat degradation on biodiversity have been studied, but the complex effects natural-agricultural landscape matrices remain poorly understood. Here we used stable carbon and nitrogen isotopes to detect changes in mammal resource use trophic structure between preserved areas human-modified landscapes (HMLs) a hot spot South America. We classified mammals into guilds compared (in terms C3- C4-derived carbon), isotopic niches, across 2 systems. In HMLs,...
Carbon and nitrogen isotope ratios of human fingernails were measured in 490 individuals the western US 273 southeastern Brazil living urban areas, 53 a moderately isolated area central Amazon region consuming mostly locally grown foods. In addition, we carbon common food items to assess extent which these isotopic signatures remain distinct for people eating both omnivorous vegetarian diets different parts world, dietary information can be interpreted from analyses. Fingernail δ13C values...
The isotopic signatures of 15N and 18O in N2O emitted from tropical soils vary both spatially temporally, leading to large uncertainty the overall source signature thereby limiting utility isotopes constraining global budget. Determining reasons for spatial temporal variations isotope requires that we know enrichment factors nitrification denitrification, two processes produce soils. We have devised a method measuring these using soil incubation experiments report results this three rain...
1 Ecological and physiological characteristics of vascular plants may facilitate or constrain hydraulic lift. Studies lift typically include only one few species, but in species-rich ecosystems a larger number representative species needs to be studied. 2 Measurements sap flow tap roots, lateral roots stems, as well stable isotope labelling techniques were used determine the occurrence relative magnitude several individuals nine co-occurring Brazilian savanna (Cerrado) tree differing...
It is well recognized that assemblage structure of stream macroinvertebrates changes with alterations in catchment or local land use. Our objective was to understand how the trophic ecology benthic macroinvertebrate assemblages responds use tropical streams. We used isotope methodology assess energy flow and relations among were affected environments by different uses (natural cover, pasture, sugar cane plantation). Macroinvertebrates sampled categorized into functional feeding groups,...
Tropical rainforests support the greatest diversity of small mammals in world, yet we have little understanding about mechanisms that promote coexistence species. Diet partitioning can favor by lessening competition, and interspecific differences body size habitat use are usually proposed to be associated with trophic divergence. However, classic dietary methods (e.g. stomach contents) is challenging mammals, particularly community-level studies, thus used stable isotopes (δ13C δ15N) infer...
Our objective was to measure the stable carbon isotope composition of leaf tissue and CO 2 released by respiration (δ r ), use this information as an estimate changes in ecosystem isotopic discrimination that occur response seasonal interannual environmental conditions, land‐use change (forest‐pasture conversion). We made measurements primary forest pastures Amazon Basin Brazil. At Santarém site, δ values showed a cycle varying from less than −29‰ approximately −26‰. The observed correlated...
The return of water in vapor form from the land to atmosphere, via plant transpiration and evaporation, is fundamental for maintenance regional cycle Amazon basin. Whereas transpiration, dominant process, has extensive vegetation cover as a large single source, evaporation can have several sources, their relative importance location are poorly known. isotopic composition (δ18O δD) various sources was used see whether or not specific atmosphere could be determined. It well established that...
Summary We report hydraulic lift in the savanna vegetation of central Brazil ( Cerrado ). Both heat‐pulse measurements and isotopic (deuterium) labelling were used to determine whether occurred two common species, neighbouring small shrubs trees utilizing this water. techniques showed water uptake by tap‐roots reverse flow lateral roots. Roots transferred hydraulically lifted soil, labelled individuals deuterated Isotopic mass‐balance equations sap‐flow that taken up tap‐root each individual...
Deuterium-labeled water was used to study the effect of Tapajós Throughfall Exclusion Experiment (TTEE) on soil moisture movement and depth uptake by trees Coussarea racemosa, Sclerolobium chrysophyllum, Eschweilera pedicellata. The TTEE simulates an extended dry season in eastern Amazonian rainforest, a plausible scenario if El Niño phenomenon changes with climate change. excludes 60% wet throughfall from 1-ha plot (treatment), while control receives precipitation year-round. Mean...
Potassium (K) is an important limiting factor of tree growth, but little known the effects K supply on long-distance transport photosynthetic carbon (C) in phloem and interaction between fertilization drought. We pulse-labelled 2-year-old Eucalyptus grandis L. trees grown a field trial combining (+K −K) throughfall exclusion (+W −W), we estimated velocity C transfer by comparing time lags uptake 13CO2 its recovery trunk CO2 efflux recorded at different heights. also analysed dynamics...
Abstract We evaluated puma ( Puma concolor ) feeding patterns in southeastern Brazilian agricultural landscapes using carbon and nitrogen stable isotope analyses of hair collected from fecal samples N = 64). classified the into three groups: based on forest remnants, matrix or both. observed a predominance consumption C 3 prey (~47% individuals) area with highest proportion coverage. Conversely, 4 were highly consumed (~40% where was predominant. The δ 13 values for pumas both areas...