A5036676753- Fish biology, ecology, and behavior
- Ecology and Vegetation Dynamics Studies
- Water Quality and Pollution Assessment
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Isotope Analysis in Ecology
- Soil Carbon and Nitrogen Dynamics
- Plant and animal studies
- Marine and coastal ecosystems
- Conservation, Biodiversity, and Resource Management
- Forest Ecology and Biodiversity Studies
- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Soil Management and Crop Yield
- Species Distribution and Climate Change
- Groundwater and Isotope Geochemistry
- Iron oxide chemistry and applications
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
- Plant Diversity and Evolution
- Environmental Toxicology and Ecotoxicology
- Remote Sensing and LiDAR Applications
- Environmental and biological studies
- Geography and Environmental Studies
- Analytical chemistry methods development
National Institute of Amazonian Research
2010-2021
Amazon (United States)
2012
Hospital Universitário Antônio Pedro
1995
Universidade Federal Fluminense
1995
Abstract. Soil samples were collected in six South American countries a total of 71 different 1 ha forest plots across the Amazon Basin as part RAINFOR project. They analysed for and exchangeable cations, C, N, pH with various P fractions also determined. Physical properties examined an index soil physical quality proposed. A diverse range soils was found. For western areas near Andean cordillera southern northern fringes, tend to be distributed among lower pedogenetic levels, while central...
We determined the concentrations and compositions of coarse particulate (>63 µm), fine (0.1–63 dissolved (0.001–0.1 µm) organic matter collected along a river reach extending from first‐order stream in Bolivian Andes, through Beni River system, to lower Madeira Amazon Rivers. Dissolved carbon (DOC) increased down total ~80 350 µM. The percentage DOC with molecular weight greater than ~1,000 atomic mass units that could be isolated by ultrafiltration also downstream 40 80%. Weight...
Abstract Rainfall, run‐off and dissolved particulate organic carbon concentrations were measured to investigate the hydrological export of out blackwater Igarapé Asu rainforest catchment over a two‐year period. Annual rainfall was above average (2442 mm) at 2976 mm in 2002 below 2054 2003. Surface dominated flow catchment, with groundwater outflow being negligible. Streamflow totals amounted 1362 780 Dissolved (DOC) similar those elsewhere Amazon Basin 1·2 mg l −1 , leading atmospheric DOC...
We evaluate the hypothesis that decomposition and adsorption reactions operating in upland soils of headwater catchments control concentration composition dissolved fine particulate organic matter rivers Amazon basin. In two contrasting first‐order characteristic central basin, we analyzed plant, litter, soil, groundwater, stream water chemistry. Our results indicate clear persistent differences exist elemental (DOM) waters groundwaters from catchments, due mainly to corresponding soil...
The results of a 10‐year time series study the chemistry Amazon River mainstem near Manaus, Brazil, are presented. All variables measured showed distinct seasonal patterns linked to discharge hydrograph except respiration rate and PO 4 −3 concentration. Stepwise multiple regression analysis that alkalinity, calcium, fine suspended sediment, sulfate were correlated, primarily, with percentage total water was derived from Andean drainages. Silicate, potassium, weight percentages carbon...
Riparian habitats are important for the maintenance of regional biodiversity. Many studies have compared bird distributions between riparian and non‐riparian but not established how wide used by birds are, as measured distance from nearest stream. We investigated distribution understory along gradients streams, soil clay content, slope in a central Amazonian forest, mist‐netting three times 45 plots. nonmetric multidimensional scaling (NMDS) to reduce dimensionality species quantitative...
Abstract Question How much variation in plant community structure and composition can be predicted using soil, flooding topography white‐sand vegetation of northern Amazonia? Location Brazil, A mazon, R oraima S tate, V iruá N ational P ark (01°46′34″ N, 61°02′06″ W). Methods Data from 17, 1‐ha permanent plots distributed across a 25 km 2 landscape within the ark, mazonia, was used to assess effects on tree species composition, diversity structure. Our analyses were based 16 599 trees ( DBH...
River floodplains are the dominant wetland habitat in Amazon river basin, providing important habitation for aquatic flora and fauna, playing a key role sustaining regional fish production. The annual inundation pulse has been identified as environmental factor affecting biota on floodplain, characteristics of this pulse, terms timing, duration amplitude, vary spatially floodplain function fluctuations stage height topography. furthermore globally significant sources methane (CH 4 ) other...
Abstract Establishing which factors determine species distributions is of major relevance for practical applications such as conservation planning. The Amazonian lowlands exhibit considerable internal heterogeneity that not apparent in existing vegetation maps. We used ferns a model group to study patterns plant and community composition at regional landscape scales. Fern environmental data were collected 109 plots 250 × 2 m distributed among four sites Brazilian Amazonia. Interplot...
Brazil nut, the Bertholletia excelsa seed, is one of most important non-timber forest products in Amazon Forest and livelihoods thousands traditional Amazonian families depend on its commercialization. B. has been frequently cited as an indicator anthropogenic forests there strong evidence that past human management significantly contributed to present distribution across Amazon, suggesting low levels harvesting may play a positive role recruitment. Here, we evaluate effects nut by Kayapó...
Abstract. Soil samples were collected in six South American countries a total of 71 different 1 ha forest plots across the Amazon Basin as part RAINFOR project. They analysed for and exchangeable cations, C, N, pH with various P fractions also determined. Physical properties examined an index soil physical quality proposed. A diverse range soils was found. For western areas near Andean cordillera southern northern fringes, tend to be distributed among lower pedogenetic levels, while central...
The database of the Brazilian Program for Biodiversity Research (PPBio; GIVD ID SA-BR-001) includes data on environment and biological groups such as plants.It is organized by site, which usually a grid with 10 to 72 uniformly-distributed plots, has already surveyed 1,638 relevés across different ecosystems.The sampling design based RAPELD system allow integration from diverse taxa ecosystem processes.RAPELD spatially-explicit scheme monitor biodiversity in long-term ecological research...
Abstract Questions Are topography‐based forest types floristically consistent between sites in central A mazonia? Do broad landform and geological features control site‐specific edaphic floristic variation therefore obfuscate the classification based on local topographical classes? Is model‐based clustering a useful tool for classification? Location Non‐inundated of mazonia, north mazon R iver. Methods We analysed species presence–absence group terrestrial monocot herbs ( Z ingiberales) 123...
Biomass of roots, the root : shoot ratio (ratio below- to aboveground biomass) and carbon stocks belowground (to 100-cm depth) were estimated in different open savannah environments extreme north Brazilian Amazon. Sampling was conducted permanent plots established two areas state Roraima. We identified four phytopedounits 27 sampled areas: dry grasslands on Argisol/Ultisol soils (DG-Arg), eight Latosol/Oxisol (DG-Lts), five a mosaic with savannah-parkland (GP-Lts) 10 seasonally flooded (wet)...
Abstract: The mechanisms that maintain palm species diversity in tropical rain forests are still debated. Spatial variation forest structure produces small-scale environmental heterogeneity, which turn can affect plant survival and reproductive performance. An understanding of how palms respond to heterogeneity may help explain the their assemblages. We used multivariate ordination statistics multiple linear models analyse assemblages affected by landscape features central Amazonia. In 72...
A concentração de mercúrio total foi determinada em onze espécies peixes coletados setembro a outubro 1991, na área garimpo ouro da Cachoeira Tcotônio e considerada controle Guajará-Mirim, ambas no rio Madeira, Estado Rondônia. Utilizou-se, para análise, técnica espectrofotometria absorção atômica com gerador vapor frio Hg. Quase todos os predadores tiveram concentrações acima do nível critico 0,5 pg.g"1 permitido consumo humano pelo Ministério Saúde Brasil Organização Mundial Saúde, sendo...
Tropical rivers such as the Rio Negro constitute a major portion of global aquatic flux dissolved organic carbon (DOC) entering ocean, but exact amount, source contributions and fate terrestrial DOC remain unknown. We investigated role valley upland whitesand ecosystems (WSEs) terra firme plateaus in forming blackwater tributaries basin to develop novel constraints for export carbon. 5709 molecular markers from ground- surface waters two contrasting sites feeding were identified by ultrahigh...
Demonstrates how multi-temporal JERS-1 L/sub HH/ band SAR data can be used to derive detailed spatial and temporal information about wetland distributions improve estimates of methane fluxes from these environments. Within the framework NASDA-led Global Rain Forest Mapping (GRFM) project, a part Jau/spl acute/ river in central Amazon basin, was monitored during two full flooding cycles with JERS-1, spatial/temporal model inundation patterns along 40-km long segment developed. Simultaneously...