Felipe Siqueira PachecoCornell University | CU · Department of Ecology and Evolutionary Biology
Felipe Siqueira Pacheco
PhD
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68
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Introduction
Publications
Publications (68)
This work addresses the relationships between Land Use/Land Cover (LULC) and water quality in the Paraíba do Sul River (PSR), located in one of the most populated regions in Brazil. We conducted a water sampling program (analyzing nitrate, ammonium, phosphate, turbidity, total carbon, oxygen concentration, and conductivity) during a severe drought...
Abundant research has been devoted to understanding the complexity of the biogeochemical and physical processes that are responsible for greenhouse gas (GHG) emissions from hydropower reservoirs. These systems may have spatially complex and heterogeneous GHG emissions due to flooded biomass, river inflows, primary production and dam operation. In t...
Lakes play a large role in global atmospheric and landscape carbon (C) processes, but their role may change as they become polluted with nutrients. Geographic regions rich in surface waters are also prone to agricultural and urban development and so may become increasingly eutrophic as the population rises. Here we develop C budgets of highly eutro...
Hydroelectric reservoirs generate energy without significant combustion of fossil fuels. However, these systems can, potentially, emit greenhouse gases (GHG’s) at a rate which may be significant at the global scale, and, possible, co-equal, per kilowatt-hour, to that from conventional coal or oil-fired systems. Although much of the new construction...
This study aims to examine the driving effects of climate change on the spatial distribution of altitude grassland vegetation along an altitudinal range above 400 m in Serra do Amolar and Morraria do Urucum, both inserted in the Pantanal wetlands located in the State of Mato Grosso do Sul, Brazil. Data variables from Google Earth Engine was obtaine...
Trust and interpretability are crucial for the use of Artificial Intelligence (AI) in scientific research, but current models often operate as black boxes offering limited transparency and justifications for their outputs. We introduce AiSciVision, a framework that specializes Large Multimodal Models (LMMs) into interactive research partners and cl...
Sustainability challenges inherently involve the consideration of multiple competing objectives. The Pareto frontier – the set of all optimal solutions that cannot be improved with respect to one objective without negatively affecting another – is a crucial decision-making tool for navigating sustainability challenges as it highlights the inherent...
Changes in the physical and biogeochemical properties of water columns are frequently associated with cold fronts and mesoscale convective systems due to increased cloud cover. The effects of low-level jet (LLJ) events on thermal stratification and water quality, however, remain undescribed, particularly for tropical reservoirs. Here, water tempera...
Aquaculture is growing rapidly in the Amazon basin and detailed spatial information is needed to understand the trade-offs between food production, economic development, and environmental impacts. Large open-source datasets of medium resolution satellite imagery offer the potential for mapping a variety of infrastructure, including aquaculture pond...
Aim:
Understanding the variation in community composition and species abundances (i.e., β-diversity) is at the heart of community ecology. A common approach to examine β-diversity is to evaluate directional variation in community composition by measuring the decay in the similarity among pairs of communities along spatial or environmental distance...
Tropical ecosystems store large amounts of carbon (e.g., tropical forests, peatlands); however, the high rates of ecosystem conversion due to intense land use and land cover changes lead to significant emissions of greenhouse gases (GHGs) to the atmosphere. Additionally, forest degradation, such as unmanaged timber harvest and forest fires, account...
p>In the version of this article originally published, there were errors in Fig. 7 and equation (4). In Fig. 7, the center heading, now reading “Food plate to farm gate price ratio = 3” originally read, in part, “ratio = 1.” In equation 4, now reading (Formula presented.) an extraneous minus symbol was present before “6.20.” The errors have been co...
Insight into the response of cereal yields to nitrogen fertilizer is fundamental to improving nutrient management and policies to sustain economic crop benefits and food sufficiency with minimum nitrogen pollution. Here we propose a new method to assess long-term (LT) regional sustainable nitrogen inputs. The core is a novel scaled response functio...
Over 420 million ha of forest were lost to deforestation from 1990 to 2020; more than 90% of that loss took place in tropical areas (high confidence), threatening biodiversity, environmental services, livelihoods of forest communities and resilience to climate shocks (high confidence1 ). Forty-five percent of the world’s forested areas are in the t...
Pereira, B.F., Ribeiro, V.C., Araújo, J.A. Projeto Cachoeiras : cartografia social e histórias orais ao longo do rio Paraíba do Sul: Cunha. Caderno 01. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Campos (...
Pereira, B.F., Ribeiro, V.C., Araújo, J.A. Projeto Cachoeiras : cartografia social e histórias orais ao longo do rio Paraíba do Sul: São Luiz do Paraitinga. Caderno 02. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São...
Ribeiro, V.C., Pereira, B.F., Araújo, J.A. Projeto Cachoeiras : cartografia social e histórias orais ao longo do rio Paraíba do Sul: Paraibuna. Caderno 03. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Camp...
Araújo, J.A, Ribeiro, V.C., Pereira, B.F. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: Santa Branca. Caderno 04. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Cam...
Araújo, J.A, Ribeiro, V.C., Pereira, B.F. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: São José dos Campos. Caderno 05. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José...
Ribeiro, V.C., Pereira, B.F., Araújo, J.A. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: Resende. Caderno 07. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Campos...
Pereira, B.F., Ribeiro, V.C., Araújo, J.A. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: Além Paraíba. Caderno 09. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Ca...
Araújo, J.A, Ribeiro, V.C., Pereira, B.F. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: Caçapava. Caderno 06. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Campos...
Ribeiro, V.C., Pereira, B.F., Araújo, J.A. Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul: Três Rios. Caderno 08. In: Medeiros, L.C.C., Iwama, A.Y., Pacheco, F.S., Miranda, M.A.C.N. (Orgs.). Projeto Cachoeiras: cartografia social e histórias orais ao longo do rio Paraíba do Sul. 1ª edição: São José dos Campo...
Resumo O Jatos de Baixo Nível Noturno (JBNN) é geralmente formado na transição da camada limite diurna e noturna e caracterizado por ventos intensos e persistentes na baixa atmosfera. Em setembro de 2016 foi observado na região do reservatório de Furnas-MG um caso de vento intenso (8 m/s) e persistente (12 h) que motivou o desenvolvimento deste tra...
A detailed mass balance that evaluates nutrient inputs and outputs is fundamental to determining the most promising strategies to mitigate eutrophication and its undesirable effects. However, such analyses are rare in Brazilian urban ponds where water quality impairment remains a significant issue. We performed a mass balance to identify the main p...
Understanding the variation in community composition and species abundances, i.e., β-diversity, is at the heart of community ecology. A common approach to examine β-diversity is to evaluate directional turnover in community composition by measuring the decay in the similarity among pairs of communities along spatial or environmental distances. We p...
Agricultural systems play a key role in achieving many of the Sustainable Development Goals, established by the United Nations, given the current challenge of producing enough food to feed a global population that is expected to reach 10 billion people by 2050. More efficient and sustainable use of nutrients in agriculture is an important step to i...
The activities related to the International Nitrogen Initiative (INI) Latin America Regional Centre started in the early 2000s, in association with the international actions within the nitrogen (N) field. The office in Latin America was proposed in the context of broad global and local environmental changes and the agricultural need for nutrient ad...
River damming reduces the dispersal rates of biota and filter species by altering the local environmental conditions. Although phytoplankton is a key biotic group to indicate changes in aquatic environments, the effects of river damming on the longitudinal distribution of phytoplankton communities are not widely addressed. Here we investigated the...
Peatlands are carbon‐rich ecosystems that cover 185‐423 million hectares of the earth’s surface. The majority of the world’s peatlands are in temperate and boreal zones, whereas tropical ones cover only a total area of 90‐170 million hectares. However, there are still considerable uncertainties in C stock estimates as well as a lack of information...
Biological nitrogen fixation (BNF) supports terrestrial primary productivity and plays key roles in mediating human-induced changes in global nitrogen (N) and carbon cycling. However, there are still critical uncertainties in our understanding of the amount of BNF occurring across terrestrial ecosystems, and of how terrestrial BNF will respond to g...
Estimates of nitrogen deposition play a key role in better understanding the human impacts on the nitrogen biogeochemical cycle. This paper examines the concentration of reactive nitrogen (Nr) in the atmosphere and the average dry deposition in the state of São Paulo, Brazil. The Nr species that were measured were in the gaseous (NO2, NH3 and HNO3)...
Resumo. Nitrogênio (N) e fósforo (P) são essenciais para manutenção da produtividade agrícola e pecuária, mas, quando em excesso no ambiente, são responsáveis por uma diversidade de impactos negativos, que ameaçam os ecossistemas, a saúde e o bem-estar humano. Na bacia do Alto Paraguai (BAP), o avanço das atividades antrópicas em cabeceiras de rios...
The impacts of the fast changes on the nitrogen cycle in LA and the interactions with other altered biogeochemical cycles are still open issues. Understanding the current impact of altered nitrogen fluxes to terrestrial and aquatic ecosystems, with key linkages to food and water security, ecosystems, and human health, is critical in the region. We...
Run-of-river dams are often considered to have lower environmental impacts than storage dams due to their smaller reservoirs and low potential for flow alteration. However, this has been questioned for projects recently built on large rivers around the world. Two of the world’s largest run-of-river dams—Santo Antônio and Jirau—were recently constru...
The exponential growth of human activities has been significantly altering the global Nitrogen (N) cycling. Due to the scale of these changes, integrated approaches are required to optimize nutrient cycles to meet food and energy demands, while minimizing threats to climate, ecosystem services, and human health. Brazil is now in a leading position...
The exponential growth of human activities has been significantly altering the global Nitrogen (N) cycling. Due to
the scale of these changes, integrated approaches are required to optimize nutrient cycles to meet food and energy
demands, while minimizing threats to climate, ecosystem services, and human health. Brazil is now in a leading
position...
This study presents novel results about ocean-atmosphere CO2 exchanges based upon novel direct in situ measurements of turbulent fluxes using the eddy covariance (EC) methodology. This study was carried out on the Southeast coast of Brazil and the adjacent open ocean during two days of the austral winter of 2015, on board the RV Vital de Oliveira....
Sunscreen agents and in particular UV filters are compounds added in different cosmetic formulations, that has the function of preventing damage caused by sun exposition. Therefore, this paper proposes the development of a simple, fast and reliable electroanalytical method utilizing square wave voltammetry (SWV) to the determination of Benzophenone...
Changes in natural environments caused by human activities through land use and land cover changes (LUCC) have increased during the last three centuries. LUCC is a key sector of climate change, and it is responsible for an important amount of greenhouse gas (GHG) emissions. Agriculture, Forestry, and Other Land Use (AFOLU) activities were responsib...
We tested the hypothesis that a combination of coagulant and ballast could be efficient for removal of positively buoyant harmful cyanobacteria in shallow tropical waterbodies, and will not promote the release of cyanotoxins. This laboratory study examined the efficacy of coagulants [polyaluminium chloride (PAC) and chitosan (made of shrimp shells)...
Large Amazonian rivers are characteristically subject to seasonal floods. We examine how inundation extent affects the partial pressure of carbon dioxide (pCO2) and CO2 outgassing in the Madeira River, a large tributary to the Amazon River. We show data from nine field campaigns performed between 2009 and 2011, complemented with data from one addit...
Urbanization and land use changes alter the nitrogen (N) cycle, with critical consequences for continental freshwater resources, coastal zones, and human health. Sewage and poor watershed management lead to impoverishment of inland water resources and degradation of coastal zones. Here we review the N contents of rivers of the three most important...
Much research has been devoted to understanding the complexity of biogeochemical and physical processes responsible for the greenhouse gas (GHG) emissions from hydropower reservoirs. Spatial complexity and heterogeneity of GHG emission may be observed in these systems because it is dependent on flooded biomass, river inflow, primary production and...
Satellite tracked drifters were deployed in order to study the horizontal transport and dispersion in the epilimnion of a large hydroelectric reservoir. Our study was motivated by the dispersion implications on the reservoir surface process, such as larval dispersion, turbulent mixing, point-source fertilizer, dispersion of pollutants, and many oth...
The plunge point is the main mixing point between river and epilimnetic
reservoir water. Plunge point monitoring is essential for understanding
the behavior of density currents and their implications for reservoir.
The use of satellite imagery products from different sensors (Landsat TM
band 6 thermal signatures and visible channels) for the charac...
The plunge point locates the main point of mixing between river and the epilimnion reservoir water. The plunge point monitoring is essential to understand how it will be the behavior of density currents and its implications for reservoir. The applicability of satellite imagery products from different sensors (Landsat TM band 6 thermal signatures an...
As well documented by the scientific literature and strongly stated by the Intergovernmental Panel on Climate Change (IPCC), changes in the atmosphere composition, due to increasing emissions of greenhouse gases (GHG), may result in drastic environmental consequences, both in a regional and in a global scale. A substantial portion of the annual GHG...
In natural lakes inflows are usually restricted to overland flow and small streams. Their impact is usually confined to the littoral zone and surface waters. In contrast, in reservoirs, the largest inflow is usually at the reservoir entrance in the transition zone of the dammed river, and it can have a far larger impact in the reservoir hydrodynami...
The lakes and reservoirs morphometry as surface shape, surface area, underwater form, depth, and the irregularity of their shoreline have a major impact on turbulence, water stratification, sedimentation and resuspension, and the extent of littoral-zone wetlands that determine lake and reservoir functioning. The degree of irregularity is most frequ...
One of the most important advantages of Remote Sensing is its capability in enable us to study natural process in a synoptic frame. Despite of this important advantage, the correctly interpretation and comprehension of the remote sensing product not always is easy and normally require long time experience for its correctly interpretation. In this w...
