Paleolimnological evidence of environmental changes in seven subtropical reservoirs based on metals, nutrients, and sedimentation rates
Evidências paleolimnológicas de mudanças ambientais em sete reservatórios subtropicais com base em metais, nutrientes e taxas de sedimentação ABSTRACT Paleolimnological research can shed light on a broad range of environmental concerns; however, such studies are scarce in reservoirs. To address this lack of knowledge, a paleolimnological investigation was conducted to determine historical changes in sedimentation […]
Homogenization of diatom assemblages is driven by eutrophication in tropical reservoirs
A homogeneização de conjuntos de diatomáceas é impulsionada pela eutrofização em reservatórios tropicais ABSTRACT Eutrophication is one of the most widespread causes of biotic homogenization in freshwater ecosystems. Biotic homogenization can be characterized as reductions in local diversity (alpha) and occupation of available niches by more generalist species. Beta diversity is expected to decrease in […]
Dynamic security regions in power systems with active overexcitation limiters
Regiões de segurança dinâmicas em sistemas de energia com limitadores de sobreexcitação ativos ABSTRACT This paper analyzes the impact of active overexcitation limiters (OELs) on the dynamic security assessment of power systems, with focus on transient stability. The analysis is concentrated on dynamic security regions evaluation, considering different OELs types, including the takeover and summed […]
Freshwater neurotoxins and concerns for human, animal, and ecosystem health: A review of anatoxin-a and saxitoxin
Neurotoxinas de água doce e preocupações com a saúde humana, animal e do ecossistema: uma revisão da anatoxina-a e da saxitoxina ABSTRACT Toxic cyanobacteria are a concern worldwide because they can adversely affect humans, animals, and ecosystems. However, neurotoxins produced by freshwater cyanobacteria are understudied relative to microcystin. Thus, the objective of this critical review […]
Improved empirical models for predicting nitrogen retention in lakes and reservoirs
Modelos empíricos aprimorados para prever a retenção de nitrogênio em lagos e reservatórios ABSTRACT Anthropogenic activities have significantly increased the movement of nitrogen (N) from land to freshwaters and to coastal waters and have led to severe environmental consequences. The flow of N is moderated by retention processes in terrestrial, freshwater and marine ecosystems. Freshwater […]
Review of environmental metrics used across multiple sectors and geographies to evaluate the effects of hydropower development
Revisão de métricas ambientais usadas em vários setores e geografias para avaliar os efeitos do desenvolvimento de energia hidrelétrica Introduction The United States of America (U.S.) has a need for renewable and sustainable energy resources that can keep pace with increasing energy demands while minimizing adverse impacts to the environment and preserving quality of life […]
Effects of land use and land cover on water quality of low-order streams in Southeastern Brazil: Watershed versus riparian zone
Efeitos do uso e cobertura do solo na qualidade da água de riachos de baixa ordem no sudeste do Brasil: bacia hidrográfica versus zona ribeirinha ABSTRACT Land-use/land-cover (LULC) pattern influences water quality, however, this relation may be different for various spatial scales. We evaluated the LULC effects on water quality of tropical low-order streams, comparing […]
Chemical weathering rates and atmospheric/soil CO2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil
Taxas de intemperismo químico e consumo de CO2 atmosférico/do solo em rochas ígneas e metamórficas sob clima tropical no sudeste do Brasil. ABSTRACT Chemical weathering rates and atmosphere/soil CO2 consumption of igneous and metamorphic rocks under tropical climate in southeastern Brazil were evaluated using the chemical composition of surface waters and fresh rocks and soil […]
Carrying capacity using emergy and a new calculation of the ecological footprint
Capacidade de suporte usando emergia e um novo cálculo da pegada ecológica ABSTRACT Carrying capacity was evaluated using emergy assessment to improve the diagnosis of problems and tomake understanding sustainability easier, thereby supporting the formulation of public policies. IbiúnaCounty has an area of 105,800 hectare (ha) and it is located 72 km west of São […]
Explorando os sistemas de produção hortícola sustentável usando a avaliação emergética para restaurar a sustentabilidade regional (2014)
Exploring the sustainable horticulture productions systems using the emergy assessment to restore the regional sustainability Elisa Sayoko Nakajima e Enrique Ortega RESUMO Este artigo mostra o comportamento ambiental de diferentes sistemas de produção hortícola. A avaliação emergética foi aplicada para a análise de três fazendas hortícolas familiares localizadas no Condado de Ibiúna e um subsistema hortícola da Ecovila […]