Spatial Gradient
Mostrando 1-12 de 183 artigos, teses e dissertações.
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1. Macrophyte functional composition is stable across a strong environmental gradient of a Neotropical floodplain
ABSTRACT Ecological communities are compared by the similarity or distinctness of their species. Taking into account community composition at a determined site, one could expect a similar reasoning to explain differences in both taxonomic and functional composition due to environmental gradients. We aim to evaluate spatial variation in functional composition
Acta Bot. Bras.. Publicado em: 2021-03
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2. Variation in root morphology of epiphytic orchids along small-scale and large-scale moisture gradients
ABSTRACT Root morphology is expected to respond to environmental conditions. Two earlier studies reported predictable changes in the structure of the velamen radicum (common in monocotyledons) along rainfall gradients, which was expected from its assumed role in plant-water-relations. The present study expanded on this idea by analysing nine root traits that
Acta Bot. Bras.. Publicado em: 2020-03
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3. Land-use influence on the soil hydrology: An approach in upper Grande River basin, Southeast Brazil
RESUMO A Bacia do Alto Grande (ARG) é responsável pela drenagem de vários rios no sudeste do Brasil, sendo uma região hidrológica de grande importância para o Sistema Elétrico Brasileiro. Portanto, estudos sobre a disponibilidade de água nesta região são indispensáveis para uma melhor tomada de decisão na gestão dos recursos hídricos. O objetiv
Ciênc. agrotec.. Publicado em: 09/12/2019
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4. Variation in root morphology of epiphytic orchids along small-scale and large-scale moisture gradients
ABSTRACT Root morphology is expected to respond to environmental conditions. Two earlier studies reported predictable changes in the structure of the velamen radicum (common in monocotyledons) along rainfall gradients, which was expected from its assumed role in plant-water-relations. The present study expanded on this idea by analysing nine root traits that
Acta Bot. Bras.. Publicado em: 11/11/2019
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5. Spatial distribution of wood volume in Brazilian savannas
Abstract: Here we model and describe the wood volume of Cerrado Sensu Stricto, a highly heterogeneous vegetation type in the Savanna biome, in the state of Minas Gerais, Brazil, integrating forest inventory data with spatial-environmental variables, multivariate regression, and regression kriging. Our study contributes to a better understanding of the factor
An. Acad. Bras. Ciênc.. Publicado em: 21/10/2019
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6. Habitat, limnological signatures and spatial modeling: a zoning proposal for the Curuá-Una hydroelectric reservoir, Pará, Brazil
Resumo Objetivo O objetivo deste trabalho é caracterizar, modelar espacialmente e realizar o zoneamento do ambiente aquático no reservatório da UHE de Curuá-Una, no estado do Pará, na Amazônia brasileira. Métodos Os dados foram coletados em 77 pontos amostrais distribuídos em 20 transectos no reservatório de Curuá-Una, no mês de novembro de 20
Acta Limnol. Bras.. Publicado em: 05/09/2019
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7. A predictive multimetric index based on macroinvetebrates for Atlantic Forest wadeable streams assessment
Resumo: Índices Multimétricos (MMIs) são ferramentas amplamente aplicadas ao monitoramento ecológico de ecossistemas aquáticos continentais. A maior dificuldade na utilização dos MMIs em amplas escalas espaciais consiste no aumento da variabilidade ambiental associado ao aumento da escala. A covariância entre os impactos antropogênicos e o gradiente
Biota Neotrop.. Publicado em: 16/05/2019
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8. A snapshot of the limnological features in tropical floodplain lakes: the relative influence of climate and land use
Resumo Objetivo O objetivo desse estudo foi investigar a influência relativa do clima (temperatura e precipitação) e do uso da terra nas características limnológicas de 30 lagoas da planície de inundação do Rio Araguaia, no Brasil Central, um importante rio que drena no Cerrado brasileiro. Métodos As lagoas foram amostradas em um mesmo período,
Acta Limnol. Bras.. Publicado em: 07/03/2019
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9. Distribution of aquatic macrophytes along depth gradients in Lajeado Reservoir, Tocantins River, Brazil
Resumo Objetivo O presente estudo investigou a diversidade de macrófitas aquáticas na zona litorânea do reservatório de Lajeado, rio Tocantins. O objetivo principal foi caracterizar variações espaciais na riqueza de espécies, composição e abundância em gradientes de profundidade. Métodos A amostragem de macrófitas ocorreu no final do período
Acta Limnol. Bras.. Publicado em: 18/02/2019
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10. Large-Scale Spatial and Temporal Variability of Larval Fish Assemblages in the Tropical Atlantic Ocean
Abstract This study investigated the large-scale spatial and temporal variability of larval fish assemblages in the west tropical Atlantic Ocean. The sampling was performed during four expeditions. Identification resulted in 100 taxa (64 families, 19 orders and 17 suborders). During the four periods, 80% of the total larvae taken represented eight characteri
An. Acad. Bras. Ciênc.. Publicado em: 14/02/2019
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11. EBSD Analysis of Orientation Gradients Developed near Grain Boundaries
The local misorientation and orientation gradient development near grain boundaries (GBs) are analyzed in a deep drawing quality steel sheet (AKDQ) subjected to interrupted tensile tests in a notched sample. The microstructure is studied using electron backscatter diffraction (EBSD) with subgrain-level spatial resolution. The evolution of misorientation accu
Mat. Res.. Publicado em: 10/01/2019
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12. Zooplankton community attributes in an oligo-mesotrophic reservoir: A comparative study of two sampling strategies
Abstract Studies of the limnetic zooplankton in Brazilian freshwater have been done using several sampling strategies which are frequently associated to personal preferences, system constraints and objectives of the studies. It is known that a better sampling technique exists for each group of investigated zooplankton. So, the challenge is to provide a good
An. Acad. Bras. Ciênc.. Publicado em: 17/12/2018