Results: 20

Calibration of the maximum carboxylation velocity (Vcmax) using data mining techniques and ecophysiological data from the Brazilian semiarid region, for use in Dynamic Global Vegetation Models

Braz. j. biol; 76 (2), 2016
Abstract The semiarid region of northeastern Brazil, the Caatinga, is extremely important due to its biodiversity and endemism. Measurements of plant physiology are crucial to the calibration of Dynamic Global Vegetation Models (DGVMs) that are currently used to simulate the responses of vegetation in fa...

Microturbellarians (Platyhelminthes and Acoelomorpha) in Brazil: invisible organisms?

Braz. j. biol; 76 (2), 2016
Abstract Microturbellarians typically belong to the benthos and may occur in a wide variety of environments. They are abundant in freshwater and marine ecosystems and may occur in moist terrestrial habitats. However, turbellarians are seldom taken into account in studies of biodiversity. Most studies on ...

Traditional knowledge and uses of the Caryocar brasiliense Cambess. (Pequi) by “quilombolas” of Minas Gerais, Brazil: subsidies for sustainable management

Braz. j. biol; 76 (2), 2016
Abstract Local knowledge of biodiversity has been applied in support of research focused on utilizing and management of natural resources and promotion of conservation. Among these resources, Pequi (Caryocar brasiliense Cambess.) is important as a source of income and food for communities living in the C...

Continuity effects on rotifers and microcrustaceans caused by the construction of a downstream reservoir in a cascade series (Iguaçu River, Brazil)

Braz. j. biol; 76 (2), 2016
Abstract This study evaluated changes in the community of rotifers and microcrustaceans associated with the construction of a large and dendritic reservoir in Iguaçu River (Brazil), as the last reservoir of a sequence of five cascading systems. Differences were clear between pre-filling and post-filling...

Effect of temperature on immatures of Stiretrus decastigmus (Hemiptera: Pentatomidae)

Braz. j. biol; 76 (2), 2016
Abstract Stiretrus decastigmus (Herrich-Schaeffer) (Hemiptera: Pentatomidae) is an important predator of the insect pest Microtheca ochroloma Stal (Coleoptera: Chrysomelidae). The present study investigated the pre-imaginal development of S. decastigmus at different temperatures. The temperatures were: 2...

Aspectos ecológicos y distribución geográfica de carrangenophytas

Rev. luna azul; (35), 2012
Las especies carragenófitas están definidas como macroalgas miembro del Phylum Rodophyta, Clase Rodophyceae, Subclase Florideophycidae, Orden Gigartinales. Las especies de mayor importancia comercial a nivel internacional son de los géneros Betaphycus, Eucheuma y Kappaphycus; y a nivel nacional especi...

Influence of environmental variables and anthropogenic perturbations on stream fish assemblages, Upper Paraná River, Central Brazil

Neotrop. ichthyol; 7 (1), 2009
The Ouvidor River, a tributary of the Upper Paraná River, drains areas covered by cerrado vegetation in Central Brazil. We collected data for environmental variables (water temperature, dissolved oxygen, pH, conductivity, turbidity, water velocity, luminosity, channel substrate and width) and anthropoge...

Simulação de estratégias de manejo florestal na Amazônia com o uso do modelo SYMFOR
Simulation of forest management strategies in the Amazon using the SYMFOR model

Acta amaz; 38 (1), 2008
O modelo SYMFOR foi utilizado para simular os processos ecológicos de crescimento, mortalidade e recrutamento e o manejo de uma floresta de terra firme na Amazônia Oriental. Na simulação foram utilizadas todas as árvores com DAP ≥ 5 cm, medidas em 40 parcelas permanentes de 1,0 ha, sendo 36 ex...

Interrogando as teorias sobre o arco-íris
Understanding the theories about the rainbow

Tentar entender as teorias do arco-íris é uma maneira de pensar sobre as argumentações entre a lógica científica e o pensamento mítico na história da ciência. Este trabalho segue três percursos relacionados: primeiramente, expõe um resumo das descontinuidades e recorrências históricas na exp...

Desmatamento na Amazônia: dinâmica, impactos e controle
Deforestation in Amazonia: dynamics, impacts and control

Acta amaz; 36 (3), 2006
O desmatamento na Amazônia procede a um alto ritmo por várias razões, muitas das quais dependem de decisões do governo. O desmatamento leva à perda de serviços ambientais, que têm um valor maior que os usos pouco sustentáveis que substituem a floresta. Estes serviços incluem a manutenção da bi...