Natural Disturbances
Mostrando 1-12 de 52 artigos, teses e dissertações.
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1. Stability Analyses by HPLC-MS of Guanitoxin Isolated from Sphaerospermopsis torques-reginae
Guanitoxin (GNT) is a natural organophosphate produced by some species of freshwater cyanobacteria, which inhibits the active site of acetylcholinesterase, preventing the hydrolysis of cholinesterases and consequently causing serious disturbances in the neuromuscular system. Despite having a chemical structure like synthetic organophosphates, there is still
J. Braz. Chem. Soc.. Publicado em: 2021-08
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2. Do natural disturbances have significant effects on sandy beach macrofauna of Southeastern Brazil?
ABSTRACT The role of morphodynamic features such as grain size, swash climate and wave action on the macrofauna of beaches are well-known. However, few studies have investigated natural disturbances as potential drivers of temporal community variations. In southeastern Brazil, we sampled the intertidal macrofauna of two sandy beaches to test whether seasonal
Zoologia (Curitiba). Publicado em: 08/08/2019
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3. What explains the variation on the regenerative component dynamics of Araucaria Forests in southern Brazil?
ABSTRACT: The natural regeneration process is essential for forest maintenance since it is critical for establishing new tree individuals. This study aimed to improve the understanding of the regenerative component dynamics of Araucaria Forests in Southern Brazil. We investigated the effects of climate, light, tree component structure and anthropogenic distu
Sci. agric. (Piracicaba, Braz.). Publicado em: 20/05/2019
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4. Soil Seed Bank at Different Depths and Light Conditions in a Dry Forest in Northern Minas Gerais
ABSTRACT The soil seed bank is an important natural regeneration strategy for plant communities and can determine floristic composition after disturbances. The aim of the present study was to evaluate the seed bank richness and abundance at different soil depths and under different light conditions in a dry forest. Litter and soil samples were collected at
Floresta Ambient.. Publicado em: 04/04/2019
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5. Effect of Primary Health Care team actions to protect mental health after natural disasters
Abstract Background There is a high prevalence of emotional disturbances in the population exposed to disasters, and primary health care centers (PHC) could contribute to their prevention. Objective To analyze post-catastrophe associations between PHC variables and population mental health variables. Method Study conducted in Chile one year after an 8.
Cad. saúde colet.. Publicado em: 21/09/2018
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6. The Impact of Traditional Silvopastoral System on the Mixed Ombrophilous Forest Remnants
ABSTRACT The results of an evaluation of the impact of traditional silvopastoral system on floristic and phytosociology of the Mixed Ombrophilous Forest (MOF) remnants, named caívas, in the North Plateau of Santa Catarina, South of Brazil are shown here to contribute to a better understanding of the impact of human activities on natural environments,. Ther
Floresta Ambient.. Publicado em: 13/09/2018
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7. What is the importance of open habitat in a predominantly closed forest area to the dung beetle (Coleoptera, Scarabaeinae) assemblage?
What is the importance of open habitat in a predominantly closed forest to the dung beetle assemblage? The Atlantic Forest in Brazil is one of the most highly disturbed ecosystems and is mainly represented by fragmented areas. However, in places where human disturbances have ceased, certain areas are showing a natural regeneration pattern. The aim of the pre
Rev. Bras. entomol.. Publicado em: 2013-09
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8. Pathogenesis of chronic Chagas cardiomyopathy: the role of coronary microvascular derangements
There is ample experimental and clinical evidence of functional and structural microvascular abnormalities occurring in patients with Chagas cardiomyopathy, possibly due to the inflammatory process and/or autonomic disturbances caused by Trypanosoma cruzi infection. Those microvascular derangements are likely to constitute at least an ancillary factor that p
Rev. Soc. Bras. Med. Trop.. Publicado em: 12/07/2013
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9. Temporal variation in the composition of ant assemblages (Hymenoptera, Formicidae) on trees in the Pantanal floodplain, Mato Grosso do Sul, Brazil
Temporal variation in the composition of ant assemblages (Hymenoptera, Formicidae) on trees in the Pantanal floodplain, Mato Grosso do Sul, Brazil. In this paper we investigate how seasonal flooding influences the composition of assemblages of ants foraging on trees in the Pantanal of Mato Grosso do Sul. During the flood in the Pantanal, a large area is cove
Rev. Bras. entomol.. Publicado em: 2013-03
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10. Temporal variability of fish larvae assemblages: influence of natural and anthropogenic disturbances
Os distúrbios naturais e induzidos têm notável influência na distribuição temporal da abundância do ictioplâncton. Este estudo visa avaliar e comparar a variabilidade temporal das assembleias de larvas de peixes, entre ambientes regulados e ambientes livres, bem como, determinar a influência das variáveis ambientais sobre os principais táxons pres
Neotrop. ichthyol.. Publicado em: 2012-10
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11. Macrolgae as an indicator of the environmental health of the Pirangi reefs, Rio Grande do Norte, Brazil
The coral reefs of Pirangi beach have suffered the impact of anthropic actions, mainly those related to tourism. To evaluate these effects, algal samples were collected at nine stations, distributed along the reef fringe. The macrobenthic community (algae/coral) was identified through photographic methods. A total of thirty species of algae, five species of
Revista Brasileira de Farmacognosia. Publicado em: 22/04/2011
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12. Diversidade de nematóides em agroecossistemas e ecossistemas naturais.
ABSTRACT: In this work, scientific and international literature about nematode diversity is reviewed and discussed. Among multicelular animals, nematodes are the most abundant. They have different feeding habits (plant feeder, fungal feeder, bacterial feeder, predator of animals and omnivore) and many ecological roles in soils. They may be used as soil ecolo
Planaltina. Publicado em: 2011