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| Registros recuperados: 1.113 | |
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| Padoch, Christine; The New York Botanical Garden; cpadoch@nybg.org; Brondizio, Eduardo; Dept. of Anthropology, Anthropological Center for Training and Research on Global Environmental Change, Center for the Study of Institutions, Population, and Environmental Change, Indiana University; ebrondiz@indiana.edu; Pinedo-Vasquez, Miguel; Center for Environmental Research and Conservation and Dept. of Ecology, Evolution, and Environmental Biology, Columbia University; map57@columbia.edu; Sears, Robin R.; Center for Environmental Research and Conservation, Columbia University; The School for Field Studies; sears.robin@gmail.com; Siqueira, Andrea; Center for Latin American & Caribbean Studies and ACT - Dept. of Anthropology, Indiana University; asigueir@indiana.edu. |
| In much of the Amazon Basin, approximately 70% of the population lives in urban areas and urbanward migration continues. Based on data collected over more than a decade in two long-settled regions of Amazonia, we find that rural–urban migration in the region is an extended and complex process. Like recent rural–urban migrants worldwide, Amazonian migrants, although they may be counted as urban residents, are often not absent from rural areas but remain members of multi-sited households and continue to participate in rural–urban networks and in rural land-use decisions. Our research indicates that, despite their general poverty, these migrants have affected urban markets for both food and construction materials. We present two... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Afforestation; Amazonia; Deforestation; Rural– Urban migration; Urban– Rural interactions. |
| Ano: 2008 |
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| Almekinders, Conny J. M.; Knowledge, Technology and Innovation Group, Wageningen University; conny.almekinders@wur.nl; Stomph, Tjeerd-Jan; Centre for Crop Systems Analysis, Wageningen University; tjeerdjan.stomph@wur.nl; Struik, Paul C.; Centre for Crop Systems Analysis, Wageningen University; paul.struik@wur.nl. |
| We evaluated farmers’ rationales to understand their decision making in relation to the use of fertile anthropogenic soils, i.e., Amazonian dark earths (ADE), and for dealing with changes in shifting cultivation in Central Amazonia. We analyzed qualitative information from 196 interviews with farmers in 21 riverine villages along the Madeira River. In order to decide about crop management options to attain their livelihood objectives, farmers rely on an integrated and dynamic understanding of their biophysical and social environment. Farmers associate fallow development with higher crop yields and lower weed pressure, but ADE is always associated with high yields and high weeding requirements. Amazonian dark earths are also seen as an opportunity... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Amazonia; Amazonian dark earths; Decision making; Intensification; Slash and burn; Swidden cultivation; Terra preta. |
| Ano: 2016 |
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| Coomes, Oliver T.; Department of Geography, McGill University; oliver.coomes@mcgill.ca; Takasaki, Yoshito; Graduate School of Economics, University of Tokyo; takasaki@e.u-tokyo.ac.jp; Rhemtulla, Jeanine M.; Department of Forest & Conservation Sciences, University of British Columbia; jeanine.rhemtulla@ubc.ca. |
| Can social inequality be seen imprinted in a forest landscape? We studied the relationship between land holding, land use, and inequality in a peasant community in the Peruvian Amazon where farmers practice swidden-fallow cultivation. Longitudinal data on land holding, land use, and land cover were gathered through field-level surveys (n = 316) and household interviews (n = 51) in 1994/1995 and 2007. Forest cover change between 1965 and 2007 was documented through interpretation of air photos and satellite imagery. We introduce the concept of “land use inequality” to capture differences across households in the distribution of forest fallowing and orchard raising as key land uses that affect household welfare and the sustainability of... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Amazonia; Land inequality; Land use and land cover change; Path dependency; Secondary forests. |
| Ano: 2016 |
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| Cunha,Williana T. R.; Santos,Rita C. O.; Araripe,Juliana; Sampaio,Iracilda; Schneider,Horacio; Rêgo,Péricles S.. |
| Abstract In the present study, we investigated the possible existence of new lineages of peripatids through comparisons between known Neotropical species and specimens obtained from two locations in Pará, a state in eastern Brazilian Amazonia using a molecular approach based on sequences of the mtDNA genes COI, 16Sr RNA, and 18S RNA. The analyses included also sequences of Asian and African taxa for a more systematic understanding of the phylogenetic relationships within the group. The analysis of the COI, 16S rRNA and 18S RNA sequences permitted the identification of three distinct lineages (A, B and C) based on two different phylogenetic approaches (Bayesian methods and ML). The three lineages presented here are completely distinct from all other... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonia; New lineages; Peripatidae; Phylogeny; Onychophora. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000100147 |
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| Bastos,Heitor B.; Gonçalves,Evonnildo C.; Ferrari,Stephen F.; Silva,Artur; Schneider,Maria Paula C.. |
| We genotyped 15 microsatellite loci in order to evaluate the effects of habitat fragmentation, caused by flooding of the Tucuruí reservoir, on the genetic structure of Alouatta belzebul in eastern Amazonia. The analysis included two populations sampled in 1984, representing both margins of the Tocantins river, and three populations sampled 18 years later. Minimal differences in the diversity levels between present-day (Ho = 0.62-0.69 and A R = 6.07-7.21) and pre-flooding (Ho = 0.60-0.62 and A R = 6.27-6.77) populations indicated there was no significant loss of genetic variability, possibly because of successful management strategies applied during the flooding. The changes observed were limited to shifts in the composition of alleles, which presumably... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alouatta belzebul; Amazonia; Conservation; Genetic structure; Habitat fragmentation. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400027 |
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| Iketani,Gabriel; Pimentel,Luciana; Silva-Oliveira,Glaúcia; Maciel,Cristiana; Valenti,Wagner; Schneider,Horacio; Sampaio,Iracilda. |
| The giant river prawn, Macrobrachium cf. rosenbergii, is one of the most cultivated freshwater prawns in the world and has been introduced into more than 40 countries. In some countries, this prawn is considered an invasive species that requires close monitoring. Recent changes in the taxonomy of this species (separation of M. rosenbergii and M. dacqueti) require a re-evaluation of introduced taxa. In this work, molecular analyses were used to determine which of these two species was introduced into Brazil and to establish the geographic origin of the introduced populations that have invaded Amazonian coastal waters. The species introduced into Brazil was M. dacqueti through two introduction events involving prawns originating from Vietnam and either... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioinvasion; Exotic species; Giant river prawn; Macrobrachium dacqueti; COI; 16S rRNA; Amazonia. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100025 |
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| Luz,Francisco Joaci F.. |
| Boa Vista, capital do Estado de Roraima é composta de uma população muito heterogênea, compreendida por nordestinos, sulistas e amazônidas, que apresentam o hábito da utilização de plantas medicinais em suas manifestações culturais e costumes. Apesar do uso freqüente, as plantas medicinais apresentam cultivo muito incipiente, restringindo-se a canteiros de fundo de quintal e ao cultivo de subsistência em pequenas hortas comerciais. Este trabalho objetivou levantar e identificar as plantas medicinais de uso popular utilizadas em Boa Vista, por meio de informações obtidas com raizeiros, produtores de hortaliças e participantes em curso de plantas medicinais realizado pela Prefeitura Municipal. O trabalho foi realizado de janeiro de 1995 a abril de 1997, e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Planta medicinal; Amazonia; Fitoterapia. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362001000100019 |
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| Registros recuperados: 1.113 | |
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