Navegando por Assunto "Rio Xingu - PA"

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Acesso aberto (Open Access)
Análise integrada da morfologia e sedimentologia do baixo curso do rio Xingu
(Universidade Federal do Pará, 2019-01-28) SILVA, Ariane Maria Marques da; ASP NETO, Nils Edvin; http://lattes.cnpq.br/7113886150130994
The Xingu River is an important tributary of the Amazon River, contributing with 5% of its total water discharge. Nevertheless, it does not contribute substantially with sediment load. The lower reaches of the Xingu River correspond to a Ria, as a result of the Holocene sea-level rise. It is also classified as a tidal river, where tides reach over 1 m at its confluence with the Amazon River. This study evaluated the morphology and sedimentology of the area, correlating it with hydrodynamics, aiming to understand the still ongoing infilling process of the Xingu Ria. The study area encompasses a stretch of about 180 km, from the Xingu-Amazon river confluence upward to the narrowing of the channel, near the city of Vitória do Xingu. During the maximum sediment discharge of the Amazon River (i.e., feb/2016) 109 bottom sediment samples were collected, whereas 11 of the sampling sites were re-sampled during the minimum water discharge period of both rivers (i.e., nov/2016). During the maximum water discharge period of the Amazon River (i.e., jun/2018), additional water level measurements were undertaken simultaneously in several locations along the Xingu River, as it was also performed during the other campaigns. The morphology was evaluated on the basis of the bathymetric surveys of the Brazilian Navy (CLSAOR/DHN), including about 20,000 points. The results showed that the infilling process of the ria lake has taken place from both ‘ends’ of the area- from the Xingu River itself, forming a prominent bay-head delta, as well as from the Xingu-Amazon River confluence, where tides have transported Amazon River sediments upstream into the Xingu Ria. Furthermore, there is a central portion of the ria lake with large cross-sectional areas, reached only by relatively small amounts of sediments, being a quiescent environment within muddy sedimentation. In a transversal perspective, sands seem to prevail along the margins, where local wave action seem to result in bluff erosion. Longitudinally, sands are substantially more frequent at the bay-head delta area, and at the confluence area, where cross-sections are clearly narrower. Results also suggest that the sediment input from the Amazon River into the Xingu ria has reduced over time, whereas the combination of cross-section area variation and the Xingu River water discharge itself reduce the sediment flux from the Amazon River into the Xingu River.
Acesso aberto (Open Access)
Caça e segurança alimentar em comunidades ribeirinhas do médio Xingu
(Universidade Federal do Pará, 2015-01-30) SOUSA, Girlian Silva de; PEZZUTI, Juarez Carlos Brito; http://lattes.cnpq.br/3852277891994862
Hunting is an extremely complex issue, due to the serious impact on the environment, but also because game meat is one of the main sources of animal protein for the traditional Amazonian people. This essay discusses subsistence hunting and the lack of access regarding river communities from the Reserva Extrativista do Rio Iriri to food security policies. It aims to discuss the socioeconomic contribution of subsistence hunting, and to bring evidences of the difficult situation in which these families live while trying to gain access to food products and public services in general. To achieve these goals, this paper embraces the theme from an economic and anthropological perspective, by using ethnographic resources to show evidences of the relations between man and environment, as well as the interaction between the economic sector and the other sectors in social life. For this discussion, the theoretical and methodological support from Maurice Godelier, Karl Polanyi, Pierre Bourdieu, Jorge Gasché Suess and Napoleón Vela Mendoza was used, as well as concepts of microeconomics.
Acesso aberto (Open Access)
A comunidade ictica e suas interrelacões tróficas como indicadores de integridade biológica na área de influencia do projeto hidrelétrico Belo Monte-Rio Xingu, PA
(Universidade Federal do Pará, 2004-04) CAMARGO-ZORRO, Mauricio; ISAAC, Victoria Judith; http://lattes.cnpq.br/3696530797888724
This study presents applied methodologies to better understand the dynamics of mechanisms characterizing a portion of the Xingu River, with respect to fish communities living in that environment. Through the study of the ichthyofauna it is aimed to verify various environmental standard patterns, in order to assess the current conservation state of a part of the Xingu River. Based on surveys of the local ichthyofauna conducted over seasonal variations, analyses were conducted at the specieS, population and trophic guild levels. With regards to the ecological population level, study of biological parameters such as individual growth rates, asymptotic body length, mortality rates and size at first maturity were good indicators for a better understanding of the life history of those fish groups. Therefore a trend was observed in which species of relatively small body size to followed a "r" type strategy, whilw species of larger body sizes would follow the "k" strategy tactics. From a functional point of view, it was verified that guild community structure is not only a good indicator of convergence patterns to similar ecosystems as like the Xingu River studied stretch, but also a tool to assess its conservation status. A steady- state ecosystem model for the medium Xingu River sector indicated that it is a system highly instable, and simultaneusly look like a mature seasonal system. An apparent seasonal restriction of food availability observed in the studied river section could imply optimum use efficiency and transfer of the trophic resources. A biogeographic study was undertaken based on species occurrence in order to conceptualise the River stretch comprised between the confluences of the Iriri and Xingu Rivers up to the vicinity of of the village Senador José Porfirio, in the Xingu basin. By means of this analysis, it was possible to demonstrate that the medium upstream of waterfalls) and lower (downstream) courses of the Xingu River are parts of two endemic areas. The low affinity of species composition observed in these two sectors is attributed to geographic variations in the landscape. Therefore, the boundaries of the waterfalls around the village of Belomonte and the influence of the Amazon River in the lower Xingu course could trigger differences in ichthyofaunal composition and species abundance when compared to the medium course of that river. Finally, the importance of maintaining all hydrologic connectivity is pointed out in order to maintan the unity of the system, from the headwaters to the mouth. Impacts on environmental processes and fish populations in the medium course of the Xingu River as a result of the eventual construction of the Belemonte hydroelectric dam are discussed.
Acesso aberto (Open Access)
Cytogenetic analysis of Baryancistrus xanthellus (Siluriformes: Loricariidae: Ancistrini), an ornamental fish endemic to the Xingu River, Brazil
(Sociedade Brasileira de Ictiologia, 2016) MEDEIROS, Larissa Azevedo de; GURGEL, Eduardo Gentil Ginani; SOUSA, Leandro Melo de; PY-DANIEL, Lúcia Helena Rapp; FELDBERG, Eliana
Baryancistrus xanthellus is a species from the Ancistrini tribe known commonly as "amarelinho " or "golden nugget pleco". It is one of the most popular and valued ornamental fishes due to its color pattern. Also, it is an endemic species from the Xingu River occurring from Volta Grande do Xingu, region where the Belo Monte Hydropower Dam is being built, to São Félix do Xingu. The current study aimed to cytogenetically characterize B. xanthellus . Results point to the maintenance of 2n=52, which is considered the most common condition for the tribe, and a single nucleolus organizer region (NOR). Mapping of the 18S rDNA confirmed the NOR sites, and the 5S rDNA was mapped in the interstitial position of a single chromosome pair. The 18S and 5S rDNA located in different pairs constitute an apomorphy in Loricariidae. Large blocks of heterochromatin are present in pairs 1 and 10 and in the regions equivalent to NOR and the 5S rDNA. Data obtained in this study corroborated with the currently accepted phylogenetic hypothesis for the Ancistrini and demonstrate evidence that the genus Baryancistrus occupies a basal position in the tribe.
Acesso aberto (Open Access)
Das águas do rio, as mulheres em movimento na defesa do Xingu: a resistência contra a construção da hidrelétrica de Belo Monte em Altamira - Oeste do Pará
(Universidade Federal do Pará, 2010-06) PAIVA, Angela Maria Trindade; CANCELA, Cristina Donza; http://lattes.cnpq.br/8393402118322730; SILVEIRA, Flávio Leonel Abreu da; http://lattes.cnpq.br/1972975269922101
The complex issues surrounding the conflicts in the construction of hydroelectric dam involving, on the one hand, the Brazilian Electric Sector, and on the other, segments of society such as indigenous peoples, “traditional populations”, riverside living, fishermen and also the populations of urban areas, among others, have been recurrent in the last few decades. To some extent, we can indicate that such conflicts arise from different and contradictory ways in which these segments of society see, experience and use the nature and their environment. Motivated by the interest of deepening the analysis on these conflicts in the Amazon region, and expand my knowledge, sustained by the interpretative matrix of making and anthropological thinking, underpin the development of this work focusing on the dialogue with twelve women who acts as a group articulated in defense of the Xingu’s river and therefore against the Belo Monte hydroelectric dam, scheduled to be built in the western state of Para. To this group of "Women of the Xingu" the building of the hydroelectric dam will bring environmental and social impacts, that they understand as detrimental to the entire region, but especially for women who lives in that region. In this sense, we wish to understand the peculiarities that elapse from this way of seeing and the meaning of world which leads these women to do this reading and articulated political acts in defense of the nature.
Acesso aberto (Open Access)
Descrição cariotípica de peixes dos gêneros Baryancistrus, Parancistrus, Peckoltia e Ancistrus (Ancistrinae, Loricariidae) da Bacia Amazônica
(Universidade Federal do Pará, 2003-06-13) SOUZA, Augusto Cesar Paes de; PIECZARKA, Julio Cesar; http://lattes.cnpq.br/6644368250823351
The subfamily Ancistrinae is one of the most diversified among Loricariidae fish, including approximately 200 species, distributed in 26 genera. These fish are easily recognized by the presence of bony plates arranged in series along the body, and by the antero-ventral position of the mouth. Their common names are acaris, bodós, cascudos and sucker-mouth. Species of the subfamily Ancistrinae comprise an important social-economic resource, constituting one of the most important commercial activities in Altamira-PA. In this study, the karyotype of nine species of fish belonging to four different genera (Baryancystrus, Parancistrus, Peckoltia and Ancistru,$) of the subfamily Ancistrinae were analyzed through conventional (Giemsa, C-band and Ag-NORs) and fluorochrome (Chromomycin A3) techniques. The species of the genus Baryancistrus showed a diploid number 2n= 52, and FN=104. NORs were found in an interstitial position of the short arm of a biarmed chromosome. The species B. aff niveatus had large blocks of constitutive heterochromatin, rich in G-C. This character was considered apomorphic. Hence, the karyotype of this species was considered the most derived among the species of this genus. Genus Parancistrus includes species with a karyotypic structure very similar to the one found in Baryancistrus, and the position of NORs could be considered as a possible apomorphy shared by these two genera. The species of the genus Peckoltia showed a diploid number with 52 chromosomes, and FN=102, with large heterochromatic blocks in ali the species. These blocks comprised almost ali the long arras of some submetacentric and subtelocentric chromosome pairs, which could be considered as a possible apomorphy shared by the species of this group. NORs were found in the long arm of a submetacentric pair in P. vittata, and in the maximum of three chromosomes in Peckoltia spl and Peckoltia sp2. Ancistrus ranunculus showed the most derived karyotype among all the species analyzed in this study. This karyotype had 48 chromosomes and FN=80. Cytogenetic analyses so far suggest that inversions were the most important rearrangement that occurred during the chromosomal diversification of Ancistrinae, except in Ancistrus ranunculus, in which Robertsonian rearrangements were also observed.
Acesso aberto (Open Access)
Desenvolvimento e socioambientalismo: uma análise do discurso jornalístico de O Liberal e Diário do Pará sobre a Usina Hidrelétrica de Belo Monte
(Universidade Federal do Pará, 2012-07-24) SILVA, Josiele Sousa da; COSTA, Luciana Miranda; http://lattes.cnpq.br/1310961057480638
The debate on Belo Monte Hydroelectric construction feasibility, in Xingu region of Pará state, came back to the pages of two major newspapers in Pará, O Liberal and Diário do Pará, after 30 years of project creation by the federal government of Brazil. In the period from May, 5th 2009 to set, 30th 2010, the publications reconstructed the established combat atmosphere among various social agents and institutions about the hydroelectric project, publishing 475 newspaper articles on the subject, considering editorials, interviews, articles, notes, headlines, factual news and reports. To understand the communication process/discursive production and repetition of meanings embodied in the journalistic texts, it opted for the French methodology of discourse analysis, with attention to the relationship between communication and discourse, presented discursive formations in the texts as well as the expression of interdiscursivity. The result of the analysis, exemplified by the presentation of discursive sequences, taken from 32 selected texts of the main body and divided into subthemes, showed that there is a predominance of the development discourse at the expense of social and environmental discourse, with strong links to other speeches already said about Amazon. This is still seen as a place full of riches to be exploited and to serve the interests outside the region. It is also evident the appreciation of officials statements and conservationist NGO representatives, artists and researchers. The Forest Folks remain in a visibility lower level in the reconstruction of the controversy about Belo Monte Hydroelectric.
Acesso aberto (Open Access)
Identidade multifacetada: a reconstrução do "ser indígena" entre os Juruna do médio Xingú
(Universidade Federal do Pará, 2005-04-28) SARAIVA, Márcia Pires; SIMONIAN, Ligia Terezinha Lopes; http://lattes.cnpq.br/6620574987436911
The Juruna Indians have inhabited the valley of the Xingu River, and as it can be proved, since the 17th Century. After successive interethnic contacts, they went through decharacterization processes from a cultural point view. Nowadays, they find themselves living in varying sociospacial situations, as those who inhabit Paqui?amba Indigenous Land, those who are located on the Great Bend of the Xingu, and others who live in the periphery of the city of Altamira, Pará State, Brazil. Recently, the Juruna have strived to be considered as a legitimate indigenous identity, which is achieved through documents and orality about their history, and rites and diverse artistic manifestations, which is the main focus of this work. The research reveals the constitution of a multifaceted identity, which is driven by various realities in which they are involved.
Acesso aberto (Open Access)
Length-weight relationships and condition factor of the eaglebeak pacu Ossubtus xinguense Jégu, 1992 (Characiformes, Serrasalmidae), an endangered species from Rio Xingu rapids, northern Brazil
(Universidade Federal do Pará, 2015-08) ANDRADE, Marcelo Costa; JESUS, Allan Jamesson Silva de; GIARRIZZO, Tommaso
This study reports on the length-weight relationships and condition factor for the endangered rheophilic fish Ossubtus xinguense Jégu from Rio Xingu rapids. This species is threatened by construction of the third largest hydroelectric in the world, the Belo Monte dam close to the city of Altamira, northern Brazil. Specimens were collected in the dry season between July 2012 and September 2012. Male specimens have body length larger than females, atypical in serrasalmid fishes, and different length-weight relationships were found between adult and juvenile specimens. This study presents the first biological characteristics for O. xinguense.
Acesso aberto (Open Access)
Levels of As, Cd, Pb and Hg found in the hair from people living in Altamira, Pará, Brazil: environmental implications in the Belo Monte area
(2009) CARVALHO, Antonio Sergio Costa; SANTOS, Alberdan Silva; PEREIRA, Simone de Fátima Pinheiro; ALVES, Claudio Nahum
Human hair was used as a bioindicator to evaluate the levels of As, Cd, Pb and Hg in the resident population of the "Volta Grande" area of the Xingu river, in the North of Brazil. The concentrations of As and Cd are in agreement with the values found in the literature, however, the Pb and Hg concentration is very different, which can suggest an inter-regional variation. Moreover, the high values found for these elements in the residents of the Canteiro Island can be attributed to environmental exposure of this population in an area with environmental impact from activities of gold mining. The application of these methods showed that the concentrations of the metals studied in this work can correctly classify two different localities in the Altamira district. The results reflect the impact of these elements on the health of the inhabitants of this auriferous area.
Acesso aberto (Open Access)
Previsão hidrológica de cheia sazonal do rio Xingu em Altamira-PA
(Universidade Federal do Pará, 2014-05-26) FRANCO, Vânia dos Santos; SOUZA, Everaldo Barreiros de; http://lattes.cnpq.br/6257794694839685
Hydrologic models can be considered as a tool developed to represent the behavior of the hydrographic basin, predict future conditions and/or simulate hypothetic situations with the intent of evaluatins impacts of alterations. The socioeconomic impacts these of alterations (flooding; for example), and natural disasters normally affect less favored population groups. The present work investigated the climatologic aspects of the hydrologic regime of the river Xingu, including the elaboration of a statistical model for the prediction of seasonal floods in the municipality of Altamira-PA. In addition, it investigates the degree of social vulnerability associated to these conditions of floods in the municipality of Altamira. The results showed that a peak of floods occurs between the months of March and May (MAM) and the gaging variability is dependent of precipitation at the Xingu (in the states of Pará and Mato Grosso), as well of the pattern Pacific and Atlantic TSS that influence the bands of convective clouds of the ASCZ and ITCZ. The statistical hydrologic prediction model of the Xingu River in Altamira-PA, developed through multiple linear regression, presented significant correlation between variables, value considered adequate and good for coefficient Nash and Sutcliffe and low error to predict the quota of seasonal floods (MAM) of the municipality, taking in to account the predictor variables (explanatory) TSS and precipitation, because accompanied the observed quota. Through the index of social vulnerability (IVS) the vulnerability of Altamira in 2000 census as moderate write ik 2010 it was as low rated, what May not correspond to the current situation of the municipality given the construction of the Belo Monte Hydroelectric Plant.
Acesso aberto (Open Access)
Processos de ocupação nas novas fronteiras da Amazônia: o interflúvio do Xingu/ Iriri
(2005-08) ESCADA, Maria Isabel Sobral; VIEIRA, Ima Célia Guimarães; KAMPEL, Silvana Amaral; SANTOS, Roberto Araújo de Oliveira; VEIGA, Jonas Bastos da; AGUIAR, Ana Paula Dutra; VEIGA JUNIOR, Iran Pereira; OLIVEIRA, Myriam Cyntia Cesar de; PEREIRA, Jorge Luís Gavina; CARNEIRO FILHO, Arnaldo; FEARNSIDE, Philip Martin; VENTURIERI, Adriano; CARRIELLO, Felix; THALÊS, Marcelo Cordeiro; CARNEIRO, Tiago Garcia de Senna; MONTEIRO, Antônio Miguel Vieira; CÂMARA, Gilberto
This work presents the first results achieved through an interdisciplinary and multi-institutional effort conduct by the Geoma Network, aiming to advance in the comprehension of the new frontiers in the South of the Pará State, in the Amazonian region, by examining the new patterns of deforestation and the underlying processes that are generating them. Our objective is to product information aiding to draw responsible public policies considering not only one dimension of the problem like roads infra-structure, as usual. Based on the analysis presented here we pointed out that only an integrated solution, that considers the main actors and the organization of economical processes in the productive chains over the region, would be capable to minimize the effects of deforestation and would drive an integrated development policy to the region bringing benefits to forest conservation and the local population.
Acesso aberto (Open Access)
Trabalhadores nos canteiros de obras da UHE Belo Monte-Altamira: condições de saúde e políticas públicas
(Universidade Federal do Pará, 2014-03-12) CONCEIÇÃO, Tânia Sena; ACEVEDO MARIN, Rosa Elizabeth; http://lattes.cnpq.br/0087693866786684
The construction of the Hydroelectric Plant of Belo Monte (HEP) on the Xingu River in Altamira in the state of Pará, in the Amazon, has been the subject of great controversy and debates on various social, institutional and media spaces due to the complexity the impacts that work brings to society, the environment, indigenous peoples, fisherfolk and riparians, resulting in several lawsuits, but also strikes and workers' claim wage improvements, work conditions and health. The study aims through a qualitative and descriptive approach first examine the box of disease among employed workers, and second, to characterize the forms of health care in the city of Altamira, exam notes that the failure of public policy to respond to demands and produce suitability the increase in migratory flows caused by mega project. During fieldwork in the period 09 to 24 July 2013, 25 workers from the construction sites of UHE were interviewed using Form with open and closed questions. The survey focused research sources in newspapers and public and private institutions about the issues related to working conditions and health of workers in the construction sites of the Belo Monte to enable an interpretative scheme that indicate could also propositions towards prevention in worker health.
Acesso aberto (Open Access)
Traditional knowledge and artisanal fishing technology on the Xingu River in Pará, Brazil
(Universidade Federal do Pará, 2015-08) MESQUITA, Esther Mirian Cardoso; NAHUM, Victoria Judith Isaac
In artisanal fishing, the techniques used by a community reflect the characteristics of the natural environment, in particular the distribution and availability of resources, as well as local traditions and customs. However, economic development may result in the loss of these traditions. The present study documents the fishing techniques used by the communities on the Xingu River in the Brazilian state of Pará (Maribel, Altamira, Belo Monte, Vitória do Xingu, Vila Nova, Senador José Porfírio, Porto de Moz, and Gurupá). Interviews were used to investigate traditional local knowledge and the distribution of the different fishing methods within the study area. The local fishers described the use of 12 different types of net, 10 hook and line techniques, and eight kinds of spearfishing. Free diving and scuba diving are also used for the capture of ornamental fish.
Acesso aberto (Open Access)
Usina Hidrelétrica de Belo Monte: o campo de forças no licenciamento ambiental e o discurso desenvolvimentista dos agentes políticos
(Universidade Federal do Pará, 2011-06-15) NASCIMENTO, Sabrina Mesquita do; CASTRO, Edna Maria Ramos de; http://lattes.cnpq.br/4702941668727146
This dissertation develops an analysis about the dynamic of the field of relationships established around the construction of the Belo Monte dam, seen from the actions undertaken in the licensing process. The main objective was to reveal the logics that organize actions and relations between actors and institutions and determine the course of licensing procedures for the dam. It was evidenced by analysis the weakening of environmental policy instrument, because of the production of a deregulation of rules established to license the build that was identified during the monitoring process. At the same time, the study examines elements and the contents of the discourse that proves the reproduction of developmentalist ideology as the predominant view in national policies for the Amazon. Through literature review, documentary research and field research, the dissertation shows that those who mobilizes a huge political capital in favor of the project and have more power within the field of relationships are the agents and institutions closer to the issues identified as strategic development policies. In this context, according to the reflections produced in this work, the imbalance between the strength of institutions like the Casa Civil, Ministério de Minas e Energia, Setor Elétrico Brasileiro, Ibama, Ministério Público e Movimentos Sociais mark the production of deregulation of environmental licensing at the expense of distorted use of the instruments contained therein and concepts which base its conduction. The result of this weakening will be reflected in the form of an institutionalized irresponsibility on a broader set of rights in the present legal order and in the democratic regime in Brazil.
Acesso aberto (Open Access)
Variação espaço-temporal do zooplâncton em diferentes ambientes do médio Rio Xingu-PA
(Universidade Federal do Pará, 2008-02-29) BRITO, Stélio Ângelo da Costa; MELO, Nuno Filipe Alves Correia de; http://lattes.cnpq.br/4989238044542736; CAMARGO-ZORRO, Mauricio; http://lattes.cnpq.br/5423657235023988
Spatial and temporal variation studies of the zooplankton in the middle Xingu river Brazil, were made for two insular lakes and fluvial environments. The samples were made in a monthly periodicity along one year. The species diversity, the relative and absolute abundance, the biomass, the secudary production and the functional groups were founded. For all the environments studied, one hundred and sixty six species related to three main groups were recorded: one hundred and forty one species of Rotifera; twenty Cladocera species; five species of Copepoda and another group mainly compose of larval stages of insects. In the dry season the Rotifera registered the main density, and during the wet season the low. By the rarefaction curves were detected that the Pimental Lake, and the slow and rapid waters in the main channel show not asymptotic curves for the species diversity. In different sense, the Ilha Grande Lake shows the asymptotic curve for the 12 month with 70 species. For the Boa Esperança and Arroz Cru fluvial environments, the mean total density of zooplankton shows a seasonal variation with the main values for the dry season, especially for the Rotifera group. The dry biomass oscillated between 0,063 a 2,2 g.m-2. In the seasonal variation, the Ilha Grande Lake shows the main biomass variation with range of 0,39 a 1,2 g.m-2 during the wet season and 0,66 g.m-2 during the dry season. A similarity analysis indicated a 35% for all the environments studied in the seasonal variation, with seven similar groups identified. The group G included the Pimental Lake in the wet season as more dissimilar. A SIMPER analysis shows a high mean internal similarity (58%) between the rapid environments during the wet season. The slow river waters with a mean similarity of 48% and, finally lakes with an internal similarity of only 23%. The main dissimilarity was founded for the rapids and lakes environments, during the wet season (70%). A bi-factorial analysis not shows significant differences between the environments studied (ANOSIM r = 0,263; P = 0,2). The Lakes show zooplankton communities statistically different of other environments in the middle Xingu river. The detritivore, filter and omnivore feeding habits predominated in the more abundant forms. In summary, the aquatic environments in the Xingu river, show a pattern of main diversification of Rotifera and Cladocera, which corroborated the founded for another Amazon environments with different types of waters in the Sioli classification. A reduction of the zooplankton viii density related to the wet season, can be associated with the dilution by the waters of the Xingu river, and a perturbation effect in the Lake environments stability.