Navegando por Assunto "Ilha das Onças - PA"

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Acesso aberto (Open Access)
A atividade pesqueira nas ilhas do entorno de Belém
(Universidade Federal do Pará, 2010) SCHALLENBERGER, Bárbara Heck; FRÉDOU, Flávia Lucena; http://lattes.cnpq.br/4779271407117528
The Amazonian estuary is a region with favorable conditions for productivity, and fishery is an important activity. The islands of Combu, Onças and Mosqueiro, focus of this study, are part of the Amazonian estuary and fishing is an important activity. Based on this information, the objective of this study was to describe and to compare the different types of fishing at Combu, Onças and Mosqueiro islands, identifying sustainability indicators, considering the economic, social, ecological and technological aspects, which results may help to assist to generate subsidies for the formulation of public policies to the fisheries sector. Descriptive and numeric variables considering the different dimensions were used in order to describe the systems of fish production to make comparisons including both the systems and also the islands studied. For comparative statistical analysis only the numerical variables (means and percentages) were used from data collected by researches and from secondary data. Multivariate analysis; Cluster analysis and ordination (MDS) comparing the systems were applied to identify groups and the possible causes of the similarity between the systems for each island. On Combu´s Island it was identified the following fishery systems: matapi, gill net for consumption, block net , longline hook medium and longline hook large. On Onças´s Island it was observed the fishery systems matapi, gill net for consumption, gill net for commercial purpose, block net , longline hook medium and longline hook large. On Mosqueiro´s Island it was identified the fishery systems matapi, gill net commercial, longline hook medium and longline hook large. The analysis of systems in all dimensions showed that the island of Mosqueiro differs to the other islands. When analyzed separately by dimension Matapi system, block net and gill net consumption of the islandes Combu and Onças were very similar. However, systems observed in Mosqueiro´s Island differ from the other islands mainly considering the economic dimension. Based on the results, it can be said that fishing in the islands of Onças and Combu is for subsistence and the main activity is the vegetable extraction while fishing in Mosqueiro´s Island is commercial. Although fishing in the islands of Combu and Onças is only for subsistence, it´s also an important source of food and extra money for the residents. In Mosqueiro´s Island fishing has high economic importance, but the fishing areas are also exploited by fishermen from other parts of the state without any management initiatives by the government.
Acesso aberto (Open Access)
A ictiofauna e a atividade pesqueira na Ilha das Onças, Barcarena - Pará
(Universidade Federal do Pará, 2010) TORRES, Danielly Gurjão; FRÉDOU, Thierry; http://lattes.cnpq.br/8119220407894290
The Onças Island is one of the many islands that are on the left bank of the Guajará Bay, known mainly by the presence of palm tree that produces açaí as fruit (Euterpe oleracea) and the importance that its channels represent for the regional navigation. Among the main channels that make up the island, stands the Piramanha Channel, which crosses the Onças Island. The composition and distribution of the icthyofauna in this island is not well known, on that basis, this study aimed to describe the species in the region and its use for the environment and the importance they have for the local population. Fisheries were conducted quarterly in accordance with the climatic periods with block net in the river creek and gill nets in the channel. At the time of the sampling, abiotic data were recorded in situ (pH, salinity, temperature), with no results differences between the periods. Were captured 1177 individuals from 20 families, most of which were Aspredinidae, Sciaenidae and Pimelodidae, distributed in 39 species identified (27 in the channel and 26 in the river creek). The species were mostly constant (FO> 75%), and diversity was similar over time, with no dominant species in any period. The W statistics show disturbed environments, in the rainiest months of March and December, however, in them were also reported the greatest abundance (CPUEn and CPUEb), indicating that this analysis may not be suitable for environments where there is dominance of small individuals, causing a natural abundance, be confused with an exchange of dominance. Multivariate analysis showed that the environments are significantly different, mainly by numerical abundance of A. aspredo in the channel, and P. squamosissimus in the river creek, which together with the L. dorsalis, the H. marginatus, the A. aff. ucayalensis form the main species on the island. In the main channel were collected mostly estuarine especies, which feed mainly on zoobenthos and fish, and in the river creek, there was dominance of freshwater species, whose food preferences change over the year, apparently according to the rainfall. Generally the species are small and mediumsized (CT <30 cm), immature (mostly in stage A) and feed in a period of one year at least. Despite the favorable environment for fishing, 90% of residents has the açaí as its main source of income, and fishing as a secondary source, depending on harvest periods of açaí. The main fishing gear is the shrimp trap, that targets the Amazon shrimp (Macrobachium amazonicum), followed by gill net and block net, that targets species are mostly caught in the same abundance in this study. For small and low economic value, fishing on the island is mainly performed as a supplementary source of protein, since the intense fishing activity and disturbance caused by vessels further diminish this number.
Acesso aberto (Open Access)
A ictiofauna no monitoramento da qualidade ambiental em um distrito industrial do estuário amazônico
(Universidade Federal do Pará, 2011) VIANA, Andréa Pontes; ROCHA, Rossineide Martins da; http://lattes.cnpq.br/4371300451793081; FRÉDOU, Flávia Lucena; http://lattes.cnpq.br/4779271407117528
The district of Vila do Conde, in the municipality of Barcarena, is a prominent industrial hub, constituting a risk factor for water quality. Given this, the present study focused on the environmental quality of the aquatic habitats adjacent to this site, using the fish community as a bioindicator and liver two species of fish as a biomarker histopathological. The collection of abiotic data (water samples) and fish specimens was organized in three distinct zones, representing different levels of impact. Zone 1 was located in the vicinity of the Vila do Conde cargo terminal, where the risk of contamination was highest. Zone 2 was in the Capim Island, located on the border between the municipalities of Bacarena and Abaetetuba, classified as a median risk area due to its relative proximity to the port. Zone 3 was in Onças Island, which was classified as minimum risk, due to its distance from the industrial district of Vila do Conde. Two different types of environment – the main river channel and marginal tidal creek were sampled in all three zones. Samples were collected every two months, covering the region’s principal climatic periods - rainy-dry transition (June 2009), dry season (September 2009), dry-rainy transition (January 2010), rainy season (April 2010), in one year collection. Data was collected using monofilament gillnets and block net. Aiming to evaluate the water quality considering different tools, this study was divided into three parts. In the the first part, the icthyofauna was used as an bioindicator of water quality (Chapter 1). In the second part, two species abundant with different feeding habits, Plagioscion squamosissimus and Lithodoras dorsalis, to assess the health of the environment through the use of liver as a biomarker histopathological (Chapter 2). Finally, all families of descriptors (chapters 1 and 2), were combined into biological integrity indexes in chapter 3. The analysis of the icthyofauna as an bioindicator showed differences in the composition between zones and environments (main channel and tidal creek), for the different groups of descriptors. Considering the 77 species captured, only 23 species were recorded in comparison with the less impacted areas. Also, large fish were least common in zone 1. In the present study, the smaller proportion of larger-sized fish recorded in the impacted areas may reflect an ecological response to anthropogenic disturbance. Biomarker analysis, carried out through the liver histopatologic study, was efficient to detect the influence of antropogenic factors in the heatlh of P. squamosissimus e L. dorsalis. The MAV (Mean Assessment Values), HAI (Histological Alteration Index) e o MDS (multidimensional scaling) analysis all indicated clear differences between the areas surveyed. The alterations were more severe (in some cases, irreversible) in zone 1, which was closest to the port and the industrial district. The principal alterations observed in the tissue of both species included an increase in the number of melanomacrophagous centers, fatty degeneration, inflammation, congestion, hepatitis, and focal necrosis. The hepatic alterations observed in the present study were generally more intense in the carnivorous P. squamosissimus, which feeds mainly on shrimp in the region of the study area. Though integrity indexes, all community information were combined into metrics. In the present study, considering the ABC curve, in the main channel and creek, the zones 1 and 2 were classified as moderately disturbed, which predicts an increase in the relative abundance of opportunistic species. The BHI (Estuarine biological health index), EFCI (Estuarine fish community índex), TFCI (Transitional fish classification índex) e EBI (Estuarine biotic integrity index) were considered to be excellent indicators of the ecological integrity of the different sectors of the study area, and were especially effective for the demonstration of the critical alterations of the fish community of zone 1. It was also possible to identify alterations to the environment of zone 2. The procedures adopted in the present study were nevertheless adequate for the detection of the alterations to the environment which have occurred in the vicinity of the town’s industrial district and cargo terminal and are able to be replicted in others estuarine areas. However, more reliable information on the bio-accumulation of heavy metals in these species will be necessary. This is especially important due to the prominence of both species in the diet of the local communities.
Acesso aberto (Open Access)
Uso doméstico da água em comunidades ribeirinhas: diagnóstico das comunidades dos furos Conceição e Samaúma, na ilha das Onças, estado do Pará
(Universidade Federal do Pará, 2015-10-26) RODRIGUES, Fabrício César da Costa; MORAES, Sérgio Cardoso de; http://lattes.cnpq.br/4568311568729454; TEIXEIRA, Luiza Carla Girard Mendes; http://lattes.cnpq.br/9773700229115395
This research discusses the domestic use of water with the purpose of understanding what alternatives are use and utilized according to the life style of the riverside. Two riverside communities were analyzed: Conceição Hole Community and the Samauma Hole Community, both located on the Island of Onças, state of Para and whose way of life are marked by specific social economic and cultural identity. The guiding of this question in this research is; How to use the domestic waters in Riverside communities and what is the relationship of such use to the way of life of these populations? The methodology adopted in the study was a qualitative approach, from a historical - descriptive analysis sought to reconstruct the history of identities of those communities in addition to observe and understand the subjective aspects of the domestic water used in these locations. The theoretical framework of these research was based on riverside populations, and multiple use of water; beside, the great project impacts in the Amazon. It is concluded that there are changes of habits and culture man-water relations in the riverside areas of Para, because the analyzed communities have, for example, to buy water for domestic use in function of supply problems and environmental impacts that are present in hydrographic of Barcarena basins and riverbeds circulated river basins.