Navegando por Assunto "Ilha de Colares - PA"

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Acesso aberto (Open Access)
O Caranguejo-Uçá, Ucides cordatus, (Linnaeus 1763): da captura à comercialização nas comunidades quilombolas cacau e terra amarela, Ilha de Colares, Pará-Brasil
(Universidade Federal do Pará, 2014-07-10) CARVALHO, Rogério Lopes; QUEIROZ, Helder Lima de; http://lattes.cnpq.br/3131281054700225
This study was conducted at the quilombola communities of Cacau and Terra Amarela, municipality of Colares, Pará State, Brazil. The objective was to describe and analyze the exploitation of the land crab, or mangrove crab (Ucides cordadus), in terms of some socioeconomic aspects, their techniques, strategies and areas of production adopted, and their forms of crab trade. And to compare these aspects with those from other traditional populations also dedicated to the same extractive activity. Semi-open questionnaires, direct observation in the field and trade and flowchart, were techniques applied in this research during 2013. In the communities studied, the extractive economy is predominant, and mangrove crab extraction is among the main activities. At Cacau and Terra Amarela, households have in average 4.3 and 4.9 members, respectively. Most of the families live in their own brickwork houses, built with conventional materials. Despite of this, these extractive households are poor and live in difficult conditions, with almost no access to public services. In general, the inhabitants stop attending school early in their lives, and most of them (72 to 82%) failed to complete the elementary school cycle. A low monthly household income was recorded; the majority of the households earn less than one minimum salary per month. The laço and the braceamento are the main techniques for obtaining the resource. The technique of braceamento is performed during the four days of work per week in average during the rainy months. The application of laço is performed in average during twelve days per month during the drought months. Cacau produces in average 52 (SD ± 15) crabs / work day / person and 110 (SD ± 56) crabs / work day / person in in the rainy and drought periods, respectively. In the Terra Amarela community these averages are 56 (SD ± 24) crabs / day / person and 150 (SD ± 72) crabs / day/ person. The inhabitants of these communities trade with intermediaries from the region. The crabs are sold in natura, whole and alive, transported in cofos in Cacau and bags in Terra Amarela. Are traded at prices that fluctuate throughout the year, from R$ 40.00 to R$ 80.00 each group of 100 individuals. The low pay for they work, together with low education level, deficiencies in infrastructure, low technology for production, and lack of local provision of public services are some of the aspects contributing to the low quality of life of these families in the communities. These factors also contribute for the maintenance of the engagement of local inhabitants in low value activities, such as the extraction of mangrove crabs. The conditions described for Cacau and Terra Amarela are quite similar to those observed in other traditional communities living and working in similar conditions in the coastal region of Pará State, Brazil. The extraction and trade are very similar to most of the traditional communities that exploit this resource in mangroves forests along the coast of Pará. No significant differences or peculiarities were observed in the extractive activity of these quilombola communities, in relation to other traditional populations performing this same activity in the area. However, differences were found between the two communities studied, which represent variations of this general pattern identified. Probably these differences are related to the technologies adopted, and also on the amount of crabs captured in the two locations. These impact the costs of the activity, its profitability, and the quality of life of inhabitants of Cacau and Terra Amarela.
Acesso aberto (Open Access)
Influência da sazonalidade sobre as águas estuarinas dos furos da ilha de Colares (baía do Marajó)
(Universidade Federal do Pará, 2014-12-17) GUIMARÃES, Robledo Hideki Ebata; EL-ROBRINI, Maâmar; http://lattes.cnpq.br/5707365981163429
The characterization of surface and interstitial waters in estuaries is critical to unravel the environmental conditions, environmental quality and seasonal changes, which may occur in smaller space such as the hole in the island of Colares. This work aims to show the influence of seasonality in estuarine waters in the north and south of the mouth of the hole island of Colares and the contribution of pore waters to surface waters. The physical and chemical parameters and nutrients are included: rainfall (IP), temperature, salinity, pH, electrical conductivity, total dissolved solids, suspended particulate matter, dissolved oxygen, Secchi depth, nitrate, nitrite, N-ammonia, phosphate, silicate and sulfate. The determination of these parameters occurred simultaneously in each mouth of the hole necklaces over a tidal cycle (13 hours) in rainy (04/10/2013) and drier (10/05/2013) periods. The results show that seasonality affects abiotic conditions of estuarine waters bore the island of Colares and deduces that P1 is the most important factor to effect the changes of physical and chemical parameters, and especially the higher charge mobility, availability and distribution of dissolved nutrients, which were found in higher concentrations in the rainy season. Although the nutrients nitrate and N-ammonia were considered very high at the mouth North, possibly related to the influence of anthropogenic activities. However were considered within the limits established by CONAMA Resolution 357/05. Mouth occurred in South pH levels outside the standard stipulated by Resolution CONAMA, but the phenomenon was considered natural since in this specific is distant from anthropogenic activities. In less rainy period the N-ammonia was found to be absent in mouth North and South. The mangrove was considered as a source of salinity, silicate and sulfate to surface waters.
Acesso aberto (Open Access)
Ocorrência, biologia e uso das raias de água doce na Baía de Marajó (Pará, Brasil), com ênfase na biologia de Plesiotrygon iwamae (Chondrichthyes : Potamotrygonidae)
(Universidade Federal do Pará, 2001-06-29) CHARVET-ALMEIDA, Patricia; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
The present study included stingrays of the Potamotrygonidae family, the only one among elasmobranches that possesses ali representatives exclusively in freshwater. It was carried out in the Islands of Cotijuba and Colares, which are located in the estuarine region of the Marajó Bay, during the rnonths of May, August, October and December of 2000. The sampling included the genera Plesiotrygon, Potamottygon, Paratrygon and a fourth genus that is currently being described. Information related to the frequency of occurrence and biomass indicated the predominance of Potamottygon spp. and Plesiotrygon iwamae in this region. The fishery equipment used selected the size of the stingrays captured. Specific observations were made concerning the feeding and reproductive biology of the species P. iwamae. Stomach content analysis, using the index of relative importance (TRT), indicated that this species feeds mainly on crustaceans and fish. Macroscopic observations of the reproductive organs of males and females were made. The results indicated that this species presents aplacental matrotrophic viviparity with trophonemata. Probably its reproductive cycle is seasonal, is related to salinity changes and several females are captured as they approach the beaches of this bay to reproduce. In this region the freshwater stingrays are routinely captured mainly for food, medicinal and ornamental purposes_ A high number of stingray accidents and treatments were observed in both islands. The conservation of the species of freshwater stingrays requires more knowledge about their biology, follow-ups on their exploration and perhaps management measures.
Acesso aberto (Open Access)
Pesca, policromatismo e aspectos sistemáticos de Potamotrygon scobina Garmam, 1913 (Chondrichthyes : Potamotrygonidae) da região da Ilha de Colares - Baía de Marajó - Pará
(Universidade Federal do Pará, 2003-03-07) ALMEIDA, Mauricio Pinto de; BARTHEM, Ronaldo Borges; http://lattes.cnpq.br/4192105831997326
The present study included specimens of the Family Potamotrygonidae, the only one among elasmobranchs formed entirely by freshwater representatives. This research was developed in the estuarine region of the Marajó Bay, in the island of Colares, during the months of May, August, October and December of 2000, December of 2001 and March of 2002. Sampling included the genera Plesiotrygon, Potamottygon, Paratrygon and a fourth undescribed genus, totalizing 723 captured specimens. Frequency of occurrence and biomass results indicated a predominance of the genus Potamotrygon especially of the species P. scobina in this area. Fishing gear utilized influenced the size of the stingrays captured. Specific observations related to the dorsal color patterns, size and sexual distribution of the species P. scobina were made. Results of multivariate statistical analysis and molecular genetics indicated that dorsal color patterns as currently employed in distinguishling morphotypes in fact did not indicate separate species and a single group was formed. Three previously undescribed dorsal color patterns for sub-adults / adults and two new patterns for juvenile specimens were identified for P. scobina. External characters analyzed for this species presented a wide variation in form, number, size and structure disposition that were more evident in sub-adults / adults. In this region, freshwater stingrays are routinely captured mainly for food and for medical and ornamental purposes. The conservation of freshwater stingrays species requires further knowledge about their biology and taxonomy in order to follow-up its exploitation and perhaps indicate management procedures.