Navegando por Assunto "Rio Purus (Bacia do Amazonas)"

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Acesso aberto (Open Access)
Caracterização do pescador e da frota pesqueira comercial de Manoel Urbano e Sena Madureira (AC) e Boca do Acre (AM)
(2012-06) ALMEIDA, Oriana Trindade de; AMARAL, Lucilene Oliveira da Silva; RIVERO, Sérgio Luiz de Medeiros; SILVA, Christian Nunes da
Several studies about the ﬁ shing sector have been carried on in the Amazon, however, the majority of these studies are concentrated on regions near the Amazon river bank and its delta. This work has the objective to characterize the Purus commercial ﬁshing ﬂeet and the ﬁsher in three counties: Manoel Urbano and Sena Madureira in the Brazilian state of Acre (AC) and Boca do Acre, in Amazonas (AM).We estimate the ﬁsheries production and income. The results show that in Manoel Urbano (AC) lake ﬁsheries predominate while in Sena Madureira (AC), the diversity in ﬁshing places are lager with ﬁshers using lakes, river and creeks. In Boca do Acre (AM), the largest among the three cities, the most important ﬁshing plots are Pauini and Labrea areas. In relation to boats, Manoel Urbano ﬁshers use only canoes with most of it motorized. In Boca do Acre, ﬁ sheries are practiced mainly in boat. In relation to ﬁshing trip costs the results showed that variable costs are the main costs for canoes (63% of total income) and boats (73% of total income). The analyses showed also that motorized canoes have larger productive capacity per unit of effort (CPUE) in relation to boats.
Acesso aberto (Open Access)
Efeito de bacias e de variáveis ambientais na estrutura de comunidades de peixes de igarapés na região do interflúvio Madeira-Purus
(Universidade Federal do Pará, 2008) BARROS, Daniela de França; ZUANON, Jansen Alfredo Sampaio; http://lattes.cnpq.br/0161925591909696; ALBERNAZ, Ana Luisa Kerti Mangabeira; http://lattes.cnpq.br/1220240487835422
The main objective of this study was to investigate the richness and composition of the fish fauna in headwaters of streams in the Madeira-Purus interfluvial region, and if they are related to environmental variables and / or watersheds. Data was collected along two field campaigns, lasting approximately 20 days each, between the months of April and July 2007. A total of 22 streams were sampled, belonging to five different watersheds. Fish were captured with hand nets and small seine nets. Information on the structural characteristics of the streams and physical-chemical of water was also obtained. A total of 5509 fish were captured, belonging to 86 species, 22 families and six orders. Characiformes was the most diversified taxonomic group, followed by Gymnotiformes and Siluriformes. The species composition was influenced mostly by the width and depth of the channel, discharge and substrate. The presence of different environments around creeks has also contributed to the differences in fish species composition. The watersheds had strong effect on communities of fish. However, the results cannot allow to assert with certainty if differences in fish composition among watersheds are reflecting historical effects or environmental conditions.
Acesso aberto (Open Access)
Nutrientes (K, P, Ca, Na, Mg e Fe) em sedimentos (solos aluviais) e cultivares (feijão e milho) de praias e barrancos de rios de água branca: a bacia do purus no estado do Acre, Brasil
(2009) MARTINS, Milta Mariane da Mata; COSTA, Marcondes Lima da
The present research highlights the macronutrient abundance in the sediments of beaches and cliffs and cultivates in the river Purus and flowing, southwest of Amazon. The concentrations found in leaves and bean seeds and corn leaves reflect the mineralogical and chemical nature of those rich sediments in K2O and Na2O, which are formed by smectite, illite and K-feldspar. The factors of transfer of the elements in the corn leaves and bean (Ca>K>Na) and bean seeds (Na>K>Ca) demonstrate that the nutrient needs of the cultivate were found appropriately in the sediments (soils) of the beaches and cliffs.