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

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Acesso aberto (Open Access)
Avaliação da exposição congênita ao mercúrio sobre o peso de recém-nascidos em Porto Velho-Rondônia
(Universidade Federal do Pará, 2003) RAMOS, Teresa Cristina; AMORIM, Marúcia Irena Medeiros de; http://lattes.cnpq.br/6969908284845675
A hundred mothers with their newborn babies, were studied, in three hospitals in the city of Porto Velho, for the evaluation of the prenatal exposure to mercury, through the study of the mercury level in the birth, the mother and newborn’s hair, mother’s blood, umbilical cord and placentas samples. The mothers answered a questionnaire, with the objective of identifying risk factors of mercury contamination and all children were subjected to the routine physical examination. The mercury analysis was carried in the Environmental Biogeochemical Laboratory of UNIR, through the spectrophotometry of atomic absorption technique, the results showed significant correlation among the total mercury concentration in the placenta and the umbilical cord, newborn hair, the mother’s blood and hair. We concluded that there was a congenit exposure, that the levels of concentration of this metal observed, in the study, didn’t affect directly on pregnantable age; but, showed significant connection between the mercury and concentration and the newborn weight , confirmed by the results found in the newborn’s hair.
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)
Padrão de distribuição de assembléias de aves nas florestas de várzea do rio Madeira
(Universidade Federal do Pará, 2014) SILVA, Bianca Darski; SANTOS, Marcos Pérsio Dantas; http://lattes.cnpq.br/7941154223198901