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. The litterfall patterns recorded in the present study were consistent with those recorded at other Amazonian sites, and in some other tropical ecosystems. Total litterfall correlated with rainfall and river levels, but whereas the leaf and fruit fractions followed this general pattern, the flower fraction presented an inverse pattern, peaking in the dry season. ![]() The sites included two marginal flooded forests of insular lakes (Ilha Grande and Pimentel) and two flooded forests on the banks of the Xingu itself (Boa Esperança and Arroz Cru). According to this view, litterfall production (total and fractions) was estimated in four alluvial rainforest sites on the middle Xingu River over an annual cycle, and examined the effect of seasonal flooding cycle. The assumption for this study was that litterfall in floodplain environments of the middle Xingu river follows a pattern of seasonal variation. All rights reserved.Įffect of seasonal flooding cycle on litterfall production in alluvial rainforest on the middle Xingu River (Amazon basin, Brazil). Additionally, results highlight the need to establish local criteria to define contamination limits for different metals while taking into account local geochemistry particularities and biome diversity. This indicates low risk for human consumption. However, the fish analyzed did not exhibit relevant levels of contamination. This was the first study about trace elements in the Middle Xingu River, which leads us to conclude that rainfall and cassiterite mining activities strongly influence the mobilization of metals, especially in abiotic compartments. Concentrations in water, sediment, and soil showed that some points of the Xingu River, Fresco River and mining pits are contaminated by trace elements, mainly As, Hg, Cr, Pb, and Ni. Metal values in the muscle of both fish species were relatively low at all sampling points and in both monitored seasons. Samples of sediment (Ni>18mg/kg and Cr>37.30mg/kg) and soil (Pb>72mg/kg, Cr>75mg/kg and Ni>30mg/Kg) showed concentrations above the recommended by local legislation. The sites with mining activity were the regions that were the most contaminated by metals. PERMANOVA showed that the metals behaved differently in the water throughout the monitored season and between sampling points. ![]() Ordination analysis (PCA) highlighted As and Cu elements in the water. 368 indigenous people were examined in 2007 and 423 in 2013 there was no significant difference between the means of the number of decayed, missing and filled teeth at 5 years (6.43, 5.85 p=0.29), and at 12 years (2.54, 2.78 p=0.81) this difference was significant at 15-19 years (6.89, 4.65 p0.14μg/L) was higher than the local reference values at all sampling points and in both seasons. cross-sectional study panel, with secondary data provided by the Indigenous Special Sanitary District of Xingu and Project Xingu. To describe the prevalence of dental caries and the supply of dental care in the population of Xingu Indigenous Park, Brazil, at 5, 12 and 15-19 years old, in 20. Lemos, Pablo Natanael Rodrigues, Douglas Antonio Frazão, Paulo Coelho, Clayton Carvalho Campos, Juliana Nogueira de Souza Narvai, Paulo Capel Numerous fires occurred near the headwaters of the Xingu River and the Xingu Indigenous Peoples Reserve in Mato Grosso, Brazil, during late June and early July, 2004, as seen by NASA Terra spacecraft.ĭental caries in peoples of Xingu Indigenous Park, Brazil, 20. Fire and Deforestation near the Xingu River
0 Comments
Leave a Reply. |