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251.
Eduardo V. V. Varej?o Carlos R. Bellato Maur��cio P. F. Fontes Jaime W. V. Mello 《Environmental monitoring and assessment》2011,172(1-4):631-642
The Iron Quadrangle has been one of the most important gold production regions in Brazil since the end of the seventeenth century. There, arsenic occurs in close association with sulfide-rich auriferous rocks. The most abundant sulfide minerals are pyrite and arsenopyrite, yet trace metal sulfides occur in subordinate phases as well. Historical mining activities have been responsible for the release of As and trace metals to both aquatic and terrestrial environments close to mining sites in the region. Therefore, this study was aimed to evaluate the distribution and mobility of As, Cd, Co, Cr, Cu, Ni, Pb, and Zn in streams in the southeast portion of the Iron Quadrangle between the municipalities of Ouro Preto and Mariana, the oldest Brazilian Au mining province. Total concentrations of some trace metals and arsenic in water were determined. The four-stage sequential extraction procedure proposed by the commission of the European Communities Bureau of Reference (BCR) was used to investigate the distribution of these elements in stream sediments. Arsenic concentration in water was >10 ??g L???1 (maximum limit permitted by Brazilian environmental regulations for water destined for human consumption) at all sampling sites, varying between 36.7 and 68.3 ??g L???1. Sequential extraction in sediments showed high concentrations of As and trace metals associated with easily mobilized fractions. 相似文献
252.
Martins Thiago Rodrigues Bertuol Daniel Assumpo Tanabe Eduardo Hiromitsu 《Journal of Material Cycles and Waste Management》2022,24(2):633-641
Journal of Material Cycles and Waste Management - Technological development has led to a growing generation of waste electrical and electronic equipment, including cables. This work concerns the... 相似文献
253.
Zamora-Briseño Jesús Alejandro Améndola-Pimenta Monica Ortega-Rosas Daniel Antonio Pereira-Santana Alejandro Hernández-Velázquez Ioreni Margarita González-Penagos Carlos Eduardo Pérez-Vega Juan Antonio del Río-García Marcela Árcega-Cabrera Flor Rodríguez-Canul Rossanna 《Environmental science and pollution research international》2021,28(26):34309-34327
Environmental Science and Pollution Research - Crude oil is one of the most widespread pollutants released into the marine environment, and native species have provided useful information about the... 相似文献
254.
Schneider Silvana Demarqui Fábio de Freitas Costa Eduardo 《Environmental and Ecological Statistics》2022,29(4):869-911
Environmental and Ecological Statistics - Populations of free-ranging dogs are still a matter of concern in developing countries. The presence of stray dogs is associated with environmental and... 相似文献
255.
Curbani Franciane Entringer Lacerda Kaio Calmon Curbani Flávio Barreto Fernando Túlio Camilo Tadokoro Carlos Eduardo Chacaltana Julio Tomás Aquije 《Environmental Modeling and Assessment》2022,27(2):233-249
Environmental Modeling & Assessment - Subtropical estuaries such as the Vitória Island Estuarine System (VIES), located on the central coast of Brazil, are under strong anthropic pressure.... 相似文献
256.
Allocation trade-offs of carotenoids between their use in the immune system and production of sexual ornaments have been suggested
as a proximate mechanism maintaining honesty of sexual signals. To test this idea, we experimentally examined whether carotenoid
availability in the diet was related to variation in antibody response to novel antigens in male greenfinches (Carduelis chloris aurantiiventris), a species with extensive carotenoid-dependent plumage colouration. We also measured the cost of mounting a humoral response
in terms of circulating carotenoids. Finally, we examined the relationship between plumage colour, immune response and circulating
carotenoids. We found that males with carotenoid-supplemented diets showed stronger antibody response than non-supplemented
birds. We also found that activation of the immune system significantly reduced circulating carotenoids (24.9% lower in immune-challenged
birds than in control birds). Finally, intensity (chroma) of ventral plumage colouration of males, a character directly related
to concentration of total carotenoids in feathers, was negatively correlated with the immune response and circulating carotenoids
in winter. These results support the idea that carotenoids are a limiting resource and that males trade ornamental colouration
against immune response. 相似文献
257.
Total concentrations of Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Pb and Zn have been estimated in soil (A-horizon) and in leaves and stem samples of two Mediterranean species (Nerium oleander L. and Pinus pinea L.) growing in an industrial area in Spain (Huelva). Both species showed a different behaviour for the elements studied. Bark and leaves of both species acted as excluders of Al, Ba, Cr, Fe and Pb, N. oleander acted as indicator of Cu and Zn and, needles and bark of P. pinea behaved as accumulators of Cu. The enrichment ratio data indicated that Cu in soil and plant was enhanced with anthropogenic activities, with industrial activities being the primary contributor for Cu. All the other elements studied were controlled by natural source variations, but Pb could also be anthropogenically enhanced. Wood did not accumulate pollutants, with the translocation from bark being rather reduced. Uptake patterns of metals into foliage and bark tissues were more or less the same in both species for almost all the studied elements, which indicates that both plant parts could be indifferently used as biomonitors. 相似文献
258.
This research addresses the need to improve our knowledge on the demand for national forests for recreation and offers an in-depth data analysis supported by the complementary use of count data and ordered models. From a policy-making perspective, while count data models enable the estimation of monetary welfare measures, ordered models allow for the wider use of the database and provide a more flexible analysis of data. The main purpose of this article is to analyse the individual forest recreation demand and to derive a measure of its current use value. To allow a more complete analysis of the forest recreation demand structure the econometric approach supplements the use of count data models with ordered category models using data obtained by means of an on-site survey in the Bussaco National Forest (Portugal). Overall, both models reveal that travel cost and substitute prices are important explanatory variables, visits are a normal good and demographic variables seem to have no influence on demand. In particular, estimated price and income elasticities of demand are quite low. Accordingly, it is possible to argue that travel cost (price) in isolation may be expected to have a low impact on visitation levels. 相似文献
259.
260.