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181.
182.
Paula Veloz 《Journal of Land Use Science》2020,15(2-3):389-405
ABSTRACT This triple case study attempts, from the viewpoint of economic and environmental anthropology, to take into account and to assess pertinent cultural, political, institutional, and economic factors that have an impact on how the açaí value chain develops or restrains according to the given regulatory frameworks. Based on the common-pool resources approach (CPR), the study examines how institutional actors negotiate in a local/global (glocal) dynamic and how from these different scales, they contest and intertwine while pursuing use, access, and management strategies for the açaí production. The article aims to contribute with anthropological insights to the LULC research by underlining the agency of the subjects of land use and tenure policies in Amazonia; to enhance the prominence of local actors and to promote the cultural and economic value of their traditional practices and institutions. 相似文献
183.
Marcionília Fernandes Pimentel Évila Pinheiro Damasceno Paula Christine Jimenez Pedro Filipe Ribeiro Araújo Marcielly Freitas Bezerra Pollyana Cristina Vasconcelos de Morais Rivelino Martins Cavalcante Susana Loureiro Letícia Veras Costa Lotufo 《Environmental monitoring and assessment》2016,188(5):298
184.
Aurora Neagoe Paula Stancu Andrei Nicoară Marilena Onete Florian Bodescu Roxana Gheorghe Virgil Iordache 《Environmental science and pollution research international》2014,21(11):6859-6876
Applied research programs in the remediation of contaminated areas can be used also for gaining insights in the physiological and ecological mechanisms supporting the resistance of plant communities in stress conditions due to toxic elements. The research hypothesis of this study was that in the heavily contaminated but nutrient-poor substrate of mine tailing dams, the beneficial effect of inoculation with arbuscular mychorrizal fungi (AMF) is due to an improvement of phosphorus nutrition rather than to a reduction of toxic element transfer to plants. A concept model assuming a causal chain from root colonization to element uptake, oxidative stress variables, and overall plant development was used. The methodological novelty lies in coupling in a single research program experiments conducted at three scales: pot, lysimeter, and field plot, with different ages of plants at the sampling moment (six subsets of samples in all). The inoculation with AMF in expanded clay carrier had a beneficial effect on the development of plants in the amended tailing substrate heavily contaminated with toxic elements. The effect of inoculation was stronger when the quantity of expanded carrier was smaller (1 % vs. 7 % inoculum), probably because of changes in substrate features. The improvement of plant growth was due mainly to an improvement in phosphorus nutrition leading to an increase of protein concentration and decrease of oxidative stress enzyme activity (superoxide dismutase and peroxidase). In a single data subset, an effect of inoculation on the uptake of several toxic elements could be proved (decrease of As concentration in plant roots correlated with a decrease of oxidative stress independent from the effect of P concentration increase). The multi-scale approach allowed us to find differences between the patterns characterising the data subsets. These subset-specific patterns point out the existence of physiological differences between plants in different development states (as a result of sampling at different plant ages). From an applied perspective, conclusions are drawn with respect to the use of plants in the monitoring programs of contaminated areas and the use of inoculation with AMF in the remediation of tailing dams. 相似文献
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188.
Ana Paula Madeira Di Beneditto Cristina Maria Magalhães de Souza Helena Amaral Kehrig Carlos Eduardo Rezende 《Marine Biology》2011,158(10):2209-2217
The feeding preferences of the coastal dolphins Pontoporia blainvillei and Sotalia guianensis in south-eastern Brazil (21o18′S–22o25′S) were assessed through the prey’s index of relative importance (IRI), total mercury
concentration (Hgtot), and stable isotopic (δ15N and δ13C) to compare their efficiency in the discrimination of prey contribution to the predators’ diet. The IRI was the best tool
to describe the dolphins’ preference, while Hgtot and δ15N seemed to be efficient as a trophic marker when the diet is made up of prey of varying sizes, as observed in S. guianensis. Both dolphins presented lighter δ15N than their prey species, which is an unusual pattern. However, as the sample size to isotope ratios analysis was small,
especially to the dolphins, the results should be considered with caution, and further studies are necessary to corroborate
these findings. The δ13C values characterized a typical coastal food chain, confirming the preferential area of these species. 相似文献
189.
Maternal nutritional status is a determinant of child health. This paper studies the association between a mother's body mass index (BMI) and her infant's nutritional status over a one year time frame after the 1998 flood crisis in Bangladesh. The paper uses secondary analysis of data collected from 757 households in seven rural areas of Bangladesh affected by the 1998 flood using multiple-stage probability sampling techniques (n = 143). Logistic regression models were employed to investigate the predictive impact of maternal BMI on infant's nutritional status after controlling for a range of child and maternal factors. An underweight mother was a significant factor with regard to the risk of infants suffering stunting (odds ratio (OR) = 4.45, 95 per cent confidence interval (CI) = 1.04-18.94) and being underweight (OR = 3.51, 95 per cent CI = 1.02-12.05) a year later, but not wasting (OR = 2.09, 95 per cent CI = 0.51-8.67). The findings suggest that there is a post-emergency link between maternal and infant nutritional health. 相似文献
190.
Capacity of simultaneous removal of zinc and cadmium from contaminated media, by two microalgae isolated from a polluted site 总被引:1,自引:0,他引:1
Cristina M. Monteiro Paula M. L. Castro F. Xavier Malcata 《Environmental Chemistry Letters》2011,9(4):511-517
Several aquatic environments have been contaminated with heavy metals dumped via industrial effluents. Numerous studies have
been published regarding the removal of single metals from aqueous solutions by microalgal biomass. However, such studies
do not reflect the actual problem associated with industrial effluents because usually more than one metal species is present.
Here we studied the biosorption capacity of Zn2+ and Cd2+ as single- and binary-metal systems by two microalgae, Scenedesmus obliquus and Desmodesmus pleiomorphus, isolated from a polluted site in Northern Portugal. For each metal independently, D. pleiomorphus showed a higher metal sorption capacity than S. obliquus, at concentrations ranging from 60 to 300 mg/l (except 150 mgCd/l). Maximum amounts of Zn2+ and Cd2+ removed were 22.3 and 60.8 mg/g by S. obliquus, and 83.1 and 58.6 mg/g by D. pleiomorphus. In binary-metal solutions, S. obliquus was in general able to remove Zn2+ to higher extents than Cd2+, whereas the opposite was observed with D. pleiomorphus. The simultaneous uptake of Zn2+ and Cd2+ by both microalgae was considerably lower than that of their single-metal counterparts, at equivalent concentrations. Although
microalgal uptake from binary-metal solutions was lower than from single-metal ones, the wild microalgae selected were able
to efficiently take up mixtures of Zn2+ and Cd2+ up to 300 mg/l of both metals—thus materializing a promising bioremediation vector for polluted waters. 相似文献