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671.
George G. Ice George W. Brown John A. Gravelle C. Rhett Jackson Jeffrey T. Light Timothy E. Link Douglas J. Martin Dale J. McGreer Arne E. Skaugset 《Journal of the American Water Resources Association》2010,46(4):838-842
Ice, George G., George W. Brown, John A. Gravelle, C. Rhett Jackson, Jeffrey T. Light, Timothy E. Link, Douglas J. Martin, Dale J. McGreer, and Arne E. Skaugset, 2010. Discussion –“Stream Temperature Relationships to Forest Harvest in Western Washington” by Michael M. Pollock, Timothy J. Beechie, Martin Liermann, and Richard E. Bigley. Journal of the American Water Resources Association (JAWRA) 46(4): 838-842. DOI: 10.1111/j.1752-1688.2010.00441.x 相似文献
672.
Perceptions of climate change,multiple stressors and livelihoods on marginal African coasts 总被引:1,自引:0,他引:1
Matthew Bunce Sergio Rosendo Katrina Brown 《Environment, Development and Sustainability》2010,12(3):407-440
Studies of multiple stressors in Africa often focus on vulnerable inland communities. Rising concentrations of the world’s
poor live in coastal rural–urban areas with direct dependencies on marine as well as terrestrial ecosystem goods and services.
Using participatory methods we elicited perceptions of stressors and their sources, impacts and consequences held by coastal
communities in eastern Africa (Mtwara in Tanzania and Maputo in Mozambique). Respondent-informed timelines suggest wars, economic
policies and natural increase have led to natural resource-dependent populations in marginal, previously little-inhabited
lowland coastal areas. Respondents (n = 91) in interviews and focus groups rank climate stressors (temperature rise/erratic rain) highest amongst human/natural
stressors having negative impacts on livelihoods and wellbeing (e.g., cross-scale cost of living increases including food
and fuel prices). Sources of stress and impacts were mixed in time and space, complicating objective identification of causal
chains. Some appeared to be specific to coastal areas. Respondents reported farms failing and rising dependence on stressed
marine resources, food and fuel prices and related dependence on traders and credit shrunk by negative global market trends.
Development in the guise of tourism and conservation projects limited access to land–sea livelihoods and resources in rural–urban
areas (coastal squeeze). Mental modelling clarified resource user perceptions of complex linkages from local to international
levels. We underline risks of the poor in marginal coastal areas facing double or multiple exposures to multiple stressors,
with climate variability suggesting the risks of climate change. 相似文献
673.
Brown GS Betty RG Brockmann JE Lucero DA Souza CA Walsh KS Boucher RM Tezak MS Wilson MC 《Journal of environmental monitoring : JEM》2007,9(7):666-671
Vacuum filter socks were evaluated for recovery efficiency of powdered Bacillus atrophaeus spores from two non-porous surfaces, stainless steel and painted wallboard and two porous surfaces, carpet and bare concrete. Two surface coupons were positioned side-by-side and seeded with aerosolized Bacillus atrophaeus spores. One of the surfaces, a stainless steel reference coupon, was sized to fit into a sample vial for direct spore removal, while the other surface, a sample surface coupon, was sized for a vacuum collection application. Deposited spore material was directly removed from the reference coupon surface and cultured for enumeration of colony forming units (CFU), while deposited spore material was collected from the sample coupon using the vacuum filter sock method, extracted by sonication and cultured for enumeration. Recovery efficiency, which is a measure of overall transfer effectiveness from the surface to culture, was calculated as the number of CFU enumerated from the filter sock sample per unit area relative to the number of CFU enumerated from the co-located reference coupon per unit area. The observed mean filter sock recovery efficiency from stainless steel was 0.29 (SD = 0.14, n = 36), from painted wallboard was 0.25 (SD = 0.15, n = 36), from carpet was 0.28 (SD = 0.13, n = 40) and from bare concrete was 0.19 (SD = 0.14, n = 44). Vacuum filter sock recovery quantitative limits of detection were estimated at 105 CFU m(-2) from stainless steel and carpet, 120 CFU m(-2) from painted wallboard and 160 CFU m(-2) from bare concrete. The method recovery efficiency and limits of detection established in this work provide useful guidance for the planning of incident response environmental sampling for biological agents such as Bacillus anthracis. 相似文献
674.
Adsorption of six pesticides (2,4-D, dicamba, fluroxypyr, fluazifop-P, metsulfuron-methyl and flupyrsulfuron-methyl) in nine contrasting soils was measured using two techniques: (i) a classical batch method and (ii) a centrifugation method that allowed the measurement of adsorption at a realistic soil to solution ratio after one and seven days. Although the batch method gived significantly higher values of Kd than the centrifugation method for the more strongly sorbed molecules in the more sorptive soils, it tended to give lower adsorption coefficients compared to the centrifugation method when adsorption was lower. Discrepancies between the two methods were probably mainly due to the vigorous shaking applied in the batch technique that artificially enhances the availability of adsorption sites. This implies that shortly after application, more pesticide may be present in the soil solution and thus be available for degradation, plant uptake or leaching than will be predicted from adsorption coefficient determined using the batch method. Adsorption significantly increased between one and seven days and the extractability of total residues decreased with time. The increase in adsorption was not directly related to the level of adsorption although it was more important in soils containing more organic carbon (p=0.022). These results confirm the importance of time-dependent processes and the necessity to include them in risk assessment procedures. The centrifugation technique is a useful method to measure adsorption of pesticides at realistic soil moisture contents and seems to be an adequate technique to characterise the fraction of pesticide that is available for leaching at a given time after application. 相似文献
675.
676.
Melnyk LJ McCombs M Brown GG Raymer J Nishioka M Buehler S Freeman N Michael LC 《Journal of environmental monitoring : JEM》2012,14(1):85-93
An observational field study was conducted to assess the feasibility of a community duplicate diet collection method; a dietary monitoring tool that is population-based. The purpose was to establish an alternative procedure to duplicate diet sampling that would be more efficient for a large, defined population, e.g., in the National Children's Study (NCS). Questionnaire data and food samples were collected in a residence so as not to lose the important component of storage, preparation, and handling in a contaminated microenvironment. The participants included nine Hispanic women of child bearing age living in Apopka, FL, USA. Foods highly consumed by Hispanic women were identified based on national food frequency questionnaires and prioritized by permethrin residue concentrations as measured for the Pesticide Data Program. Participants filled out questionnaires to determine if highly consumed foods were commonly eaten by them and to assess the collection protocol for the food samples. Measureable levels of permethrin were found in 54% of the samples. Questionnaire responses indicated that the collection of the community duplicate diet was feasible for a defined population. 相似文献
677.
A comparison of various averaging techniques to calculate the Average Exposure Indicator (AEI) specified in European Directive 2008/50/EC for particulate matter in ambient air has been performed. This was done for data from seventeen sites around the UK for which PM(10) mass concentration data is available for the years 1998-2000 and 2008-2010 inclusive. The results have shown that use of the geometric mean produces significantly lower AEI values within the required three year averaging periods and slightly lower changes in the AEI value between the three year averaging periods than the use of the arithmetic mean. The use of weighted means in the calculation, using the data capture at each site as the weighting parameter, has also been tested and this is proposed as a useful way of taking account of the confidence of each data set. 相似文献
678.
Kathleen W. Brown Taeko Minegishi Cynthia Campisano Cummiskey Matt A. Fragala Ross Hartman David L. MacIntosh 《Environmental science and pollution research international》2016,23(3):1986-1997
Growing awareness of polychlorinated biphenyls (PCBs) in legacy caulk and other construction materials of schools has created a need for information on best practices to control human exposures and comply with applicable regulations. A concise review of approaches and techniques for management of building-related PCBs is the focus of this paper. Engineering and administrative controls that block pathways of PCB transport, dilute concentrations of PCBs in indoor air or other exposure media, or establish uses of building space that mitigate exposure can be effective initial responses to identification of PCBs in a building. Mitigation measures also provide time for school officials to plan a longer-term remediation strategy and to secure the necessary resources. These longer-term strategies typically involve removal of caulk or other primary sources of PCBs as well as nearby masonry or other materials contaminated with PCBs by the primary sources. The costs of managing PCB-containing building materials from assessment through ultimate disposal can be substantial. Optimizing the efficacy and cost-effectiveness of remediation programs requires aligning a thorough understanding of sources and exposure pathways with the most appropriate mitigation and abatement methods. 相似文献
679.
H. Carolyn Peach Brown Barry Smit Olufunso A. Somorin Denis J. Sonwa Johnson Ndi Nkem 《Ambio》2014,43(6):759-769
Tropical forests are vulnerable to climate-change representing a risk for indigenous peoples and forest-dependent communities. Mechanisms to conserve the forest, such as REDD+, could assist in the mitigation of climate change, reduce vulnerability, and enable people to adapt. Ninety-eight interviews were conducted in three countries containing the Congo Basin forest, Cameroon, CAR, and DRC, to investigate perceptions of decision-makers within, and responses of the institutions of the state, private sector, and civil society to the challenges of climate change. Results indicate that while decision-makers’ awareness of climate change is high, direct institutional action is at an early stage. Adaptive capacity is currently low, but it could be enhanced with further development of institutional linkages and increased coordination of multilevel responses across all institutions and with local people. It is important to build networks with forest-dependent stakeholders at the local level, who can contribute knowledge that will build overall institutional adaptive capacity. 相似文献
680.
The demise of the soil fumigant, Midas, was heralded as a major environmental movement achievement, when Arysta LifeScience eventually deemed it economically non-viable and withdrew from US markets just before resolution of a lawsuit. Building on scholarship that focuses on strategy to understand how social movements sometimes win, we show how activist tactics were able to exploit the missteps of their opponents. These included the unreasonable expectations of Arysta for grower adoptions, the foibles of the director of California's Department of Pesticide Regulation in registering the chemical, and the reluctance of California's strawberry industry to discontinue use of methyl bromide. Although activist tactics, such as public comments and protests, had only a modest impact on the regulatory process, they had a major impact on grower adoptions of the chemical. This, together with a lawsuit that was not going well for the defendants, ultimately led to the withdrawal. Still, there was a great deal of luck involved, especially in the lawsuit in which the judge made rulings and statements favourable to the plaintiffs. Here, ‘scientization’, worked in favour of the movement rather than the industry. 相似文献