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排序方式: 共有214条查询结果,搜索用时 109 毫秒
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Danz NP Niemi GJ Regal RR Hollenhorst T Johnson LB Hanowski JM Axler RP Ciborowski JJ Hrabik T Brady VJ Kelly JR Morrice JA Brazner JC Howe RW Johnston CA Host GE 《Environmental management》2007,39(5):631-647
Integrated, quantitative expressions of anthropogenic stress over large geographic regions can be valuable tools in environmental research and management. Despite the fundamental appeal of a regional approach, development of regional stress measures remains one of the most important current challenges in environmental science. Using publicly available, pre-existing spatial datasets, we developed a geographic information system database of 86 variables related to five classes of anthropogenic stress in the U.S. Great Lakes basin: agriculture, atmospheric deposition, human population, land cover, and point source pollution. The original variables were quantified by a variety of data types over a broad range of spatial and classification resolutions. We summarized the original data for 762 watershed-based units that comprise the U.S. portion of the basin and then used principal components analysis to develop overall stress measures within each stress category. We developed a cumulative stress index by combining the first principal component from each of the five stress categories. Maps of the stress measures illustrate strong spatial patterns across the basin, with the greatest amount of stress occurring on the western shore of Lake Michigan, southwest Lake Erie, and southeastern Lake Ontario. We found strong relationships between the stress measures and characteristics of bird communities, fish communities, and water chemistry measurements from the coastal region. The stress measures are taken to represent the major threats to coastal ecosystems in the U.S. Great Lakes. Such regional-scale efforts are critical for understanding relationships between human disturbance and ecosystem response, and can be used to guide environmental decision-making at both regional and local scales. 相似文献
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Negri A Burns K Boyle S Brinkman D Webster N 《Environmental pollution (Barking, Essex : 1987)》2006,143(3):456-467
This study examined the concentrations of total hydrocarbons (THC), polychlorinated biphenyls (PCB), polyaromatic hydrocarbons (PAH), and trace metals (Cu, Zn, Cd, Pb, Hg and As) in marine sediments off Scott Base (NZ) and compared them with sediments near the highly polluted McMurdo Station (US) as well as less impacted sites including Turtle Rock and Cape Evans. The Antarctic mollusc, Laternula elliptica and three common sponge species were also analysed for trace metals. The mean THC concentration in sediments from Scott Base was 3 fold higher than the pristine site, Turtle Rock, but 10 fold lower than samples from McMurdo Station. McMurdo Station sediments also contained the highest concentrations of PAHs, PCBs and the trace metals, Cu, Zn, Pb, Cd and Hg. Copper was significantly higher in bivalves from McMurdo Station than other sites. Trace metal concentrations in sponges were generally consistent within sites but no spatial patterns were apparent. 相似文献
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Dick Oepkes G. C. Page-Christiaens Caroline J. Bax Mireille N. Bekker Catia M. Bilardo Elles M. J. Boon G. Heleen Schuring-Blom Audrey B. C. Coumans Brigitte H. Faas Robert-Jan H. Galjaard Attie T. Go Lidewij Henneman Merryn V. E. Macville Eva Pajkrt Ron F. Suijkerbuijk Karin Huijsdens-van Amsterdam Diane Van Opstal E. J. Verweij Marjan M. Weiss Erik A. Sistermans and for the Dutch NIPT Consortium 《黑龙江环境通报》2016,36(12):1083-1090
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Diane R. Smith 《补救:环境净化治理成本、技术与工艺杂志》1993,3(2):183-192
Regulatory agencies are involved in analysis of plans for, and results of, virtually every environmental site investigation and remediation project. Controlling the cost of such projects is largely dependent on arriving at a reasonable scope of work. Regulatory approval is heavily influenced by the approach, cooperation, level of expertise, communication skills, preparation, and diplomacy of those who interact directly with agency personnel. Agencies also can be sources of assistance in obtaining the cooperation of other responsible parties. This article discusses a practical approach to maximize assistance, cooperation, and collaboration from regulatory agencies. 相似文献