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排序方式: 共有238条查询结果,搜索用时 15 毫秒
111.
Kurunthachalam Senthilkumar William W. Bowerman Kelly F. Millenbah Dave A. Best Takumi Takasuga Shigeki Masunaga 《毒物与环境化学》2013,95(4-6):221-232
Population collapse of common tern (Sterna hirundo) from Lime Island in the St. Mary's River, Michigan, USA were related to the 2,3,7,8-chlorine substituted dioxins, furans, dioxin-like PCBs, and other possible factors using unhatch egg target contaminant analysis. The most toxic congeners, 2,3,7,8-TCDD/DF was found in all samples at noticeable concentrations. Magnitude of sum 2,3,7,8-PCDD/DFs were within the range of 39–93?pg/g wet wt. Dioxin-like PCBs were within the range of 360–1230?ng/g wet wt. Great Toxic Equivalent Quantity (TEQ) contributions by 2,3,7,8-TCDF, 2,3,4,7,8-PeCDF, 2,3,7,8-TCDD, 1,2,3,7,8-PeCDD, and dioxin-like PCBs such as CB-77, CB-126 and CB-105 are considered greatly due to their influence of poor embryo development and consequent damage of embryos of common terns in egg injection studies. However, other organochlorines, heavy metals, and/or synergistic effects also taken in to account. On the whole, TEQs in the tern eggs were greater than the Lowest-Observable-Adverse Effect Level (LOAEL) for bald eagle (Haliaeetus leucocephalus) embryos observed in British Columbia, Canada. Concentrations of dioxin-like PCBs, dioxins, furans in the St. Mary's River food chain are at levels for concern for nesting colonial waterbirds. Eventually, the possible movements of analyzed chemicals downstream from a man-made flood event are discussed. 相似文献
112.
Land-use planning is one aspect of sustainable development that determines the integrity of socioeconomic and ecological nuance. Land evaluation is an approach to sustainable land-use planning, which predicts the capability of the land-use system. This means that a specific land area should be under specific use, considering certain factors and characteristics of the land and its location. In other words, lack of proper information on land capability and rational and irrational use of land leads to destruction of land resources. This paper discusses the findings of ecological and socioeconomic resource issues for Minoo Island and the surrounded zone. The study covers an area of about 172km2 in southwest Iran. To establish environmental unit maps, digital layer maps of the soil texture were overlapped. The study empirically established that the area has the capability to accommodate ‘levels two’ urban and industrial development. Moreover, Minoo Island is considered to have potential for conservation and ecotourism, with a 60% potentiality for dryland farming. 相似文献
113.
Sridhar Rengarajan Sachithanandam Veeraragavan Mageswaran Thangaraj Ramesh Ramachandran 《国际发展与全球生态学杂志》2013,20(5):449-455
This paper applies the nearest-neighbour analysis to analyse the clustering of tourist attractions in Andaman region and suggests ecotourism development for Smith Island of North Andaman using remote sensing techniques. The results indicated that present tourism sites are distributed in clusters in three regions (Port Blair, Mayabunder and Diglipur). To avoid concentration of tourism sites and population pressure in one particular area, there is a need to promote tourism to other locations as well. The study provided suggestions for ecotourism development in Smith Island after analysing its various ecological features to support the Andaman Administration’s vision to promote ecotourism. 相似文献
114.
115.
The ecosystem of munseom area (MA) in Jeju Island, one of the marine protected areas in South Korea, has been continuously threatened by lack of management and pollution of the surrounding sea area. As a result, the South Korean government is trying to implement the systematic management plan to conserve the marine ecosystem of the MA. This article tries to obtain information about the conservation value of the MA. To this end, this study examines household willingness to pay (WTP) for conserving the MA employing the contingent valuation (CV) approach. A total of 1000 South Korean households were involved in the CV survey using a dichotomous choice question. The mean yearly WTP for the conservation is estimated as KRW 1763 (USD 1.50) per household. The national value expanded from the sample to the population is worth KRW 34.0billion (USD 29.0 million) per year. The results imply that the conservation is supported by South Korean households. 相似文献
116.
Hercock M 《Environmental management》2002,30(3):313-326
The apparently unresolvable differences between managing national defense and local conservation, public recreation, and scientific
research can be overcome through an advisory committee, with a strong and dedicated entity to drive the processes of governance
and change. The case of the Garden Island Environmental Advisory Committee shows how the organizational and political difficulties
of integrating state interests and federal concerns were met. Garden Island, off the coast of Perth, the capital of the State
of Western Australia, is a base for the Royal Australian Navy which is administered by the federal Department of Defence.
Examples are given of the committee's approach to integrated environmental management and the implementation of the Navy's
environmental policy. 相似文献
117.
Isla Victoria (Nahuel Huapi National Park, Argentina), a large island dominated by native Nothofagus and Austrocedrus forest, has old plantations of many introduced tree species, some of which are famed invaders of native ecosystems elsewhere.
There are also large populations of introduced deer and shrubs that may interact in a complex way with the introduced trees,
as well as a recently arrived population of wild boar. Long-standing concern that the introduced trees will invade and transform
native forest may be unwarranted, as there is little evidence of progressive invasion, even close to the plantations, despite
over 50 years of opportunity. Introduced and native shrubs allow scattered introduced trees to achieve substantial size in
abandoned pastures, but in almost all areas neither the trees nor the shrubs appear to be spreading beyond these sites. These
shrub communities may be stable rather than successional, but the technology for restoring them to native forest is uncertain
and probably currently impractical. Any attempt to remove the exotic tree seedlings and saplings from native forest would
probably create the very conditions that would favor colonization by exotic plants rather than native trees, while simply
clear-cutting the plantations would be unlikely to lead to regeneration of Nothofagus or Austrocedrus. The key to maintaining native forest is preventing catastrophic fire, as several introduced trees and shrubs would be favored
over native dominant trees in recolonization. Deer undoubtedly interact with both native and introduced trees and shrubs,
but their net effect on native forest is not yet clear, and specific management of deer beyond the current hunting by staff
is unwarranted, at least if preventing tree invasion is the goal. The steep terrain and shallow soil make the recently arrived
boar a grave threat to the native forest. Eradication is probably feasible and should be attempted quickly. 相似文献
118.
William L. Halvorson Dennis B. Fenn William R. Allardice 《Environmental management》1988,12(1):109-118
The multifaceted development of an erosion surface on Santa Barbara Island, Channel Islands National Park, California, has led to this study of the relationship between soils and vegetation. A dry Mediterranean climate and past attempts at farming and introductions of alien species have led to vegetative degradation accompanied by both gully and surface erosion. Soil and vegetation analyses show this erosion to be in a location of transition. The soils are Typic Chromoxererts (Vertisol Order) with high clay, salinity, and sodium contents. The vegetation is ecotonal in nature, grading from a principally alien annual grassland withAvena fatua andAtriplex semibaccata to a shrub community dominated by the nativeSuaeda californica. Management toward revegetation and stabilization of this island ecosystem will be difficult with high clay, saline-sodic soils and disturbed vegetation. 相似文献
119.
黑瞎子岛位于中俄边界抚远县境内,原始生态环境良好,自然资源丰富,泡沼星罗棋布。为了在开发中保护岛内自然生态景观和湿地生态功能,应科学划分保护区范围、明确土地权属界限、建立生态补偿机制。 相似文献
120.
基于3S技术的琅岐岛景观空间格局分析 总被引:1,自引:0,他引:1
以景观生态学理论为基础,选取2006年和2010年覆盖琅岐岛的遥感影像,利用3S技术,提取研究区两个时期的景观类型。然后选取斑块大小、斑块数量、斑块密度、面积加权平均形状指数和香农多样性指数等景观生态指标,从景观的基本构成、景观水平的破碎化与多样性、不同景观斑块的空间格局特征等方面分析琅岐岛的景观格局,并提出对研究区合理规划土地开发利用的建议。 相似文献