Freshwater environments

Xem 1-20 trên 27 kết quả Freshwater environments
  • This ancient Native American proverb and what it implies resonates today as it has become increasingly obvious that people’s actions and interactions with the environment affect not only living conditions now, but also those of many generations to follow. Humans must address the effect they have on the Earth’s climate and how their choices today will have an impact on future generations.

    pdf273p phoebe75 01-02-2013 21 8   Download

  • Over the past 25 years the discipline of ecotoxicology has undergone two major developments. Firstly, new assays have been developed, deploying organisms that bear added relevance to the specific environment under investigation. Several new procedures assess the effects on organisms after exposure to environmental samples rather than to spiked water or sediment samples.

    pdf274p crazy_sms 10-05-2012 28 7   Download

  • Freshwater sources and oceans have an amazing natural ability to break down some waste materials, but not in the quantities discarded by today' s society. The overload that results eventually puts the ecosystem out of balance. Sometimes nature itself can create these imbalances. But most often our waterways are being polluted by municipal, agricultural and industrial wastes, including many toxic synthetic chemicals which cannot be broken down at all by natural processes.

    pdf24p tainhacmienphi 19-02-2013 21 4   Download

  • Tham khảo sách 'freshwater supply', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf116p nt18102 24-05-2013 15 2   Download

  • The general objectives of the study are to evaluate the status and to find out scientific basis to develop freshwater prawn culture in brackish water, in order to diversify culture systems and species, to stabilize social-economics for inhabitants, and to adapt to the issues of sea level rise and saltwater intrusion in Mekong Delta.

    pdf25p change05 08-06-2016 8 1   Download

  • Wetland ecosystems are a natural resource of global significance.Historically, their high level of plant and animal (especially bird) diversity is perhaps the major reason why wetland protection has become a high priority worldwide, supported by international agreements, such as the Ramsar Convention and the International Convention of Biological Diversity (Fig. 1.1).

    pdf365p huetay_1 28-02-2013 33 17   Download

  • Part II: Planning a fish farm Figure 24: Setting up a fish farm Land, water and climatic conditions are probably the most important natural factors that need to be assessed. When developing a site for fish farming you should consider the effect it may have on the environment. Important natural areas

    pdf8p trasua1 24-09-2010 56 14   Download

  • References: Sources of Illustrations Figures for: Relationship among osmotic, matric, and combined soil water potential; Volume of solids, water, and air in a loam soil at saturation, Þeld capacity, and wilting point. Adapted from Brady, N.C. and Weil, R.R. 1996. The Nature and Properties of Soils. Prentice-Hall, Upper Saddle River, New Jersey. Figure for: Stable carbon isotope ratios. Adapted from Boutton, T.W. 1991. Stable Carbon Isotope Ratios of Natural Materials: II. Atmospheric, Terrestrial, Marine, and Freshwater Environments. In D.C. Coleman and B. Fry (Eds.

    pdf1p bengoan741 22-12-2011 38 10   Download

  • Global warming and changes in climate have already had observed impacts on natural ecosystems and species. Natural systems such as wetlands, mangroves, coral reefs, cloud forests, Arctic and high latitude ecosystems are especially vulnerable to climate‐induced disturbances. Enhanced protection and management of biological resources and habitats can mitigate impacts and contribute to solutions as nations and communities strive to adapt to climate change. Biodiversity is the foundation and mainstay of agriculture, forests, and fisheries.

    pdf268p yeurauxanh88 01-10-2012 39 6   Download

  • Over the past 25 years the discipline of ecotoxicology has undergone two major developments. Firstly, new assays have been developed, deploying organisms that bear added relevance to the specific environment under investigation. Several new procedures assess the effects on organisms after exposure to environmental samples rather than to spiked water or sediment samples. Also noteworthy is the considerable attention given to effects of chronic exposure to low levels of contaminants.

    pdf293p phoebe75 01-02-2013 18 5   Download

  • A brief synthesis of the state of the environment is given using the main themes in AEO-1 as the baseline, but discussing this within the context of the Brundtland report and the programme areas of NEPAD-EAP. Where appropriate, the general regional situation has been placed in the global context. Six thematic areas, forming the basis of the chapters, have been used in the analysis – Atmosphere, Land, Freshwater, Forests and Woodlands, Coastal and Marine Environments, and Biodiversity.

    pdf576p yeutinh98 26-09-2012 27 4   Download

  • Climate change can also be expected to have serious consequences on water resources. Melting glaciers, higher intensity and more variable rainfall events, and increasing temperatures will contribute to increased inland flooding, water scarcity and decreasing water quality. Overall, the greatest human requirement for freshwater resources is for crop irrigation, particularly for farming in arid regions and in the great paddy fields of Asia.

    pdf76p yeurauxanh88 01-10-2012 20 4   Download

  • From the early explorers onwards, visitors to the Arctic and to Antarctica have commented with great interest on the presence of lakes, wetlands, and fl owing waters. These environments encompass a spectacular range of conditions for aquatic life, from dilute surface melt ponds, to deep, highly stratifi ed, hypersaline lakes.

    pdf364p phoebe75 01-02-2013 20 4   Download

  • The World Bank’s mission is to alleviate poverty and support sustainable development. The conservation and sustainable use of natural habitats and biodiversity will contribute to these goals by protecting ecosystem services that are critical to fulfilling these objectives. Biodiversity is the foundation and mainstay of agriculture, forests, and fisheries. Biological resources provide the raw materials for livelihoods, sustenance, medicines, trade, tourism, and industry.

    pdf7p yeurauxanh88 01-10-2012 20 3   Download

  • It is fashionable and easy to say that we are ‘environmentalists’. The now famous 1992 Earth Summit in Rio de Janeiro has produced the environmentalist manifesto. Newsweek magazine's cover page on June 1, 1992 said the following: “No More Hot Air: It's Time to Talk Sense About the Environment.” Indeed, we all are environmentalists, until it comes to making some tough economic and political choices, like proposing or voting for a hefty tax on gasoline. This ambivalence about the environment is clear from the careful political statements quoted on the previous page.

    pdf0p tainhacmienphi 19-02-2013 22 3   Download

  • Human beings have a powerful effect on the environment, as is becoming increasingly clear. Demographic factors are commonly recognized as one of the primary global drivers of human-induced environmental change, along with biophysical, economic, sociopolitical, technological, and cultural factors. Concerns about demographic effects on the environment are

    pdf1p trinhosieupham 06-02-2013 20 1   Download

  • Aquaculture, also known as aquafarming, is the farming of aquatic organisms such as fish, crustaceans, molluscs and aquatic plants.[1][2] Aquaculture involves cultivating freshwater and saltwater populations under controlled conditions, and can be contrasted with commercial fishing, which is the harvesting of wild fish.[3] Mariculture refers to aquaculture practiced in marine environments and in underwater habitats.

    ppt31p ltanh04 25-05-2010 190 105   Download

  • Streptococcal disease caused by Streptococcus iniae is without doubt one of the major bacterial diseases in fish. It has been reported to cause significant mortality in more than 12 different aquaculture species. Its distribution is worldwide in both freshwater and marine environments. The annual impact to aquaculture has been estimated to be over US$100 million. However, in the past, very few reports have described its presence in Asia.

    doc15p vohnongnguyen 23-03-2010 150 39   Download

  • UNIT 2 : BIOMES AND ECOSYSTEMS Influenced by latitude, elevation, and associated moisture and temperature regimes, terrestrial biomes vary geographically from the tropics through the arctic and include various types of forest, grassland, shrub land, and desert. These biomes also include their associated freshwater communities: streams, lakes, ponds, and wetlands. Marine environments, also considered biomes by some ecologists, comprise the open ocean, littoral (shallow water) regions, benthic (bottom) regions, rocky shores, sandy shores, estuaries, and associated tidal marshes.

    pdf10p hanhphuc51 20-12-2010 37 7   Download

  • Carmago et al. (1992) found that the rivers nearer industrial discharge point have adverse impact to the environment as well as to macrobenthic communities. Toxic contaminants from surface runoff, sewage discharges and industrial discharge have caused negative impacts towards the freshwater macrobenthic communities. The presence of substance chemical such as ammonia, chlorine, cyanide, metals, PCBs, pesticides and phenols would caused a decline pattern on the number of species and changes in the species composition.

    pdf64p lulanphuong 28-03-2012 45 7   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản