13.07.2015 Views

Water for people.pdf - WHO Thailand Digital Repository

Water for people.pdf - WHO Thailand Digital Repository

Water for people.pdf - WHO Thailand Digital Repository

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

6Table of contentsSignificance of Freshwater Ecosystems 131Characteristics of freshwater ecosystems 131Uses and benefits of freshwater ecosystems 131Table 6.1: Simplified classification of services provided by water ecosystems 132ProtectingEcosystems <strong>for</strong>People and PlanetBy: UNEP (United NationsEnvironment Programme)Collaborating agencies:UNECE (United Nations EconomicCommission <strong>for</strong> Europe)/<strong>WHO</strong> (WorldHealth Organization)/UNCBD(United Nations Secretariat of theConvention on BiologicalDiversity)/UNESCO (United NationsEducational, Scientific and CulturalOrganization)/UNDESA (UnitedNations Department of Economic andSocial Affairs)/UNU (United NationsUniversity)Pressures on Freshwater Ecosystems 132Table 6.2: Pressures on freshwater ecosystems 133Box 6.1: Draining wetlands <strong>for</strong> malaria control: a conflict of interests? 133Table 6.3: Types of pollutants affecting freshwater ecosystems 134Figure 6.1: Emissions of water pollutants by sector 134Taking the Measure of Ecosystem Health 135<strong>Water</strong> quality indicators 135Figure 6.2: Biological quality of United Kingdom rivers, 1990–2000 136Hydrological in<strong>for</strong>mation 136Biological assessment 136Table 6.4: Quality indicators <strong>for</strong> classifying the ecological status of rivers 137Box 6.2: Non-native species 138Assessment of Current Ecosystem Condition and Trends 138Global condition of freshwater ecosystems 138Map 6.1: Relative naturalness of land in major world river basins 139Changes in freshwater biodiversity 141Table 6.6: Numbers of threatened freshwater fish in selected countries 141Table 6.7: Threatened inland water species: a selection of species assessedby IUCN as Critically Endangered in 2000 142Figure 6.3: Proportion of United States species at risk or extinct, bytaxonomic grouping 142Figure 6.4: Living Planet index 1999: inland waters 143Lakes 143Figure 6.5: Changes in lake condition, 1960s–1990s 143Wetlands 143Table 6.8: Examples of wetland loss in arid Eurasia 144Box 6.3: Protecting ecosystems in the Lake Pskovkoe watershed 145Rivers 144

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!