Stream Ecology Biology 439

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Stream EcologyBiology 439

• http//www.montana.edu/wwwbi/staff/kerans/bio439/b
  io439.html

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(No Transcript)
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Introduction to global water resources

• Running watersunique habitat
• Evolutionary geological time scales
• Lotic (flowing water) more permanent then lentic
  (standing water) systems
• Major pathway of fauna from marine systems to
  land
• Geological permanencetime for unique fauna to
  develop

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Introduction to global water resources

• Why unique?
• Unique biota
• Unidirectional flow
• Linear form
• Unstable channel morphology (ecological time
  scales)
• Open systems
• High spatial temporal variability
• Hierarchical organization
• Variability high among streams

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II. Global water resources
Modified from van der Leeden et al. (1990)
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1,357,506,000 km3 total volume of water
1,320,000,000 km3 or 97.20 in the oceans
Modified from van der Leeden et al. (1990)
8,506,000 km3 or 0.65 fresh water on land and
air
29,000,000 km3 or 2.15 frozen water
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8,506,000 km3 freshwater on land and air
4,150,000 km3 or 48.77 ground water lt 1/2 mile
deep
4,150,000 km3 or 48.77 ground water lt 1/2 mile
deep
126,250 km3 or 1.5 lakes, rivers and streams
13,000 km3 or 0.16 as water vapor in the
atmosphere
67,000 km3 or 0.8 soil moisture and seepage
Modified from van der Leeden et al. (1990)
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III. Water resources of the US
Modified from van der Leeden et al. (1990)