Abundance and distribution

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Abundance and distribution of water on earth
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Distribution of water on earth
Oceans 97.2 Icecaps 2.1 Groundwater 0.6 Lakes
0.02 Atmosphere 0.001 Rivers 0.0001
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Total renewable freshwater supply (2000)
Unit Cubic meter per person year
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By 2050 global water scarcity will increase
due to population growth (9 billion)
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gt50
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Ground-and Surface Water withdrawals
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Pressure on Freshwater Use is detrimental to
fishes
Many fish species around the world are still
unknown
Lets look at trends for North America where taxa
is reasonably well-studied 720 species of
freshwater fish in North America
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Out of 720 species
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Summary of species concerns Aquatic Species at
greater risk
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The Sixth Extinction
Pressure on Water Use is high and
increasing Severe decline in biodiversity of
aquatic vertebrates 1. Habitat
destruction dewatering, dams, development 2.
Harvest especially marine species 3. Exotic
species worldwide transport of species Watch
the movie Chapter 10 study questions 1,2,3,7,9,12