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The Mystery of the Disappearing Lake
http://tncweeds.ucdavis.edu/photos/phrau05.jpg
Phragmites austalis
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Phragmites
http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana22l.jpeg
Phragmites
http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana22l.jpeg
Stomata
Phragmites
Phragmites
Water loss
Transpiration
Phragmites
Transpiration
Water uptake through roots
Water uptake through roots
So… why is transpiration higher in Phragmites than native species?
So… why is transpiration higher in Phragmites than native species?
• Stem density
So… why is transpiration higher in Phragmites than native species?
• Stomatal density
Stomata
So… why is transpiration higher in Phragmites than native species?
• Stomatal regulation
So… why is transpiration higher in Phragmites than native species?
• Dense root system
Detritus: Another piece of the puzzle
• Detritus is dead organic material from plants or animals
• Detritus from Phragmites is very slow to degrade
• Why might that cause the lake to get smaller?
Detritus: Another piece of the puzzle
• As detritus accumulates it starts to fill in the lake and raise the level of the land above the water level