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The Mystery of the Disappearing Lake http://tncweeds.ucdavis.edu/photos/phrau05.jpg Phragmites austalis http://www.forestryimages.org/images/768x512/5241087.jpg Phragmites http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana22l.jpeg Phragmites Stomata http://www.ucmp.berkeley.edu/IB181/VPL/Ana/AnaP/Ana22l.jpeg 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
