News
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http://www.boston.com/news/nation/articles/2
009/09/30/senate_climate_bill_tougher_now_t
han_houses_version/
http://www.boston.com/news/nation/articles/2
009/09/30/epa_seeks_to_limit_chemical_runof
f_from_plane_deicing/
Photosynthesis
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50% of primary productivity is on land; 50%
in the ocean
6 CO2 + 6 H20 (+ light, nutrients,
Chlorophyll, trace elements, and
enzymes)C6H1206 + 602
Autotrophs vs. Heterotrophs
Chemosynthesis
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H2S +CO2Corg + SO4
http://www.divediscover.whoi.edu/vents/ventvideo.html
http://www.divediscover.whoi.edu/biology/video
.html
Primary Productivity
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Total Carbon fixed in gC/m2/day
GPP – respiration = net primary productivity
How can you measure net primary
productivity?
How can you measure NPP?
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Can measure by C14 uptake (HCO3-)
O2 production
nitrate uptake
Image courtesy of NASA
Factors that affect productivity
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Light
Nutrients
Water
Species
Aquatic Food Chain
Image courtesy of teachnet-lab.org
Terrestrial Food Chain