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10 Cards in this Set

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Q10
Temperature increase by 10 degrees Celsius equals a doubling in growth rate amongst phytoplankton.
Max growth rate: 3 cell divisions in 32 degrees celsius
0.5 cell divisions in the coldest waters
Key Limiting Nutrients in the Ocean
Nitrate:NO3 and Ammonium NH4
Phospate: PO4
Iron: Fe bound to ligands
Silicate: SiO2
Liebig's Law of the Minimum
Whichever nutrient is lowest in concecntration relative to nutritional needs of plants will limit growth rates.
Only one nutrient can be limiting at a time.
Redfield Ratio
C/N/P
106:16:1
Typical elemental ratios for phytoplankton and marine organisms.
Found in surface waters. Deep Ocean ratios show 15/1 because of denitrification which removes nitrate and not phosphate.
Anderson and Sarmiento
117/16/1 @ depths greater than 400M.
Deviations from Redfield Composition
Areas with denitrification will have high C/N , low N/P.
More plasticity in silicon and iron content.
Phosphate Distribution
At 2000 meter depth- Higher in North Pacific than in North Atlantic
Nitrate Distribution
Higher in North Pacific than in North Atlantic
Silicate Distribution
Higher in North Pacific than in North Atlantic
Iron Distribution
High in Arctic and Atlantic and Indian Ocean