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Nutrients, Nitrogen, Nutrient Cycle, get me outta here - Coggle Diagram
Nutrients
Regimes
Eutrophic = well fed (trophic means nutrition
- High nutrients, high production
e.g. Upwelling areas, Coastal water
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Coastal Water
Terrestrial runoff, anthropogenic activity, riverive outputs
Oligotrophic: Poorly fed
*Low, nutrient, low productivity
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Nitrogen
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Primary Forms
Particulate organic N: N locked up inside living tissues (e.g. algae, zooplankton, fish)
Dissolved inorganic N: Highly available pool (nitrate, nitrite, and ammonium)
Dissolved Organic N: Consititues over 50% of natural soluble N (AA, proteins, polypeptides)
Nitrogen Processes
Inputs: Atmospheric deposition, riverine runoffs, submarine groundwater discharge
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N in the Marine Env't
Conservative Processes
- N2 Solubility
Henry's Law: Solubility of N2 in a liquid is directly proportional to the partial pressure of N2 gas directly above the liquid at a constant temperatureConcentration gradientC = KH * PN2 (search this up)-
- Lightning Mediated N2 fixation
Lightning fixes ~ 3- 10 teragrams of N2 globally annually (~1% of total natural N2 fixation)Lightning: Breaksdown N bond; forms nitric oxide and nitrogen dioxide (dissolved in raindrops or moisture creating nitric cid (HNO3) which falls to the ground as nitrates
Non-Conservative
Nitrogen Fixation
- Biological N2 Fix
- Atmospheric/abiological fix
- Industrial N2 Fixation
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Organisms
Diatom - Cyanobacteria Associations (DDAs) - e.g. Epithemnia as host to intracellulat cyanobacterial symbionts known as spheroid bidoeis
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Nitrification
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In absence, toxic ammonia is not converted into harmless nitrate
Nitrate under-oxidation
Nitrobacter (convert nitrite to nitrate) slows down first, leading to toxic accumulation
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Redox activity in water
Chemically active across multiple oxidation states in the presence of liquid water; ideal carrier of
Nutrient Cycle
Dissolved nutrient
Biological uptake, light
Phytoplankton
(particulate)
Zooplankton
Biogenic Detritus
Sinking particles
Sediments
Regeneration
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