Nutrients dissolved gasses
19 important questions on Nutrients dissolved gasses
Where play N and P an important role in?
What do N or P typically do?
Of what is phosphorus a component of?
Nucleic acids (RNA and DNA), adenosine triphosphate (ATP; energy transfer), and phospholipids (cell membranes).
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How does the phosphorus cycle work?
enzymes (phosphatase) to cleave inorganic P from organic molecules.
What three things do you need to know about P external loading?
1. Rock weathering is the primary natural source of P
2. Anthropogenic additions of P to ecosystems significant in many regions (Agriculture, urban runoff, sewage, and until recently, detergents)
3. Most P enters aquatic systems in the dissolved form
What two things do you need to know about P internal loading?
2. Under anoxic conditions, Fe3+ is reduced to Fe2+, and the Fe-PO4 complex breaks down
What are four implications of high lake productivity?
1. Low oxygen levels
2. Loss of habitat
3. Fish kills
4. Toxic algal blooms
What is the spiral length?
the distance over which one complete nutrient cycle occurs.
What determines the concentration of gases in natural waters?
Why do gases decrease their solubility with higher temperatures?
Greater molecular energy (higher T) results in gaseous molecules not being kept within liquid water matrix.
Why do ions increase their solubility with higher temperature?
Greater molecular energy (higher T) results in ions being further separated, and bonded form to be even less stable.
Two things you need to know about oligotrophic waters
1. O2-rich and nutrient-poor
2. TN (Total Nitrogen) levels consist mainly of organic N and nitrate (NO3-)
Three things you need to know about Meso-eutrophic waters
1. Variable O2 levels, medium nutrient levels
2. Nutrient abundance and type depends on O2-levels
3. TN consist of organic N and NO3 in surface waters, and
reduced forms of ammonia in bottom waters.
Three things you need to know about Eutrophic waters
1. O2-poor due to very high nutrient levels
2. “nutrient pollution”!
3. Aquatic animals are killed
Do low-order streams have high or low O2 concentrations?
What happens when CH4 enteres oxic (areobic) water?
It starts to get oxidized.
What two things are often used as a metric for lake productivity?
What are three human inputs of N into aquatic systems?
2. Atmospheric deposition
3. Human sewage
The downstream transport of a reactive solute is controlled by (3 things):
2. Physical-chemical processes (sorption & desorption)
3. Biological processes (uptake and storage in OM)
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