Freshwater Ecology: Nutrients and Biogeochemistry
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Questions and Answers

What are the three major nutrients found in all biological tissues?

Carbon, Nitrogen, Phosphorus

List the different forms of phosphorus mentioned in the text.

PO4, TP (particulate), Organic and inorganic forms

What are the common components found at all trophic levels?

Carbon, Nitrogen, Phosphorus

What is the most abundant gas in the Earth's atmosphere?

<p>Dinitrogen gas (N2)</p> Signup and view all the answers

Name some organic compounds where nitrogen is an integral component.

<p>Amino acids, proteins, urea, DNA, RNA</p> Signup and view all the answers

Describe the different oxidation states in which nitrogen can be found.

<p>Both oxidized species (e.g., nitrate (NO3) and nitrite (NO2)) and reduced species</p> Signup and view all the answers

What are the main forms of dissolved phosphorus in aquatic systems?

<p>DOP and DIP</p> Signup and view all the answers

Describe the process of nitrification by chemotrophs.

<p>(NH4 + O2 -&gt; NO3 + 2H+)</p> Signup and view all the answers

What is the principal site for nitrification and denitrification in Lake Rotoiti, NZ?

<p>Oxycline at 20-25m</p> Signup and view all the answers

When does nitrogen fixation by heterocystic cyanobacteria show maximum activity?

<p>When DIN is limited</p> Signup and view all the answers

What are the main forms of particulate organic matter in aquatic systems?

<p>PON and POP</p> Signup and view all the answers

Explain the process of denitrification by anaerobic heterotrophs.

<p>(NO3 + DOM -&gt; N2 + CO2)</p> Signup and view all the answers

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