Chapter 9
A New Regime for Nutrient Turnover

BOD means:

1.   ?    Biochemical oxygen demand is a measure that show the amount of oxygen used in microbiological activity.
2.   ?    Biological oxygen deficit is a measure that show oxygen depleetion in the blood of vertebrates.
3.   ?    Biological oxygen demand is a measure that show the amount of oxygen that is needed in the decomposing process of organisms.

Eutrophication is:

1.   ?    A process which increases growth of plants in the water due to high loads of nutrients.
2.   ?    A process which increases growth of fishes in the water due to high loads of nutrients.
3.   ?    A process which decrease growth of plants in the water due to high loads of bluegreen toxic algae.

N, P and K means:

1.   ?    Nitrogen, Phosphorous and a constant for oxygen.
2.   ?    Nitrogen Phosphorous and Potassium.
3.   ?    Nitrogen, Potassium and cat ion content.

Redfield ratio is:

1.   ?    The relation of 16 atoms of Nitrogen for 1 atom phosphorous needed for algal growth.
2.   ?    A theory by J.B. Redfield which describe the number of eggs produced by trout in relation to nitrogen concentration in the water.
3.   ?    A value that describe the relation between nitrogen and oxygen above the halocline in pelagic water systems.

How does car traffic increase eutrophication?

1.   ?    In the combustion process nitrogen oxide is leaked to the athmosphere and nitrogen is a nutrient which can trigger eutrophication.
2.   ?    In the combustion process lead and other poisinous metals are released to the athmosphere leading to microbiological growth of nitrogenfixating algae.
3.   ?    In the combustion process phosphorous is leaked to the athmosphere and which can trigger eutrophication in water estuaries

Manure is:

1.   ?    Faeces and urine from animals
2.   ?    A redlisted species of Heraclium sometimes found in forest remnants on Jutland.
3.   ?    Urine from man.

Diatoms are:

1.   ?    Double atom compounds.
2.   ?    One cell algae
3.   ?    Double cell microalgae forming chains.

Fucus

1.   ?    A common plant in many households in the region with remarkable nitrogen fixating properties.
2.   ?    The latin (scientific) name of the genus to which Bladderwrack belong.
3.   ?    Microscopic invertebrates containing fungi which in turn indicate oxygen depletion.

Increasing eutrophication can change the relative growth of fish species so that:

1.   ?    Salmon and trout decrease while roach increase.
2.   ?    Salmon and trout increase while roach decrease
3.   ?    Herring, sprat and pike decrease while cod increase.

Chrysochromulina is:

1.   ?    An algae
2.   ?    A small bottom living animal that can survive severe oxygen depletion.
3.   ?    A freshwater mussle with very low nitrogen tolerance.

A limiting nutrient, what does that mean?

1.   ?    It means that if more of this nutrient is added eutrophication may increase.
2.   ?    It means that if more of this nutrient is added eutrophication may decrease.
3.   ?    It is a nutrient that when added decrease the effect of other nutrients.

Which nutrient is mostly the limiting one in the Baltic Proper?

1.   ?    Nitrogen
2.   ?    Phosphorous
3.   ?    There is no limiting nutrient

Which nutrient is mostly the limiting one in the Bothnian Bay?

1.   ?    Nitrogen
2.   ?    Phosphorous
3.   ?    There is no limiting nutrient.

Which nutrient is mostly the limiting one in Kattegatt?

1.   ?    Nitrogen
2.   ?    Phosphorous
3.   ?    There is no limiting nutrient.

What is sludge?

1.   ?    The bottom sediment of pelagic water systems
2.   ?    The sediment layer of freshwater aquifiers.
3.   ?    A restproduct from waste water treatment, rich in plant nutrient.