Exam questions

Question 1

what is stratification

Answer 1

a process where water currents are driven by convection.
Lake stratification impacts on temp, DO, and nutrient availability which in turn determines the biota present.

Question 2

Spring stratification

Answer 2

Weak solar radiation
high degree of vertical mixing
saturation levls _> 100%
Nutrients = bioavailable
Water is 4 C

Question 3

Summer Stratification

Answer 3

Theres three parts of the water on the chart (Epilimnion, thermocline and Hypolimnion)
Solar radiation density
Atmosphere O2 (Epilimnion) Anoxic (Hypolimnion)
Storage of nutrients in hypolimnion.
Thermocline & water 4 C

Question 4

Autumn stratification

Answer 4

High degree of vertical mixing
Saturation levels _> 100%
Nutrients = bioavailable
water is 10 C

Question 5

Winter stratification

Answer 5

Ice formation density
Storage of nutrients in hypolimnion
Transport ice = algal growth
Snow & ice = winterkill
Water has ice, 1 C above thermocline and 4 C under thermocline