Limnology Equipment

Question 1

Zooplankton

Answer 1

• Water Column: Schindler Trap
• Quantitative
• Count and identify zooplankton using Bogorov trays from concentrated, preserved samples taken with a Schindler
  trap

Question 2

Benthos

Answer 2

1. D-nets
2. Eckman dredge
   a) Mostly shallow zones
   b) Qualitative
3. Bogorov tray to examine preserved, concentrated samples

Question 3

Phytoplankton

Answer 3

• Net tow

Question 4

BOD (Biological Oxygen Demand) Apparatus

Answer 4

• Sample water at discrete depths in the water column
• Using bottles with a known volume and left in the water for a specific amount of time
• Measuring lake metabolism
• Measures the organic matter that can be decomposed
• Measures the oxygen (respiration and decomposition)
• More Organic C = higher BOD
• Quantitative

Question 5

YSI Meter

Answer 5

• Measure many variables such as salt oxygen concentration, pH, temperature, conductivity at a specific depth
• Quantitative

Question 6

Secchi Disk

Answer 6

• Measures how much light gets through the water at depth
• Looks at the amount of suspended sediments
• Qualitative

Question 7

Ekman Dredge

Answer 7

• Collects sediments
  Its a box with jaws
• Qualitative - because it leaks, don’t know the exact volume
• Benthos

Question 8

Plankton Net

Answer 8

• Catches plankton in a net (holes are 64 um)
• Qualitative - we don’t know the amount of water that can get through (if we put a flow meter on it and tracked distance it could be quantitative)
• There is a cup at the end

Question 9

Van Dorn Sampler

Answer 9

• Takes water samples at specific depths
• Used for water chemistry (can be used to look at dissolved oxygen)
• Quantitative - has a known volume

Question 10

Schindler Trap

Answer 10

• Collects zooplankton at various depths by using a box to capture water at a certain depth and as it is pulled back up to the surface the water runs through a net and the zooplankton is caught
• Quantitative

Question 11

Sediment Core and Extruder

Answer 11

• A long tube that keeps the structure of the sediments removed from a lake
• Used for paleolimnology
• There is a debate on whether it is qualitative or quantitative

Question 12

Light and Dark Bottles Underwater

Answer 12

• Measures the BOD, photosynthetic activity

Question 13

Chemical Oxygen Demand (COD)

Answer 13

• How much oxygen is oxidizable in water
• Uses strong oxidizers
• Will be higher than the BOD