measuring abiotic factors. each ecosystem has its own abiotic factors different factors for… –...
TRANSCRIPT
Measuring Abiotic Measuring Abiotic FactorsFactors
Each ecosystem has its own abiotic factors
Different factors for…– Marine ecosystems– Freshwater ecosystems– Terrestrial ecosystems
Marine Ecosystem abiotic factors
Salinity pH Temperature Dissolved oxygen Wave action
Freshwater Abiotic Factors
Turbidity Flow velocity pH Temperature Dissolved oxygen
Terrestrial Abiotic Factors
Temperature Light intensity Wind speed Particle size Slope/aspect Soil moisture Drainage Mineral content
How?
Most of these measurements are done with dataloggers.– Probe connected to a calculator that reads the
measurement
pH
7 is neutral Values in freshwater range from slightly
basic to slightly acidic Seawater is usually above 7. Terrestrial: use a soil testing kit, match
color
Wind
Determined by the beaufort scale Use an anemometer Hand held wind propeller
Mineral Content
Weigh soil sample, Heat 500-1000C for several hours
– Allows volatile substances to escape
Whatever is left is the mineral content
Flow Velocity
Time how long it takes a floating object to travel a particular distance.
Or use flowmeter
Salinity
Determine the conductivity of a solution (higher salt is highly conductive)
Or by density of water (higher salt-more dense)
Dissolved Oxygen
Electrodes Titration Dissolve tab
Turbidity
Cloudy water has high turbidity
Turbidity affects the penetration of sunlight and therefore the rate of photosynthesis
Use a Secchi disc-lowered into the water until it is out of sight,
measure the scale of the line or pole.
Let’s try it!