Distribution of organisms I
Abiotic factors that affect organisms:
- availablility of nutrients (magnesium, nitrates)
- amount of light
- availability of water
- availability of oxygen & carbon dioxide
Biotic factors that affect organisms:
Distribution of organisms II
Quantitative data can be obtained by:
Random sampling w/ quadrats
Place quadrat randomly.
Could use random coordinates.
Calculate percentage cover.
Sampling along a transect
Lay out a measuring tape.
Use the quadrat at regular intervals.
Place quadrat on line + calculate percentage cover of organism.
Same time measure abiotic factor.
repeating experiments improves the validity of results. rules out anomalies.