B2.4 - Distribution of organisms

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  • Created by: Leyha M
  • Created on: 08-12-15 17:34

Distribution of organisms I

Abiotic factors that affect organisms:

  • temperature
  • availablility of nutrients (magnesium, nitrates)
  • amount of light
  • availability of water
  • availability of oxygen & carbon dioxide

Biotic factors that affect organisms:

  • disease
  • competition
  • predators
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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.

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