Investigating ecosystems (Edexcel GCSE Biology Combined Science): Flashcards

Square frame enclosing known area to compare organism distribution

Ensures results represent whole sample area

Quadrats laid along a line

Non-living factors affecting organism distribution (e.g. light, pH, temperature)

$\frac{\text{Total organisms}}{\text{No. of quadrats}}$

Change in abiotic factors across a habitat

Estimate percentage cover

Investigate distribution of organisms and effects of abiotic factors

Mean per m² × total habitat area

See if factors correlate with distribution changes