Investigating ecosystems (Edexcel GCSE Biology): Flashcards

Square frame enclosing known area to compare organism density

Investigate organism distribution & abiotic factor effects

Quadrats laid along a line

Ensures results represent whole sample area

Total organisms $div$ number of quadrats

Change in abiotic factors across habitat

Next to each other or at regular intervals

Estimate of area covered by organisms

Light intensity, soil pH, soil moisture

To see if factors correlate with distribution

Calculate mean organisms per $\text{m}^2$

Multiply mean per $\text{m}^2$ by total area

$1 \text{ m}^2$

No. of organisms, % cover, abiotic factors

Light meter, soil pH meter