Investigating Populations (AQA A-Level Biology): Flashcards

Number of individuals of a species in a given area

Likelihood of finding a particular species in a quadrat

Proportion of quadrat area occupied by a plant species

Eliminates bias to produce reliable, significant results

To study gradual changes like succession along gradients

Capture, mark, release, recapture animals to estimate population

$\frac{\text{Sample 1 total} \times \text{Sample 2 total}}{\text{Marked recaptured}}$

Distribute evenly throughout population before recapture

Produces more reliable results

Tape measures at right angles + random number coordinates