| Front | non-random sampling 4.2.1(b) |
|---|---|
| Back | non random - sample not chosen at random, 3 main techniques; - opportunistic (uses organisms that are conveniently available) - stratified (pops divided into number of strata based on particular characteristic, and random sample then taken from each strata proportional to size - systematic (diff areas within overall habitat identified, which are then smaple on, carried out using line/belt transect, systematic typically used to study how species change as you move from one pole to another - line transect marks line along ground between 2 poles and taking samples at specific points, belt transect provides more info as 2 parralel lines marked, and smaple taken of area between 2 lines |
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