How To Sample

Question 1

Samples that measure biodiversity

Answer 1

Chose an area
Count number of individuals
Use a process (plants=quadrat. Flying insects=sweep net. Ground insects=pitfall trap. Aquatic animals=net)
Repeat process
Use results to get an estimate of total amount of species
Compare results with the same technique

Question 2

Random sampling

Answer 2

Avoids bias. Use random number generator to derive coordinates

Question 3

Non random sampling

Answer 3

Systematic- samples are taken at fixed intervals often along a line E.g quadrat placed along a transect.

Oppurtunistic- sample chosen by the investigators. Will be biased

Stratified- different areas are sampled separately in a proportion to their part of the habitat as a whole

Question 4

Simpson diversity

Answer 4

D=1-(sum of: (total in one species/total number of organisms)²)

Question 5

Proportion of polymorphic gene loci

Answer 5

Number of polymorphic gene loci/total number of loci

Question 6

Standard deviation

Answer 6

S=square root of the sum of (x-mean)² / n-1