3.4.6 (biodiversity within a community)

Question 1

Species richness

Answer 1

A measure of the number of different species in a community

Question 2

Index of diversity

Answer 2

Relationship between the number of species in a community and number of individuals in each species

Question 3

Index of diversity formula

Answer 3

D = N (N-1) / n(n-1)
N = total number of organisms of all species
n = total number of organisms of each species

Question 4

How does farming affect biodiversity?

Answer 4

Reduces it
Monocultures- large areas with only 1 species
Overgrazing- prevents crop regrowth
Not rotating crops
Removal of hedgerows
Not rotating crops
Pesticides/fertilisers
Sewage in water ways

Question 5

Conservation techniques

Answer 5

Plant hedgerows instead of fences
Maintaining ponds/waterways
Reduce pesticide use or use biological control
Organic fertilisers
Rotate crops
Don’t cut grass verges until after flowering and seed dispersal
Introduce conservation areas where wildflowers and insects can breed