Biodiversity Within A Community

Question 1

what is meant by species richness?

Answer 1

a measure of the number of different species in a community

Question 2

what does an index of diversity describe the relationship between?

Answer 2

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

Question 3

what is biodiversity?

Answer 3

used to describe variety in the living world

Question 4

what techniques can be used to reduce biodiversity?

Answer 4

farming techniques reduce biodiversity

Question 5

what are examples of some practices that have directly removed habitats and reduced species diversity?

Answer 5

• removal of hedgerows and grubbing out woodland
• creating monocultures, e.g. replacing natural meadows with cereal crops or grass for silage
• filling in ponds and draining marsh and other wetland
• over-grazing of land, e.g. upland areas by sheep, thereby preventing regeneration of woodland

Question 6

what is the calculation for index of diversity?

Answer 6

d=N(N-1) divided by the sum of n(n-1)

Question 7

what does ‘d’ represent in the calculation for the index of diversity?

Answer 7

index of diversity

Question 8

what does ‘N’ represent in the calculation for the index of diversity?

Answer 8

total number of organisms of all species

Question 9

what does ‘n’ represent in the calculation for the index of diversity?

Answer 9

total number of organisms of each species

Question 10

the higher the value of the index of biodiversity…

Answer 10

the more diverse the habitat

Question 11

what is needed to calculate an index of diversity?

Answer 11

• number of individuals of each species
• total number of organisms of all species