A-Level Biology Specification

AQA 7402

Section 4.6: Biodiversity within a community

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#4.6.1

Biodiversity can relate to a range of habitats, from a small local habitat to the Earth.

#4.6.2

Species richness is a measure of the number of different species in a community.

#4.6.3

An index of diversity describes the relationship between the number of species in a community and the number of individuals in each species.

#4.6.4

Calculation of an index of diversity (\(d\)) from the formula

\(d = \dfrac{N(N-1)}{\sum{n(n-1)}}\)

where \(N\) = total number of organisms of all species
and \(n\) = total number of organisms of each species.

#4.6.5

Farming techniques reduce biodiversity. The balance between conservation and farming.