Biodiversity AQA AS

HideShow resource information


BIODIVERSITY is a general term used to decribe variety in the living world. Refers to the number and variety of living organisms in a particular area and has 3 components:

  • GENETIC DIVERSITY: Variety of genes possessed by the individuals that make up a species
  • ECOSYSTEM DIVERSITY: Range of different HABITATS within a particular area
  • SPECIES DIVERSITY: Number of different species and the number of individuals of each species within any one community. Has two components:
    • Number of different species in a given area
    • Proportion of the community that is made up of an individual species

The proportion in a community is important as 2 communities may have the same number of species BUT one community may have more % of a species than another.

1 of 2

Measuring Species Diversity

Measuring species diversity helps get a more accurate picture of an habitat. CAN COMPARE HABITATS BETTER as they may have the same no. of species and no. of individuals BUT different species diversity. 


d = species diversity index

N = total number of organisms of ALL species

n = total number of organisms of EACH species - HAVE TO WORK THIS OUT IN A SEPARATE COLUMN 

E (sign) = the sum of

The answer will be a decimal point. THE HIGHER THE D VALUE, GREATER SPECIES DIVERSITY

2 of 2


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Ecology, ecosystems and environmental biology resources »