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.
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