3.7 Mass Extinction and Biodiversity
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Define ‘Biodiversity’
Biodiversity is the total variation that exists amongst all living things
What are the three measurable components of biodiversity?
• Genetic Diversity • Species Diversity • Ecosystem Diversity
Define ‘Genetic Diversity’
Genetic diversity comprises the genetic variation shown by the NUMBER AND FREQUENCY OF ALLELES IN A POPULATION
Define ‘Species Diversity’
Species diversity comprises the species richness and the relative abundance of the ecosystem
What is ‘species richness’?
The number of species present in an ecosystem
What is ‘relative abundance’?
The proportion of each species in an ecosystem, e.g. the number of individual lions and zebra.
Define ‘Ecosystem Diversity’
The number of distinct ecosystems in an area