The number and frequency of all alleles within a population
After a bottle neck event
The species may have lost some of its genetic diversity, and this may limit its ability to adapt to changingconditions
Species diversity
Comprises the number of different species in an ecosystem (the species richness) and the proportion of each species in the ecosystem (the relative abundance)
A community with a dominant species has a lower species diversity than one with the same species richness but no particularly dominant species
Ecosystem diversity
Refers to the number of distinct ecosystems within a defined area
