Unit 3 - KA 7 & 8 - Mass Extinction and Threats to Biodiversity
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Disappearance of many groups of living organisms at the same point in time
Mass extinction
Variety and relative abundance of species
Biodiversity
Number and frequency of alleles in a population
Genetic diversity
Measure of species richness and relative abundance
Species diversity
Variety of different ecosystems in a defined area
Ecosystem diversity
Numbers of an organism compared with others in a community
Relative abundance
Number of different species in a community
Species Richness
Inability of a species to evolve due to lack of genetic diversity
Bottleneck effect
Very small area of isolated habitat
Habitat fragmentation
Link between pieces of habitat in which species can feed, mate and pass through
Habitat corridor
Species that has been brought by humans from one geographical location to another
Intorduced species
Introduced species that has taken a place in the wild community
Naturalised species
Introduced species that has become naturalised in and then harmful to its community
Invasive species
Changes in long term weather patterns brought about by changes in the temperature of the Earth
Climate Change
Species adapted to the edges of habitats
Edge species