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Transcript
BIODIVERISTY PP. 435-439 Species (organism) Population Community Ecosystem Biosphere BIODIVERSITY • • the variety of organisms in a given area Based on a measurement of species evenness and richness as well as genetic diversity • ↑species richness and ↑ evenness: ↑ stability (ability to withstand disturbances in the ecosystem) • High richness and evenness = High biodiversity • Sites A, C, and D have more richness • Sites A and C has the most evenness Which site has the highest biodiversity? MEASURING EARTH’S BIODIVERSITY ECOSYSTEM DESTRUCTION • Biggest threat to biodiversity due to habitat destruction • Loss of biodiversity results in community instability • • • • Extinction of species Imbalances (i.e. removing keystone species) Invasive species are the second largest threat An invasive species can out compete native species and often lack predators in the area ARROWS INDICATE MASS EXTINCTION • Currently in a time of high biodiversity • Estimated by 2030, 20% of species will be gone • Rainforest biome contains 1/5 of the world’s species but is quickly disappearing