11-4: Community properties

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Presentation transcript:

11-4: Community properties PP. 435-439

Species (organism) Population Community (interaction of different species) Ecosystem Biosphere

PROPERTIES OF A COMMUNITY Species Richness: The number of species in an area

PROPERTIES OF A COMMUNITY Species Richness: The number of species in an area Species Evenness: the abundance of each type of species

Which has more species richness? Which has more species evenness?

BIODIVERSITY The variety of organisms in a given area Based on a measurement of species evenness and richness

BIODIVERSITY 10-30 million species with most biodiversity in insects

Biodiversity index A quantitative measurement of biodiversity Ecologists can better understand community structure Biodiversity index = # Species # Organisms

Sites A, C, and D have more richness Sites A and C has the most evenness Which site has the highest biodiversity?

Calculating Biodiversity Biodiversity index = # Species # Organisms The closer to 1, the healthier the ecosystem (able to withstand disturbances)

FORCING BIODIVERSITY Non-native species: a species that is introduced into a community by humans Invasive species: a non-native species that has the ability to spread quickly and cause damage to native environment Usually has no natural predator

California invasive species Fire Ant Ice Plant Yellow Star Thistle Mosquito Eating Fish

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