22-1: Community properties

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Presentation transcript:

22-1: 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?

3. Species- Area Effect: larger areas contain more species than smaller areas (many different niches)

The variety of organisms in a given area BIODIVERSITY The variety of organisms in a given area

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

Calculating Biodiversity Biodiversity index = # Species # Organisms

Calculating Biodiversity Biodiversity index = # Species # Organisms The closer to 1 the biodiversity index is, the more diverse and healthy the ecosystem is (higher the biodiversity)