Evolution and Biogeography

Geographic isolation

form of reproductive isolation in which two populations are separated physically by geographic barriers such as rivers, mountains, or stretches of water

Reproductive isolation

Separation of species or populations so that they cannot interbreed and produce fertile offspring

Number of extinctions on planet earth

five

biological indicator species aquatic

A species or organism, whose presence, lends insight to the overall health of the ecosystem

biological indicator species air

A species or organism, whose presence, lends insight to the overall health of the ecosystem

Species richness

the number of different species in a community

species evenness

the relative proportion of different species in a given area. The number of species / the total number of species.

most species rich ecosystems

tropical rain forests & coral reefs

Generalist and specialist species

see google doc

adapted beak 1

see picture

adapted beak 2

see picture