ES 200 Lecture Notes - Lecture 7: Late Devonian Extinction, Eutrophication, Speciation

• School: NCSU
• Department: Environmental Science
• Course: ES 200
• Professor: Lada Kochtcheeva

Document Summary

Speciation + invasion extinction = biodiversity: speciation: evolution of new species (all life came from one single cell) Invasion: the movement of species into a new habitat: natural process, intended process, unintentional process, extinction: loss of species from earth. Speciation: requires separation of a subpopulation, behavioral separation (different food sources, physical separation (formation of a new river, chemical separation (pesticides, herbicides) Extinction: sea level drop due to ice age (440 million y. a. : mammoth extinction cause is unknown. Biodiversity: the variety or richness of life at all structural levels, molecular, genetic, species, ecosystem . Patterns of species distribution: endemic species: species found in a specific habitat, island, location, and nowhere else, antelope. Indigenous species: species naturally occurring in a location or several locations: rats, cosmopolitan species: species widely distributed, dandelion. Introduced (alien) species: intended: mongoose in hawaii, unintended: dutch elm disease in north america. Ghgs, etc: population: human overpopulation, to be exact.