ENVS 2420 Lecture 3: Biodiversity (2 part lecture)

• School: York University
• Department: Environmental Studies
• Course: ENVS 2420
• Professor: Laforet

Document Summary

Taxonomy --> description, naming and classification of species. Systematics --> study of the evolution of life forms and the relationship among species through time phylogeny --> evolutionary history of a species. Speciation -- > evolution of new species, often through separation of a population into two or more reproductively isolated units. Allopatric speciation --> occurs when a single pop"n becomes spatially subdivided into multiple subpon"s. Sympatric speciation --> occurs when a single pop"ns forms a genetically distinct subpop"ns with no spatial isolation (gene flow can occur) Kingdom --> phylum ---> class --> order --> family --> genus --> species. All living organisms are related through common ancestry and descent: generia (plural) Species --> group of interbreeding pop"ns that are reproductively isolated from other such groups. Biodiversity= biological diversity --> structural and functional variety of life forms at genetic, Shift from endangered species ethic to an ecosystem funciton ethic surrounded around biodiversity in conservation efforts.