BIOL 1020U Lecture Notes - Lecture 6: Sympatric Speciation, Carl Linnaeus, Ecological Niche
Document Summary
Morphological species concept: species can be categorized based on their physical characteristics. Organisms are classified as the same species if their anatomical traits appear to be similar. The traditional way of describing species,going back to the latin naming system created by swedish biologist carl. Works where (cid:272)lear groups are defi(cid:374)ed (cid:271)y relia(cid:271)le characters. Not so useful for species with lots of intraspecific variation. Biological species concept: if variants can freely interbreed in nature and produce fertile, viable offspring they are considered the same species. Phylogenetic species concept: the use of objective markers of shared common ancestry from molecular sequences to determine what is a species. Ecological species concept: each species occupies an ecological niche, which is the unique set of habitat resources that a species requires, as well as its influence on the environment and on other species. General lineage concept: each species is a population of an independently evolved lineage.
