BIOL 302 Lecture Notes - Littoral Zone, Limnetic Zone, Character Displacement
22 Nov 2012
School
Department
Course
Professor
Document Summary
The most compelling evidence for competition is demonstration character displacement. Competition should lead to divergence in characters of species in areas where they co-occur (sympatry), compared to areas where each lives alone (allopatry) Character displacement may be reproductive or ecological; both required for speciation. Avoid interbreeding which lead to selection of sexual signals and ability to recognize those signals. Characters may have similar values in areas where species are separated but in areas of divergence, there should be a difference in character value. Infers that the two s pecies diverges which is a result of evolutionary character displacement. Phenotypic differences in sympatry should result from evolutionary shifts. Phenotypic differences should related to resource use. Sites of symatry and allopatry should be similar. Environment is not very different between those two sites. Should be evidence that that similar phenotypes compete for resources. Replicate tests to eliminate any local effects. *competition and character displacement in stickleback (schluter 1994)
