GEOG 1001 Lecture : GEOG 1001 Lecture 16 Favela Methods
Document Summary
Delineates species by properties possessed by populations: cons: hard to apply this concept to extinct species. And the occasional hybridization events between individuals in populations that are reproductively isolated. Finally, it is restricted to sexual species: phylogenetic species concept, species is the smallest monophyletic group distinguished by a shared derived character, pros: determines an appropriate taxonomic level at which to draw species boundaries. Does not require information about gene flow: cons: divides up organisms into more fine-grained species categories than may seem appropriate. Does little to ensure that species will have separate evolutionary fates in the future. Some sort of cline a spatial gradient in the frequency of phenotypes or genotypes exists in nature because adjacent populations experience somewhat different selective conditions. Speciation occurs due to intrinsic factors within the population: ex: cichlid fish in lake apoyo and the apple maggot fly. What are the predictions of the resource competition model: food distribution, positive assortative mating.
