ANTH 350 Lecture Notes - Lecture 5: Parapatric Speciation, Congo River, Allopatric Speciation
Document Summary
Tries to work out which traits are more evolutionary informative and important. Cladogram figure out which traits are derived, which are shared. Assumes parsimony --- assumes unlikely characteristic evolve then evolves again later. Look for thing that takes the least amount of steps. Species is actually a pretty complicated concept. Interbreeding populations reproductively isolated from other such populations . Not discreet categories most of the time. Important because speciation divides could determine endangered species. May breed in captivity, but do not breed in nature even when they overlap. Ex: lions and tigers: other species concepts. Evolutionary species concept- deals with the fossil record. Cant directly observe really long timeframe must be considered. Recognition species concept- something signaling between species that ids someone as like them as possible mate: reproductive isolation mechanisms. Prezygotic isolation- ecological, seasonal, ethnological, physiological, mechanical, gametic mortality. Postzygotic isolation- cytological, zygotic mortality, hybrid invariability, hybrid sterility, hybrid breakdown: formation of species.
