ANT101H5 Lecture Notes - Acheulean, Zhoukoudian, Hand Axe
Document Summary
4mya 1 mya time of a diversity. More species are adaptive to semi-forested areas. Why is there so many species at this time and not afterwards? (page 228) They didn"t travel much and tended to stay in small groups while interbreed in small groups (genetic drift) Increasing diversion of genetic groups and speciation due to lack of travel. People generally assumed there was a gradual increase in brain size. When you take into account their body size differences, (ratio or brain and body size), it is flat line in terms of brain size for 3 million year. Therefore not a lot of change in brain size. There is an increase in brain size from the pre-australopiths. There is an increase in the later homo line. Starting a trajectory a longer biological development in children. Later australopiths & early homo overlap for more than a million years. On the landscape at the same time for over 1 million years.
