Hobbits Neand Evol rate 2010

Hobbits Neand Evol rate 2010 - Theories or models on the...

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Theories or models on the rate of speciation a. Gradualism change is slow and gradual enough change accumulates, we call something a new species Fossil evidence: transitional forms showing gradual change
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b. Punctuated equilibrium A species has a long period of equilibrium (little to no change), punctuated by a burst of change into a new species Perhaps through the mechanism of macromutation (a mutation with far-reaching results)
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What examples have we seen in the fossil record for human evolution? Punctuated equilibrium Gradualism Bipedalism! First H. erectus ? Within H. erectus (equilibrium) Archaic Homo sapiens (transitional between H. erectus and H. sapiens
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Mini-review of hominid lineage during the Pleistocene (1.8 mya - 10,000 ya) Homo habilis , 2.4-1.5 mya, only in Africa body not modern, cranium not modern Does have first larger brain than Australopithecine First to make stone tools Possibly had language. More meat, scavenged.
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Homo habilis 2.4 to 1.5 mya in eastern and southern Africa 500 to 800 (x of 680) ml John Gurche (Smithsonian Institution)
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Homo erectus , 1.8 mya - 250,000 ya (earliest H. ergaster ) First to radiate out of Africa First modern body (but stocky, muscular) Cranium not modern, but average size falls within modern size New tools: Acheulian hand axe Has language, shelter, fire, clothing By end is hunting rather than scavenging
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This note was uploaded on 10/04/2011 for the course ANTH 101 taught by Professor Simmons during the Spring '06 term at South Carolina.

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Hobbits Neand Evol rate 2010 - Theories or models on the...

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