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Tom Haffie (1,170)
Lecture 4

Lecture 4 biodiversity.ppt

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Biology 1001A
Tom Haffie

Lecture 4: Biodiversity Myotis diminutus Rhabdias singaporensis Universal common descent and origin of species… How many species? Similarities due to descent from a single common ancestor Bio 1001A2012 Reverse tour of evolutionary history • Start at present day and climb down the tree of life • 8.7 million other species doing the same thing • Branching points on tree of life  rendezvous points • At each point, meet other species, and the group’s MRCA (‘concestor’) Optional viewing after lecture: Rendezvous Zero? MRCA of all humans Rendezvous 1: Chimps & bonobos “If we are descended from chimpanzees, why are there still chimpanzees around?” Rendezvous 2: Gorillas Rendezvous 3: Orang utans Rendezvous 4: Gibbons Rendezvous 5, 6: Old World & New World monkeys Rendezvous 7: Tarsiers Rendezvous 8: Lemurs and Lorises 5 species tarsier 50 species lemurs, lorises etc 58 mya 63 mya; MRCA of all primates End-Cretaceous mass extinction, 65 mya Rendezvous 10: Rodents & rabbits Rendezvous 11: Lau
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