lecture 5 macroevolution

lecture 5 macroevolution - BILD 3 April 9 2008...

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BILD 3 April 9, 2008 Woodruff: macroevolution 1 1 MACROEVOLUTION AND ADAPTIVE RADIATION CLASSICAL EXPLANATION. THE OUTCOME OF GRADUAL MICROEVOLUTIONARY CHANGES - GRADUAL ALLELIC SUBSTITUTION AND EXCLUSIVE ROLE OF NATURAL SELECTION. PHYLETIC GRADUALISM EVOLUTION SELDOM REVERSES ITSELF (DOLO’S LAW) TO ANY SIGNIFICANT EXTENT BECAUSE MANY GENES ARE INVOLVED AND MOST CHANGES ARE DELETERIOUS. THEREFORE EVOLVING TAXA DIVERGE FROM ONE ANOTHER. 2 ICONOGRAPHY OF THE BRANCHING BUSH CONES OF INCREASING COMPLEXITY 3 ADAPTIVE RADIATION AND THE EXPLOITATION OF NEW ENVIRONMENTS GALAPAGOS FINCHES (1 species EVOLVES INTO 13) HAWAIIAN HONEYCREEPERS (1 EVOLVES INTO 14) HAWAIIAN DROSOPHILA (FEW EVOLVE INTO 484) HAWAIIAN SILVERSWORDS HAWAIIAN CRICKETS (1 EVOLVES INTO 38) LAKE VICTORIA CICHLIDS (1 EVOLVES INTO 128) CONTRAST THESE CASES OF VERY RAPID SPECIATION WITH THE SLOWER DIVERSIFICATION OF MARSUPIALS IN AUSTRALIA (IN THE ABSENCE OF PLACENTALS) AND SHARKS (AFTER THEY ALMOST DIED OUT 200 MYA). 4 5 ADAPTIVE RADIATION BASED ON SELECTION FAVORING DIFFERENT BEAK TYPES SUITED FOR DIFFERENT FOOD TYPES 6 ADAPTIVE RADIATION OF HAWAIIAN HONEYCREEPERS
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