lecture21-slides - 10/23/09 1 Causes Behavior Consequences...

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Unformatted text preview: 10/23/09 1 Causes Behavior Consequences Lecture 21: Friday Oct. 16, Professor Shaw Consequences of behavioral evolution I. Behavioral evolution and the origin of species A. The sexual selection model II. Behavioral evolution and species extinction Evolution of sexual signaling Reduction in gene Fow Reproductive isolation (= no interbreeding) Speciation by ???????? 10/23/09 2 … in regard to structures adapted to make one male victorious over another, either in fighting or in charming the female, there is no definite limit to the amount of advantageous modification Darwin, The descent of man and selection in relation to sex. 2nd edn., London, John Murray, 1882, p. 226. Hawaii is a geographically isolated archipelago Formation of a Hawaiian island occurs when molten lava comes to the surface through a “hotspot” in the earth’s mantel 10/23/09 3 (0.43 my) (0.75-1.9 my) (5.1 my) (2.6-3.7 my) Dan Otte (Philadelphia Academy) R. C. L. Perkins (British Museum) Subfamily Trigonidiinae (swordtail crickets) before 1994 : 10 species formally recognized after 1994 : 171 species formally recognized 10/23/09 4 L. kohalensis L. paranigra L. nigra L. pruna L. paranigra L. pruna L. nigra L. cerasina 10/23/09 4 L. kohalensis L. paranigra L. nigra L. pruna L. paranigra L. pruna L. nigra L. cerasina 10/23/09 5 PP 4.75 5.00 5.25 4.50 time (seconds) 1 2 3 kHz Laupala songs are produced by males and are simple in structure pk4363 100 100 92 77 81 98 100 100 90 95 100 100 100 100 77 100 100 94 69 100 96 67 52 77 100 100 100 100 100 100 100 100 99 89 60 96 73 Laupala Mendelson and Shaw (Nature 2005) Evolution of sexual signaling Reduction in gene Fow Reproductive isolation Laupala songs vary in pulse rate between species 10/23/09 6 What we did: 1. Collected males and females from 11 populations...
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This note was uploaded on 12/25/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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lecture21-slides - 10/23/09 1 Causes Behavior Consequences...

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