BionB Lecture 10/16/09 Causes → Behavior –> Consequences Consequences of behavioral evolution I. Behavioral evolution and the origin of species A. The sexual selection model B. The reinforcement model Basic Model: Evolution of sexual signaling → Reduction in gene flow → Reproductive isolation Speciation by ???-number of mechanisms that could be responsible for the process above. Darwin quote-organisms may evolve in many different ways, and they are checked more by mechanism that drives it – female choice: can be variable-geographic isolation-islands: formed by process illustrated in diagram-hotspot in earth's mantle, and as hot spot moves from southeast to northwest, volcanic eruptions occur and form massive volcanos; pacific plate moves northwest and as it moves, volcanic masses move with it and island masses are formed in a chain-Subfamily Trigonidiinae (swordtail crickets)-before 1994: 10 species formally recognized-after 1994: 171 species formally recognized-hawaii

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