BIOL 210 Lecture Notes - Lecture 14: Molecular Phylogenetics, Xiphophorus, Phylogenetic Tree
30 Oct 2014
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Document Summary
Falling on one"s sword: the swordtail"s tale became more complicated after publication of. Very similar species w/ sword: xiphophorus birchmanni female have not only lost the preference for swords, but actively discriminate against sworded males, is this hybrid-avoidance. Food colour drive: helen rodd et al. (2002) suggested that guppy females like orange male spots because they. Decoration preference: their analysis of food preferences showed that males use colours considered least appetizing in their bower decorations, suggest ancestral bowerbirds used inedible objects in decoration. Manipulate tail length and look at nest number. We see apositive association between tail length and number of nests male gets, females, offspring. Manipulated way beyond natural range: get really high mating success long-tailed. Chase away: the reproductive interests of the two sexes often differ, making reproduction a conflict zone. Holland and rice (1998) envisioned an arms race dynamic evolving over mating signals.
