BIOL 321 Lecture Notes - Lecture 21: Black-Throated Blue Warbler, Ronald Fisher, Russell Lande
9 Apr 2016
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Outline: what drives sexual selection, 2 processes, 2 time frames: intra- vs inter-sexual selection pre- and post- copulation, evolutionary models of mate choice: Evolutionary models of mate choice (3) runaway sexual selection. = a male trait co-evolves with a female preference: trait becomes increasingly exaggerated, ronald fisher (1930, russell lande (1981) = co-evolution ( runaway ) until evidence for runaway is rare. Evolutionary models of mate choice (4) sensory bias. = female mating preferences arise as a byproduct of pre-existing biases original bias probably evolved in non-mating context, eg food colour. Guppies exhibit varying patches of orange (carotenoids: females prefer male with most orange, orange males suffer high predation, trait and preference altered in. Featured research testing the sensory bias hypothesis in guppies: rodd et al 2002. Guppies (poecilia reticulata) attracted to orange fruits. Placed small color discs on leaf in water. Recorded all approaches and pecks by m & f. Males and females were attracted to orange discs.
