BIO220H1 Lecture Notes - Lecture 3: Great Reed Warbler, Junglefowl, Barn Swallow
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As we will see, male choice occurs in some species, and is simply the reverse. Visual stimulation: long tailed widowbird, satin bower bird, scorpionfly, barn swallow, cichlid fish, field cricket, jungle fowl. Acoustical stimulation: field cricket, woodhouse"s toad, great reed warbler, t ngara frog. How to define which trait? e. g. tail feather. Experiment (4 treatment groups: natural tail length (n) control, reduced tail length (r, elongated tail length (l, sham surgery (s) cut the tail and glue it back additional control. Mating success (best) l > n = s > r (worst) R, n, s, l have about the same female nests about the same selection by females. The answer was no: tail length seems only to influence female choice. Experiment 1: reduction of eye spot number (clipping tail feathers) Another experiment: female preference for complex in t ngara frog. Why are male elaborations common: females prefer them, therefore selection for elaboration.