BIO152H5 Lecture 19: Lecture 19 Female Choice.docx
Document Summary
Lecture 19 female choice ch 25 sec 25. 6. Benefits of female choice (direct + indirect) Female choice: the behaviour a female shows in choosing a mate (preference behaviour)) that biases the mating success of males toward the preferred type. ex. bowerbird: females look at the males nest decoration and appearance is chosen. Natural tail (n) / reduced tail (r) / elongated tail (l) / sham surgery (s) - cut & put tail back. Mating success: elongated > natural > shortened. After tail manipulation, reduced tails fell to less nest number. attracted few numbers. normal and sham had no difference. Lengthened tails increase to more nests/male meaning more females were attracted and mated with the elongated males. Textbook experiment: females prefer males with long tails. -> females were found to prefer long tailed males. -> long tailed males are more efficient in flight & more successful in finding food = higher fitness. Female preference of complex cells in tungara frog.
