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© 1998 International Society for Behavioral Ecology

research-article

Evolution of female mating preferences in stalk-eyed flies

Gerald S. Wilkinsona,, Heidi Kahlera and Richard H. Bakerb

aDepartment of Biology, University of Maryland, College Park MD 20742, USA bDepartment of Entomology, American Museum of Natural History 79th Street at Central Park West, New York, NY 10024, USA Department of Biology, Yale University New Haven, CT 06520, USA

Address correspondence to G. S. Wilkinson. E-mail: gw10{at}umail.umd.edu

ABSTRACT

Sensory exploitation predicts that female mate preferences exist before the evolution of exaggerated male ornaments. We tested this prediction by estimating female preference functions, remating intervals, and copulation durations for three species of stalk-eyed flies. Two species, Cyrtodiopsis whitei and C dalmanni, exhibit extreme sexual dimorphism in eye span, with eye stalks exceeding body length in large males. In contrast, C quinqucguttata of both sexes possess short eye stalks. Maximum parsimony analysis of 437 basepairs of the 16S mitochondrial ribosomal RNA gene from 6 Malaysian diopsids reveals that short, sexually monomorphic eye stalks are plesiomorphic in Cyrtodiopsis. Observations of multiple copulations by females in paired-choice mating chambers indicated that female C whitei and C. dalmanni exhibit relative preferences for longer eye stalks such that preference intensity increases linearly with the difference in eye stalk length between males. Females from the sexually monomorphic species showed no detectable preference for male eye stalk length. Female mating preferences of bodi sexually dimorphic species exhibited significant repeatability, as expected if genetic variation underlies the preference. In addition, female C whitei and C. dalmanni exhibited shorter copulations, mated more frequently, and rejected fewer mating attempts than female C quinqueguttata. Thus, opportunities for sperm competition have increased with acquisition of female preferences. We conclude that female sensory bias for males with long eye span did not exist in a common ancestor to these species. Instead, female preference and remating propensity either coevolved with eye span dimorphism or evolved after male eye stalks elongated.

Key words: Diopsidae, mate choice, sensory bias, sexual selection.


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