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Female frogs of many species show prefernces for calls with particular
properties. This study focuses on female prefernces in Hyla
ebraccata for computer-synthesized calls differeing in one of two call
properties, pulse repetion rate or dominant frequncy. Both of these call
properties are static acoustic properties of advertisement calls of H.
ebraccata (within-male CV less than 5%).
Females exert directional selection on dominant frequency. They preferred
low frequency calls (2960 Hz) to
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calls with the dominant frequency of the population median (3240 Hz).
Because size is negatively correlated with dominant frequency, female
choice could explain size-biased mating success observed in natural
populations. Females exerted stabilizing selection on pulse repetition
rate. They preferred calls with the population median pulse repetion rate
(99 Hz) to calls with a pulse repetition rate that was twice as fast (200
Hz).
Female choice creates either directional or stabilizing selection on
static properties of calls.
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