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Sexual signal loss: the link between behaviour and rapid evolutionary dynamics in a field cricket

Research output: Contribution to journalArticle

Author(s)

Marlene Zuk, Nathan W. Bailey, Brian Gray, John T. Rotenberry

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Abstract

1. Sexual signals may be acquired or lost over evolutionary time, and are tempered in their exaggeration by natural selection.

2. In the Pacific field cricket, Teleogryllus oceanicus, a mutation (“flatwing”) causing loss of the sexual signal, the song, spread in <20 generations in two of three Hawaiian islands where the crickets have been introduced. Flatwing (as well as some normal-wing) males behave as satellites, moving towards and settling near calling males to intercept phonotactic females.

3. From 2005 to 2012, we surveyed crickets and their responses to conspecific song, noting the morph and number of males and females before and after experimental playbacks. The three Hawaiian islands consistently contained different proportions of flatwing crickets, ranging from about 90% of males on Kauai to 50% on Oahu to rare on the Big Island of Hawaii.

4. Flatwing and normal-wing males do not appear to differ in responsiveness to playback, a behaviour that should influence the likelihood of a male encountering a phonotactic female. Instead, male and female crickets from populations in which little to no calling song is perceptible during development tended to seek out callers more readily than crickets that developed in noisier environments. Such increased phonotaxis makes females more likely to find either the caller to which they are responding or to encounter a flatwing (or normal male satellite) that has also been attracted to the song.

5. Our evidence suggests that pre-existing behavioural plasticity (manifest as flexible responses to social—particularly acoustic—information in the environment) is associated with the rapid spread of the flatwing trait. Different social environments select for differential success of flatwing or normal-wing males, which in turn alters the social environment itself.
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Details

Original languageEnglish
JournalJournal of Animal Ecology
VolumeEarly View
Early online date5 Mar 2018
DOIs
Publication statusE-pub ahead of print - 5 Mar 2018

    Research areas

  • Behavioural preadaptation, Field cricket, Rapid evolution, Natural selection, Phenotypic plasticity, Sexual selection, Teleogryllus oceanicus

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