Testing theories of sexual selection in decorated crickets (Gryllodes sigillatus)
Ketola, T., Kortet, R., & Kotiaho, J. S. (2007). Testing theories of sexual selection in decorated crickets (Gryllodes sigillatus). Evolutionary Ecology Research, 9, 869-885.
Published in
Evolutionary Ecology ResearchDate
2007Discipline
Ekologia ja evoluutiobiologiaEvoluutiotutkimus (huippuyksikkö)MuseoEcology and Evolutionary BiologyCentre of Excellence in Evolutionary ResearchMuseumCopyright
© 2007 Tarmo Ketola
Question: Do females choose males according to their level of acoustic sexual activity,
fluctuating asymmetry, size, condition or do they select for genetic compatibility according
to relatedness? What are the relative strengths of selection on these traits and what might be the
benefit of the choice – large nuptial gifts, heritable attractiveness or quality?
Organism: Laboratory colony of decorated crickets (Gryllodes sigillatus).
Methods: Behavioural trial of female preference on male traits, multivariate logistic regression
of male traits on female preference, and heritability estimation of the traits with an animal
model.
Results: Female attraction strongly discriminated in favour of certain male courtship call
rates. None of the other potential cues, such as size-dependent traits, fluctuating asymmetry
or relatedness were involved in sexual selection. In addition, no evidence of benefits of the
attraction was found. However, if the cost of choice for females is low, then the potential
genetic benefits outweighing it might be smaller than what can be estimated with this data set.
Moreover, the signal itself is a strong species-specific signal that facilitates mate location and
helps to prevent maladaptive hybridization. Thus, the signal itself may be considered a benefit
without any additional correlated benefits.
...
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