Projects per year
Abstract
A major challenge for studying the role of sexual selection in
divergence and speciation is understanding the relative influence of
different sexually selected signals on those processes in both intra‐
and interspecific contexts. Different signals may be more or less
susceptible to co‐option for species identification depending on the
balance of sexual and ecological selection acting upon them. To examine
this, we tested three predictions to explain geographic variation in
long‐ versus short‐range sexual signals across a 3,500 + km transect of
two related Australian field cricket species (Teleogryllus spp.):
(a) selection for species recognition, (b) environmental adaptation and
(c) stochastic divergence. We measured male calling song and male and
female cuticular hydrocarbons (CHCs) in offspring derived from wild
populations, reared under common garden conditions. Song clearly
differentiated the species, and no hybrids were observed suggesting that
hybridization is rare or absent. Spatial variation in song was not
predicted by geography, genetics or climatic factors in either species.
In contrast, CHC divergence was strongly associated with an
environmental gradient supporting the idea that the climatic environment
selects more directly upon these chemical signals. In light of recently
advocated models of diversification via ecological selection on
secondary sexual traits, the different environmental associations we
found for song and CHCs suggest that the impact of ecological selection
on population divergence, and how that influences speciation, might be
different for acoustic versus chemical signals.
Original language | English |
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Pages (from-to) | 990-1005 |
Number of pages | 16 |
Journal | Journal of Evolutionary Biology |
Volume | 33 |
Issue number | 7 |
Early online date | 27 Apr 2020 |
DOIs | |
Publication status | Published - Jul 2020 |
Keywords
- Acoustic signalling
- Character displacement
- Chemical signalling
- Ecological speciation
- Environmental selection
- Multi‐modal signalling
- Sexual selection
- Teleogryllus
Fingerprint
Dive into the research topics of 'Sexual selection and population divergence III: interspecific and intraspecific variation in mating signals'. Together they form a unique fingerprint.Projects
- 2 Finished
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Genomic Invasion: Genomic Invasion and the Role of Behaviour in Rapid Evolution.
Bailey, N. W. (PI)
1/10/14 → 4/12/20
Project: Standard
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Sexual Selection of Field Crickets: Social Learning and Sexual selection in field crickets
Bailey, N. W. (PI)
1/04/10 → 31/03/13
Project: Fellowship
Datasets
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Sexual selection and population divergence III: interspecific and intraspecific variation in mating signals (dataset)
Ritchie, M. G. (Creator) & Bailey, N. W. (Creator), Dryad, 2020
Dataset