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Variation in sexual dimorphism and assortative mating do not predict genetic divergence in the sexually dimorphic Goodeid fish Girardinichthys multiradiatus

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Ritchie2012CurrentZoology58_3_Variationinsexualdimorphism.pdf (345.0Kb)
Date
2012
Author
Macias Garcia, C.
Smith, G.
Gonzalez Zuarth, C.
Graves, J. A.
Ritchie, M. G.
Funder
NERC
Grant ID
NE/E008216/1
Keywords
Sexual dimorphism
Assortative mating
Genetic distance
Speciation
Viviparous fish
QL Zoology
QH Natural history
Metadata
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Abstract
Sexual dimorphism is often used as a proxy for the intensity of sexual selection in comparative studies of sexual selection and diversification. The Mexican Goodeinae are a group of livebearing freshwater fishes with large variation between species in sexual dimorphism in body shape. Previously we found an association between variation in morphological sexual dimorphism between species and the amount of gene flow within populations in the Goodeinae. Here we have examined if morphological differentiation within a single dimorphic species is related to assortative mating or gene flow between populations. In the Amarillo fish Girardinichthys multiradiatus studies have shown that exaggerated male fins are targets of female preferences. We find that populations of the species differ in the level of sexual dimorphism displayed due to faster evolution of differences in male than female morphology. However, this does not predict variation in assortative mating tests in the laboratory; in fact differences in male morphology are negatively correlated with assortative mating. Microsatellite markers reveal significant genetic differences between populations. However, gene flow is not predicted by either morphological differences or assortative mating. Rather, it demonstrates a pattern of isolation by distance with greater differentiation between watersheds. We discuss the caveats of predicting behavioural and genetic divergence from so-called proxies of sexual selection [Current Zoology 58 (3): 440-452, 2012].
Citation
Macias Garcia , C , Smith , G , Gonzalez Zuarth , C , Graves , J A & Ritchie , M G 2012 , ' Variation in sexual dimorphism and assortative mating do not predict genetic divergence in the sexually dimorphic Goodeid fish Girardinichthys multiradiatus ' , Current Zoology , vol. 58 , no. 3 , pp. 440-452 . https://doi.org/10.1093/czoolo/58.3.440
Publication
Current Zoology
Status
Peer reviewed
DOI
https://doi.org/10.1093/czoolo/58.3.440
ISSN
1674-5507
Type
Journal article
Rights
(c) Current Zoology. This is an open access article, deposited by permission of the publisher.
Collections
  • University of St Andrews Research
URL
http://www.currentzoology.org/paperdetail.asp?id=12053
URI
http://hdl.handle.net/10023/3483

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