TY - JOUR
T1 - Sexual selection can increase the effect of random genetic drift - a quantitative genetic model of polymorphism in oophaga pumilio, the strawberry poison-dart frog
AU - Tazzyman, Samuel J.
AU - Iwasa, Yoh
PY - 2010/6/1
Y1 - 2010/6/1
N2 - The variation in color pattern between populations of the poison-dart frog Oophaga pumilio across the Bocas del Toro archipelago in Panama is suggested to be due to sexual selection, as two other nonsexually selecting Dendrobatid species found in the same habitat and range do not exhibit this variation. We theoretically test this assertion using a quantitative genetic sexual selection model incorporating aposematic coloration and random drift. We find that sexual selection could cause the observed variation via a novel process we call " coupled drift." Within our model, for certain parameter values, sexual selection forces frog color to closely follow the evolution of female preference. Any between-population variation in preference due to genetic drift is passed on to color. If female preference in O. pumilio is strongly affected by drift, whereas color in the nonsexually selecting Dendrobatid species is not, coupled drift will cause increased between-population phenotypic variation. However, with different parameter values, coupled drift will result in between-population variation in color being suppressed compared to its neutral value, or in little or no effect. We suggest that coupled drift is a novel theoretical process that could have a role linking sexual selection with speciation both in O. pumilio, and perhaps more generally.
AB - The variation in color pattern between populations of the poison-dart frog Oophaga pumilio across the Bocas del Toro archipelago in Panama is suggested to be due to sexual selection, as two other nonsexually selecting Dendrobatid species found in the same habitat and range do not exhibit this variation. We theoretically test this assertion using a quantitative genetic sexual selection model incorporating aposematic coloration and random drift. We find that sexual selection could cause the observed variation via a novel process we call " coupled drift." Within our model, for certain parameter values, sexual selection forces frog color to closely follow the evolution of female preference. Any between-population variation in preference due to genetic drift is passed on to color. If female preference in O. pumilio is strongly affected by drift, whereas color in the nonsexually selecting Dendrobatid species is not, coupled drift will cause increased between-population phenotypic variation. However, with different parameter values, coupled drift will result in between-population variation in color being suppressed compared to its neutral value, or in little or no effect. We suggest that coupled drift is a novel theoretical process that could have a role linking sexual selection with speciation both in O. pumilio, and perhaps more generally.
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U2 - 10.1111/j.1558-5646.2009.00923.x
DO - 10.1111/j.1558-5646.2009.00923.x
M3 - Article
C2 - 20015236
AN - SCOPUS:77953904059
VL - 64
SP - 1719
EP - 1728
JO - Evolution; international journal of organic evolution
JF - Evolution; international journal of organic evolution
SN - 0014-3820
IS - 6
ER -