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2016 ; 6
(10
): 3289-98
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Geographic variation in advertisement calls of a Microhylid frog - testing the
role of drift and ecology
#MMPMID27103987
Lee KH
; Shaner PJ
; Lin YP
; Lin SM
Ecol Evol
2016[May]; 6
(10
): 3289-98
PMID27103987
show ga
Acoustic signals for mating are important traits that could drive population
differentiation and speciation. Ecology may play a role in acoustic divergence
through direct selection (e.g., local adaptation to abiotic environment),
constraint of correlated traits (e.g., acoustic traits linked to another trait
under selection), and/or interspecific competition (e.g., character
displacement). However, genetic drift alone can also drive acoustic divergence.
It is not always easy to differentiate the role of ecology versus drift in
acoustic divergence. In this study, we tested the role of ecology and drift in
shaping geographic variation in the advertisement calls of Microhyla fissipes. We
examined three predictions based on ecological processes: (1) the correlation
between temperature and call properties across M. fissipes populations; (2) the
correlation between call properties and body size across M. fissipes populations;
and (3) reproductive character displacement (RCD) in call properties between
M. fissipes populations that are sympatric with and allopatric to a congener
M. heymonsi. To test genetic drift, we examined correlations among call
divergence, geographic distance, and genetic distance across M. fissipes
populations. We recorded the advertisement calls from 11 populations of
M. fissipes in Taiwan, five of which are sympatrically distributed with
M. heymonsi. We found geographic variation in both temporal and spectral
properties of the advertisement calls of M. fissipes. However, the call
properties were not correlated with local temperature or the callers' body size.
Furthermore, we did not detect RCD. By contrast, call divergence, geographic
distance, and genetic distance between M. fissipes populations were all
positively correlated. The comparisons between phenotypic Q st (P st) and F st
values did not show significant differences, suggesting a role of drift. We
concluded that genetic drift, rather than ecological processes, is the more
likely driver for the geographic variation in the advertisement calls of
M. fissipes.