Divergence, gene flow, and the origin of leapfrog geographic distributions: The history of colour pattern variation in Phyllobates poison-dart frogs
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Divergence, gene flow, and the origin of leapfrog geographic distributions : The history of colour pattern variation in Phyllobates poison-dart frogs. / Márquez, Roberto; Linderoth, Tyler P.; Mejia-Vargas, Daniel; Nielsen, Rasmus; Amezquita, Adolfo; Kronforst, Marcus R.
I: Molecular Ecology, Bind 29, Nr. 19, 2020, s. 3702-3719.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Divergence, gene flow, and the origin of leapfrog geographic distributions
T2 - The history of colour pattern variation in Phyllobates poison-dart frogs
AU - Márquez, Roberto
AU - Linderoth, Tyler P.
AU - Mejia-Vargas, Daniel
AU - Nielsen, Rasmus
AU - Amezquita, Adolfo
AU - Kronforst, Marcus R.
PY - 2020
Y1 - 2020
N2 - The geographic distribution of phenotypic variation among closely related populations is a valuable source of information about the evolutionary processes that generate and maintain biodiversity. Leapfrog distributions, in which phenotypically similar populations are disjunctly distributed and separated by one or more phenotypically distinct populations, represent geographic replicates for the existence of a phenotype, and are therefore especially informative. These geographic patterns have mostly been studied from phylogenetic perspectives to understand how common ancestry and divergent evolution drive their formation. Other processes, such as gene flow between populations, have not received as much attention. Here, we investigate the roles of divergence and gene flow between populations in the origin and maintenance of a leapfrog distribution inPhyllobatespoison frogs. We found evidence for high levels of gene flow between neighbouring populations but not over long distances, indicating that gene flow between populations exhibiting the central phenotype may have a homogenizing effect that maintains their similarity, and that introgression between 'leapfroging' taxa has not played a prominent role as a driver of phenotypic diversity inPhyllobates. Although phylogenetic analyses suggest that the leapfrog distribution was formed through independent evolution of the peripheral (i.e. leapfrogging) populations, the elevated levels of gene flow between geographically close populations poise alternative scenarios, such as the history of phenotypic change becoming decoupled from genome-averaged patterns of divergence, which we cannot rule out. These results highlight the importance of incorporating gene flow between populations into the study of geographic variation in phenotypes, both as a driver of phenotypic diversity and as a confounding factor of phylogeographic inferences.
AB - The geographic distribution of phenotypic variation among closely related populations is a valuable source of information about the evolutionary processes that generate and maintain biodiversity. Leapfrog distributions, in which phenotypically similar populations are disjunctly distributed and separated by one or more phenotypically distinct populations, represent geographic replicates for the existence of a phenotype, and are therefore especially informative. These geographic patterns have mostly been studied from phylogenetic perspectives to understand how common ancestry and divergent evolution drive their formation. Other processes, such as gene flow between populations, have not received as much attention. Here, we investigate the roles of divergence and gene flow between populations in the origin and maintenance of a leapfrog distribution inPhyllobatespoison frogs. We found evidence for high levels of gene flow between neighbouring populations but not over long distances, indicating that gene flow between populations exhibiting the central phenotype may have a homogenizing effect that maintains their similarity, and that introgression between 'leapfroging' taxa has not played a prominent role as a driver of phenotypic diversity inPhyllobates. Although phylogenetic analyses suggest that the leapfrog distribution was formed through independent evolution of the peripheral (i.e. leapfrogging) populations, the elevated levels of gene flow between geographically close populations poise alternative scenarios, such as the history of phenotypic change becoming decoupled from genome-averaged patterns of divergence, which we cannot rule out. These results highlight the importance of incorporating gene flow between populations into the study of geographic variation in phenotypes, both as a driver of phenotypic diversity and as a confounding factor of phylogeographic inferences.
KW - convergent evolution
KW - dendrobatidae
KW - phylogeography
KW - spatial population genetics
KW - LIMONIUM-WRIGHTII PLUMBAGINACEAE
KW - POISON FROGS
KW - RAIN-FOREST
KW - PHYLOGENETIC ANALYSIS
KW - COLOMBIAN PACIFIC
KW - EVOLUTION
KW - SEQUENCE
KW - GENOME
KW - GENERATION
KW - DNA
U2 - 10.1111/mec.15598
DO - 10.1111/mec.15598
M3 - Journal article
C2 - 32814358
VL - 29
SP - 3702
EP - 3719
JO - Molecular Ecology
JF - Molecular Ecology
SN - 0962-1083
IS - 19
ER -
ID: 249429329