NDLI: The Early Stages of Speciation in Amazonian Forest Frogs: Phenotypic Conservatism Despite Strong Genetic Structure

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The Early Stages of Speciation in Amazonian Forest Frogs: Phenotypic Conservatism Despite Strong Genetic Structure

Content Provider	Springer Nature Link
Author	Kaefer, Igor L. Tsuji Nishikido, Bru M. Mota, Edvaldo P. Farias, Izeni P. Lima, Albertina P.
Copyright Year	2012
Abstract	Phylogeographic perspectives incorporating multiple classes of characters, especially those relating to sexual signals, are promising for the elucidation of recent evolutionary mechanisms driving speciation. Here, forest frogs were used as a model system to access distinct stages in the process of evolutionary differentiation. We studied 280 individuals assigned to three species: Allobates paleovarzensis, A. nidicola and A. masniger. Samples were collected at 20 localities arranged in two study systems, along the middle Amazon and the lower Madeira Rivers, in Central Amazonia. Mantel tests, analyses of molecular variance, and the spatial distribution of haplogroups indicated that the distribution of genetic variability, as inferred from a mitochondrial DNA marker, was determined by a combination of isolation-by-distance effects and the transposition of large Amazonian rivers. These two factors had contrasting relative influences in each of the study systems, which also differed regarding the estimated time of the major cladogenetic events. Pronounced population genetic structure was observed. However, multivariate discriminant function analyses revealed that the phenotypic (morphological and acoustic) divergence was loosely related with genetic differentiation and did not successfully predict assignment of individuals to genetic groups. The observed distribution of genetic variability showed the important role of genetic drift in the diversification of the mitochondrial marker studied. The phenotypic conservatism among populations was surprising in view of the high genetic structuring observed, and indicates a prevailing role of stabilizing selective forces in the process of sexual signal and morphological differentiation.
Starting Page	228
Ending Page	245
Page Count	18
File Format	PDF
ISSN	00713260
Journal	Evolutionary Biology
Volume Number	40
Issue Number	2
e-ISSN	19342845
Language	English
Publisher	Springer US
Publisher Date	2012-10-31
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Genetic drift Integrative phylogeography Isolation by distance Mitochondrial DNA River barrier Sexual signals Evolutionary Biology Ecology Developmental Biology Human Genetics Animal Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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