Dec 16, 2014

Origin and cross-century dynamics of an avian hybrid zone

BioRxiv : the Preprint Server for Biology
Andrea Morales-RozoCarlos Daniel Cadena

Abstract

Background Characterizations of the dynamics of hybrid zones in space and time can give insights about traits and processes important in population divergence and speciation. We characterized a hybrid zone between tanagers in the genus Ramphocelus (Aves, Thraupidae) located in southwestern Colombia. We tested whether this hybrid zone originated as a result of secondary contact or of primary differentiation, and described its dynamics across time using spatial analyses of molecular, morphological, and coloration data in combination with paleodistribution modeling. Results Models of potential historical distributions based on climatic data and genetic signatures of demographic expansion suggested that the hybrid zone originated following secondary contact between populations that expanded their ranges out of isolated areas in the Quaternary. Concordant patterns of variation in phenotypic characters across the hybrid zone and its narrow extent are suggestive of a tension zone, maintained by a balance between dispersal and selection against hybrids. Estimates of phenotypic cline parameters obtained using specimens collected over nearly a century revealed that, in recent decades, the zone has moved to the east and to higher elevati...Continue Reading

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Mentioned in this Paper

Ramphocelus
Avian Proteins
Zone
Environment
Thraupidae
Morphological
Anatomical Space Structure
Genetic Activator
Cell Differentiation Process
Hybrids

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