Displaced clines in an avian hybrid zone (Thamnophilidae:Rhegmatorhina) within an Amazonian interfluve*

2021/10/09 by Glaucia Del‐Rio, Marco Antonio Rêgo, Marco A. Rego +7 · 42 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · Environmental Science · #Amazon rainforest #Amazonian #Biology #Contact zone #Ecology #Ecology and Vegetation Dynamics Studies #Evolutionary biology #Gene flow #Genetic diversity and population structure #Genetic drift #Genetic variation #Genetics #Hybrid zone #Introgression #Obligate #Plant and animal studies

paper · open access · doi:10.1111/evo.14377

published in Evolution 76(3), 455-475 (Oxford University Press)

openalex publication_date 2021/10/09 · openalex created_date 2021/10/25 · openalex updated_date 2026/08/01

Abstract

Secondary contact between species often results in the formation of a hybrid zone, with the eventual fates of the hybridizing species dependent on evolutionary and ecological forces. We examine this process in the Amazon Basin by conducting the first genomic and phenotypic characterization of the hybrid zone formed after secondary contact between two obligate army-ant-followers: the White-breasted Antbird (Rhegmatorhina hoffmannsi) and the Harlequin Antbird (Rhegmatorhina berlepschi). We found a major geographic displacement (∼120 km) between the mitochondrial and nuclear clines, and we explore potential hypotheses for the displacement, including sampling error, genetic drift, and asymmetric cytonuclear incompatibilities. We cannot exclude roles for sampling error and genetic drift in contributing to the discordance; however, the data suggest expansion and unidirectional introgression of hoffmannsi into the distribution of berlepschi.

Citations

• Basic local alignment search tool
• Mating systems, philopatry and dispersal in birds and mammals

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