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Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America

Resolving evolutionary relationships and establishing population structure depends on molecular diagnosability that is often limited for closely related taxa. Here, we use 3,200 ddRAD‐seq loci across 290 mallards, American black ducks, and putative hybrids to establish population structure and estim...

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Autores principales: Lavretsky, Philip, Janzen, Thijs, McCracken, Kevin G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6434578/
https://www.ncbi.nlm.nih.gov/pubmed/30962906
http://dx.doi.org/10.1002/ece3.4981
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author Lavretsky, Philip
Janzen, Thijs
McCracken, Kevin G.
author_facet Lavretsky, Philip
Janzen, Thijs
McCracken, Kevin G.
author_sort Lavretsky, Philip
collection PubMed
description Resolving evolutionary relationships and establishing population structure depends on molecular diagnosability that is often limited for closely related taxa. Here, we use 3,200 ddRAD‐seq loci across 290 mallards, American black ducks, and putative hybrids to establish population structure and estimate hybridization rates. We test between traditional assignment probability and accumulated recombination events based analyses to assign hybrids to generational classes. For hybrid identification, we report the distribution of recombination events complements ADMIXTURE simulation by extending resolution past F4 hybrid status; however, caution against hybrid assignment based on accumulated recombination events due to an inability to resolve F1 hybrids. Nevertheless, both analyses suggest that there are relatively few backcrossed stages before a lineage's hybrid ancestry is lost and the offspring are effectively parental again. We conclude that despite high rates of observed interspecific hybridization between mallards and black ducks in the middle part of the 20th century, our results do not support the predicted hybrid swarm. Conversely, we report that mallard samples genetically assigned to western and non‐western clusters. We indicate that these non‐western mallards likely originated from game‐farm stock, suggesting landscape level gene flow between domestic and wild conspecifics.
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spelling pubmed-64345782019-04-08 Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America Lavretsky, Philip Janzen, Thijs McCracken, Kevin G. Ecol Evol Original Research Resolving evolutionary relationships and establishing population structure depends on molecular diagnosability that is often limited for closely related taxa. Here, we use 3,200 ddRAD‐seq loci across 290 mallards, American black ducks, and putative hybrids to establish population structure and estimate hybridization rates. We test between traditional assignment probability and accumulated recombination events based analyses to assign hybrids to generational classes. For hybrid identification, we report the distribution of recombination events complements ADMIXTURE simulation by extending resolution past F4 hybrid status; however, caution against hybrid assignment based on accumulated recombination events due to an inability to resolve F1 hybrids. Nevertheless, both analyses suggest that there are relatively few backcrossed stages before a lineage's hybrid ancestry is lost and the offspring are effectively parental again. We conclude that despite high rates of observed interspecific hybridization between mallards and black ducks in the middle part of the 20th century, our results do not support the predicted hybrid swarm. Conversely, we report that mallard samples genetically assigned to western and non‐western clusters. We indicate that these non‐western mallards likely originated from game‐farm stock, suggesting landscape level gene flow between domestic and wild conspecifics. John Wiley and Sons Inc. 2019-02-27 /pmc/articles/PMC6434578/ /pubmed/30962906 http://dx.doi.org/10.1002/ece3.4981 Text en © 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Lavretsky, Philip
Janzen, Thijs
McCracken, Kevin G.
Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title_full Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title_fullStr Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title_full_unstemmed Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title_short Identifying hybrids & the genomics of hybridization: Mallards & American black ducks of Eastern North America
title_sort identifying hybrids & the genomics of hybridization: mallards & american black ducks of eastern north america
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6434578/
https://www.ncbi.nlm.nih.gov/pubmed/30962906
http://dx.doi.org/10.1002/ece3.4981
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