Old divergence and restricted gene flow between torrent duck (Merganetta armata) subspecies in the Central and Southern Andes
AIM: To investigate the structure and rate of gene flow among populations of habitat-specialized species to understand the ecological and evolutionary processes underpinning their population dynamics and historical demography, including speciation and extinction.
LOCATION: Peruvian and Argentine Andes.
TAXON: Two subspecies of torrent duck (Merganetta armata).
METHODS: We sampled 156 individuals in Peru (M. a. leucogenis; Chillón River, n = 57 and Pachachaca River, n = 49) and Argentina (M. a. armata; Arroyo Grande River, n = 33 and Malargüe River, n = 17), and sequenced the mitochondrial DNA (mtDNA) control region to conduct coarse and fine-scale demographic analyses of population structure. Additionally, to test for differences between subspecies, and across genetic markers with distinct inheritance patterns, a subset of individuals (Peru, n = 10 and Argentina, n = 9) was subjected to partial genome resequencing, obtaining 4,027 autosomal and 189 Z-linked double-digest restriction-associated DNA sequences.
RESULTS: Haplotype and nucleotide diversities were higher in Peru than Argentina across all markers. Peruvian and Argentine subspecies showed concordant species-level differences (ΦST mtDNA = 0.82; ΦST autosomal = 0.30; ΦST Z chromosome = 0.45), including no shared mtDNA haplotypes. Demographic parameters estimated for mtDNA using IM and IMa2 analyses, and for autosomal markers using ∂a∂i (isolation-with-migration model), supported an old divergence (mtDNA = 600,000 years before present (ybp), 95% HPD range = 1.2 Mya to 200,000 ybp; and autosomal ∂a∂i = 782,490 ybp), between the two subspecies, characteristic of deeply diverged lineages. The populations were well-differentiated in Argentina but moderately differentiated in Peru, with low unidirectional gene flow in each country.
MAIN CONCLUSIONS: We suggest that the South American Arid Diagonal was preexisting and remains a current phylogeographic barrier between the ranges of the two torrent duck subspecies, and the adult territoriality and breeding site fidelity to the rivers define their population structure.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2019 |
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| Erschienen: |
2019 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:9 |
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| Enthalten in: |
Ecology and evolution - 9(2019), 17 vom: 01. Sept., Seite 9961-9976 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Alza, Luis [VerfasserIn] |
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| Links: |
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| Themen: |
Andes |
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| Anmerkungen: |
Date Revised 14.10.2023 published: Electronic-eCollection Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1002/ece3.5538 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM301429294 |
|---|
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| 100 | 1 | |a Alza, Luis |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Old divergence and restricted gene flow between torrent duck (Merganetta armata) subspecies in the Central and Southern Andes |
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| 500 | |a Date Revised 14.10.2023 | ||
| 500 | |a published: Electronic-eCollection | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a AIM: To investigate the structure and rate of gene flow among populations of habitat-specialized species to understand the ecological and evolutionary processes underpinning their population dynamics and historical demography, including speciation and extinction | ||
| 520 | |a LOCATION: Peruvian and Argentine Andes | ||
| 520 | |a TAXON: Two subspecies of torrent duck (Merganetta armata) | ||
| 520 | |a METHODS: We sampled 156 individuals in Peru (M. a. leucogenis; Chillón River, n = 57 and Pachachaca River, n = 49) and Argentina (M. a. armata; Arroyo Grande River, n = 33 and Malargüe River, n = 17), and sequenced the mitochondrial DNA (mtDNA) control region to conduct coarse and fine-scale demographic analyses of population structure. Additionally, to test for differences between subspecies, and across genetic markers with distinct inheritance patterns, a subset of individuals (Peru, n = 10 and Argentina, n = 9) was subjected to partial genome resequencing, obtaining 4,027 autosomal and 189 Z-linked double-digest restriction-associated DNA sequences | ||
| 520 | |a RESULTS: Haplotype and nucleotide diversities were higher in Peru than Argentina across all markers. Peruvian and Argentine subspecies showed concordant species-level differences (ΦST mtDNA = 0.82; ΦST autosomal = 0.30; ΦST Z chromosome = 0.45), including no shared mtDNA haplotypes. Demographic parameters estimated for mtDNA using IM and IMa2 analyses, and for autosomal markers using ∂a∂i (isolation-with-migration model), supported an old divergence (mtDNA = 600,000 years before present (ybp), 95% HPD range = 1.2 Mya to 200,000 ybp; and autosomal ∂a∂i = 782,490 ybp), between the two subspecies, characteristic of deeply diverged lineages. The populations were well-differentiated in Argentina but moderately differentiated in Peru, with low unidirectional gene flow in each country | ||
| 520 | |a MAIN CONCLUSIONS: We suggest that the South American Arid Diagonal was preexisting and remains a current phylogeographic barrier between the ranges of the two torrent duck subspecies, and the adult territoriality and breeding site fidelity to the rivers define their population structure | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Andes | |
| 650 | 4 | |a Merganetta armata | |
| 650 | 4 | |a gene flow | |
| 650 | 4 | |a genetic diversity | |
| 650 | 4 | |a population structure | |
| 650 | 4 | |a time since divergence | |
| 700 | 1 | |a Lavretsky, Philip |e verfasserin |4 aut | |
| 700 | 1 | |a Peters, Jeffrey L |e verfasserin |4 aut | |
| 700 | 1 | |a Cerón, Gerardo |e verfasserin |4 aut | |
| 700 | 1 | |a Smith, Matthew |e verfasserin |4 aut | |
| 700 | 1 | |a Kopuchian, Cecilia |e verfasserin |4 aut | |
| 700 | 1 | |a Astie, Andrea |e verfasserin |4 aut | |
| 700 | 1 | |a McCracken, Kevin G |e verfasserin |4 aut | |
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