Old divergence and restricted gene flow between torrent duck (Merganetta armata) subspecies in the Central and Southern Andes

Luis Alza, Philip Lavretsky, Jeffrey L. Peters, Gerardo Cerón, Matthew Smith, Cecilia Kopuchian, Andrea Astie, Kevin G. McCracken

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
JournalEcology and Evolution
DOIs
StateAccepted/In press - Jan 1 2019
Externally publishedYes

Fingerprint

Arma
torrent
mitochondrial DNA
ducks
subspecies
gene flow
Peru
divergence
Argentina
rivers
river
population structure
haplotypes
demographic statistics
Z chromosome
site fidelity
territoriality
genetic marker
breeding site
philopatry

Keywords

  • Andes
  • gene flow
  • genetic diversity
  • Merganetta armata
  • population structure
  • time since divergence

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Nature and Landscape Conservation

Cite this

Old divergence and restricted gene flow between torrent duck (Merganetta armata) subspecies in the Central and Southern Andes. / Alza, Luis; Lavretsky, Philip; Peters, Jeffrey L.; Cerón, Gerardo; Smith, Matthew; Kopuchian, Cecilia; Astie, Andrea; McCracken, Kevin G.

In: Ecology and Evolution, 01.01.2019.

Research output: Contribution to journalArticle

Alza, Luis ; Lavretsky, Philip ; Peters, Jeffrey L. ; Cerón, Gerardo ; Smith, Matthew ; Kopuchian, Cecilia ; Astie, Andrea ; McCracken, Kevin G. / Old divergence and restricted gene flow between torrent duck (Merganetta armata) subspecies in the Central and Southern Andes. In: Ecology and Evolution. 2019.
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AU - Cerón, Gerardo

AU - Smith, Matthew

AU - Kopuchian, Cecilia

AU - Astie, Andrea

AU - McCracken, Kevin G.

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