Behavioural vs. molecular sources of conflict between nuclear and mitochondrial DNA: the role of male-biased dispersal in a Holarctic sea duck

Molecular Ecology
Jeffrey L PetersJohn M Pearce

Abstract

Genetic studies of waterfowl (Anatidae) have observed the full spectrum of mitochondrial (mt) DNA population divergence, from apparent panmixia to deep, reciprocally monophyletic lineages. Yet, these studies often found weak or no nuclear (nu) DNA structure, which was often attributed to male-biased gene flow, a common behaviour within this family. An alternative explanation for this 'conflict' is that the smaller effective population size and faster sorting rate of mtDNA relative to nuDNA lead to different signals of population structure. We tested these alternatives by sequencing 12 nuDNA introns for a Holarctic pair of waterfowl subspecies, the European goosander (Mergus merganser merganser) and the North American common merganser (M. m. americanus), which exhibit strong population structure in mtDNA. We inferred effective population sizes, gene flow and divergence times from published mtDNA sequences and simulated expected differentiation for nuDNA based on those histories. Between Europe and North America, nuDNA Ф(ST) was 3.4-fold lower than mtDNA Ф(ST) , a result consistent with differences in sorting rates. However, despite geographically structured and monophyletic mtDNA lineages within continents, nuDNA Ф(ST) values we...Continue Reading

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Citations

Jul 8, 2016·Ecology and Evolution·Rachel J SturgeKevin E Omland
May 24, 2014·Molecular Ecology·Jeffrey L PetersKevin G McCracken
Aug 6, 2019·Ecology and Evolution·Sarah A SonsthagenSandra L Talbot
Apr 3, 2021·Molecular Phylogenetics and Evolution·Philip LavretskySarah A Sonsthagen

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