Coast to coast: High genomic connectivity in North American scoters

Ecology and Evolution
Sarah A SonsthagenS L Talbot

Abstract

Dispersal shapes demographic processes and therefore is fundamental to understanding biological, ecological, and evolutionary processes acting within populations. However, assessing population connectivity in scoters (Melanitta sp.) is challenging as these species have large spatial distributions that span remote landscapes, have varying nesting distributions (disjunct vs. continuous), exhibit unknown levels of dispersal, and vary in the timing of the formation of pair bonds (winter vs. fall/spring migration) that may influence the distribution of genetic diversity. Here, we used double-digest restriction-associated DNA sequence (ddRAD) and microsatellite genotype data to assess population structure within the three North American species of scoter (black scoter, M. americana; white-winged scoter, M. deglandi; surf scoter, M. perspicillata), and between their European congeners (common scoter, M. nigra; velvet scoter, M. fusca). We uncovered no or weak genomic structure (ddRAD ΦST < 0.019; microsatellite FST < 0.004) within North America but high levels of structure among European congeners (ddRAD ΦST > 0.155, microsatellite FST > 0.086). The pattern of limited genomic structure within North America is shared with other sea duc...Continue Reading

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Citations

Apr 3, 2021·Molecular Phylogenetics and Evolution·Philip LavretskySarah A Sonsthagen

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Datasets Mentioned

BETA
AF180500

Methods Mentioned

BETA
electrophoresis
PCR
genotyping

Software Mentioned

NEXUS
R
RADGenotypes
SA
STRUCTURE
Python
ddRAD
ADMIXTURE
FSTAT
CLUMPP

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