Temporal variation in genetic structure within the threatened spectacled eider

Sonsthagen, Sarah A.; Haughey, Christy L.; Sexson, Matthew G.; Solovyeva, Diana; Petersen, Margaret R.; Powell, Abby N.

doi:10.1007/s10592-019-01234-9

Cited by 2 publications

(2 citation statements)

References 21 publications

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“…The Arctic reached population stability recently (10-15 years after the pre-decline samples), following only a few generations; thus, genetic variation can change rapidly, especially as species respond and recover via the continual action of microevolutionary and demographic process (e.g. Sonsthagen et al , 2019.…”

Section: Discussionmentioning

confidence: 99%

The DDT‐induced decline influenced genetic diversity in naturally recovered Peregrine falcons (Falco peregrinus) nesting within the Alaska Arctic and eastern interior

Sonsthagen

Swem

Ambrose

et al. 2022

Ibis

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We assessed the influence of the severe mid-20 th century population decline on genetic diversity in nonaugmented Peregrine Falcon Falco peregrinus populations nesting within the Alaska Arctic and eastern Interior. Microsatellite and mitochondrial DNA (mtDNA) data were analysed for Peregrine Falcons sampled from three periods: pre-decline, decline and post-decline. The influence of the decline on genetic diversity differed between the two locales. The Alaska Arctic was characterized by shifts in mtDNA haplotype frequencies, increased inbreeding coefficient, reduction in effective population size and increase in private haplotypes, and a signature of post-decline population growth was detected; by contrast, the eastern Interior showed a reduction in haplotype diversity and no differences in allelic or haplotypic frequencies between pre-and post-decline periods, though pre-decline birds clustered away from the other two periods and allelic frequency differences were observed between decline and post-decline periods. Patterns in genetic diversity suggest populations recovered through recruitment from within and immigration.

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Section: Discussionmentioning

confidence: 99%

The DDT‐induced decline influenced genetic diversity in naturally recovered Peregrine falcons (Falco peregrinus) nesting within the Alaska Arctic and eastern interior

Sonsthagen

Swem

Ambrose

et al. 2022

Ibis

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“…Specifically, we aim to test whether patterns of regional (Alaska, Yukon, Ontario) genetic differentiation within both species at autosomal and sex‐linked (Z‐chromosome) loci correspond to population structure identified by previous analyses of band recovery and maternally‐inherited mtDNA data (Pearce et al 2014). Given high wintering site fidelity (where pair formation likely occurs), high mtDNA differentiation ( F ST = 0.58; Pearce et al 2014) and strong intra‐specific nuclear genetic structure detected in other sea duck species (common eider, Somateria mollissima ; Sonsthagen et al 2011, but see Pearce et al 2004, 2005, Wilson et al 2016, Sonsthagen et al 2019, 2020b), we expect to find some level of structure in the nuclear genome. Despite high breeding site fidelity, a lack of genetic structure in Barrow's goldeneye along the Pacific Coast or common goldeneye between sampling regions would suggest that wintering areas are likely used by individuals hatched from multiple nesting regions, or that an initial dispersal event of juveniles acts to homogenize genetic diversity.…”

Section: Introductionmentioning

confidence: 99%

High site fidelity does not equate to population genetic structure for common goldeneye and Barrow's goldeneye in North America

Brown

Lavretsky

Wilson

et al. 2020

Journal of Avian Biology

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Delineation of population structure provides valuable information for conservation and management of species, as levels of demographic and genetic connectivity not only affect population dynamics but also have important implications for adaptability and resiliency of populations and species. Here, we measure population genetic structure and connectivity across the ranges of two sister species of sea ducks: Barrow's goldeneye Bucephala islandica and common goldeneye B. clangula. We use two different marker types: 7-8 nuclear microsatellite loci assayed across 229 samples and 3678 double digest restriction-site associated DNA sequencing (ddRAD-seq) loci assayed across 61 samples. First, both datasets found no evidence of genetic structure within common or Barrow's goldeneye, including between North American and European samples of common goldeneye. These results are in contrast with previous mitochondrial DNA, band recovery and telemetry data which suggest that goldeneyes are structured across their range. We posit that the discordance between autosomal genetic markers and other data types suggests that males, possibly subadult males, may be maintaining genetic connectivity across each species' respective ranges. Next, although mate choice consequences resulting from inter-specific brood parasitism was hypothesized to cause some level of gene flow between goldeneye species, we only identified a single F1 hybrid with no further evidence of contemporary or historical gene flow. Despite ddRAD-seq demographic analyses which recovered an optimum evolutionary model of split-with-migration (i.e. secondary contact), estimates of gene flow were <<1 migrant per generation in both directions. Together, we conclude that either strong ecological barriers or assortative mating are likely playing a role in preventing further backcrossing. Finally, demographic analyses estimated a relatively deep divergence time between Barrow's goldeneye and common goldeneye of ~1.6 million years before present and suggests that the genomes of both species have been under similar evolutionary constraints.

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Temporal variation in genetic structure within the threatened spectacled eider

Cited by 2 publications

References 21 publications

The DDT‐induced decline influenced genetic diversity in naturally recovered Peregrine falcons (Falco peregrinus) nesting within the Alaska Arctic and eastern interior

The DDT‐induced decline influenced genetic diversity in naturally recovered Peregrine falcons (Falco peregrinus) nesting within the Alaska Arctic and eastern interior

High site fidelity does not equate to population genetic structure for common goldeneye and Barrow's goldeneye in North America

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