Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow<i>(Ammodramus caudacutus)</i>

Walsh, Jennifer; Kovach, Adrienne I.; Babbitt, Kimberly J.; O’Brien, Kathleen

doi:10.1525/auk.2012.11153

Cited by 27 publications

(31 citation statements)

References 101 publications

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“…populations, in which a substantial proportion of breeding adults return to the local population across years (Harmsen andCooke 1983, Bensch et al 1999). The pattern of annual variation was especially pronounced at Chapman's Landing, a small site that is relatively isolated and has reduced gene flow from other Saltmarsh Sparrow populations (Walsh et al 2012) and high numbers of returning breeding adults (A. Kovach and B. Benvenuti personal observation). In addition, due to its small size, nest detection rates were higher at Chapman's Landing and sample sizes were the highest among our 4 sites, likely leading to higher statistical power at the site level.…”

Section: Discussionmentioning

confidence: 99%

Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis

Benvenuti

Walsh

O’Brien

et al. 2018

The Auk

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Section: Discussionmentioning

confidence: 99%

Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis

Benvenuti

Walsh

O’Brien

et al. 2018

The Auk

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“…Where these two sparrows co-occur, from central Maine south to northern Massachusetts (Hodgman et al 2002), they hybridize and can be challenging to identify on the basis of phenotypic plumage differences when in the hand, after capture, or during passive surveys, adding to the complexity of estimating and tracking populations over time (Shriver et al 2005;Walsh et al 2011Walsh et al , 2012. Because tidal marshes are not adequately surveyed by the Breeding Bird Survey (Sauer et al 2011), population status or trends for these species and the factors that may influence populations are unknown.…”

Section: Introductionmentioning

confidence: 99%

Population abundance and trends of Saltmarsh (Ammodramus caudacutus) and Nelson’s (A. nelsoni) Sparrows: influence of sea levels and precipitation

et al. 2015

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“…2005; Walsh et al. 2012) suggests that these loci may be under selection (Storz 2005; Strasburg et al. 2012).…”

Section: Discussionmentioning

confidence: 99%

“…F ST among A. caudacutus in this study is similar to that previously reported by Walsh et al. (2012) using anonymous neutral loci. Despite high levels of gene flow, Walsh et al.…”

Section: Discussionmentioning

confidence: 99%

“…2005; Walsh et al. 2012) and lack the resolution to differentiate genotypic classes of admixed individuals (e.g., F1, F2, and backcrossed to each parental species). Difficulties in distinguishing pure and admixed individuals hinder efforts to evaluate the productivity and viability of populations in the hybrid zone, as well as to fully evaluate the geographic extent of introgression.…”

Section: Introductionmentioning

confidence: 99%

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Development of diagnostic microsatellite markers from whole‐genome sequences ofAmmodramussparrows for assessing admixture in a hybrid zone

Kovach

Walsh

Ramsdell

et al. 2015

Ecology and Evolution

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Studies of hybridization and introgression and, in particular, the identification of admixed individuals in natural populations benefit from the use of diagnostic genetic markers that reliably differentiate pure species from each other and their hybrid forms. Such diagnostic markers are often infrequent in the genomes of closely related species, and genomewide data facilitate their discovery. We used whole-genome data from Illumina HiSeqS2000 sequencing of two recently diverged (600,000 years) and hybridizing, avian, sister species, the Saltmarsh (Ammodramus caudacutus) and Nelson's (A. nelsoni) Sparrow, to develop a suite of diagnostic markers for high-resolution identification of pure and admixed individuals. We compared the microsatellite repeat regions identified in the genomes of the two species and selected a subset of 37 loci that differed between the species in repeat number. We screened these loci on 12 pure individuals of each species and report on the 34 that successfully amplified. From these, we developed a panel of the 12 most diagnostic loci, which we evaluated on 96 individuals, including individuals from both allopatric populations and sympatric individuals from the hybrid zone. Using simulations, we evaluated the power of the marker panel for accurate assignments of individuals to their appropriate pure species and hybrid genotypic classes (F1, F2, and backcrosses). The markers proved highly informative for species discrimination and had high accuracy for classifying admixed individuals into their genotypic classes. These markers will aid future investigations of introgressive hybridization in this system and aid conservation efforts aimed at monitoring and preserving pure species. Our approach is transferable to other study systems consisting of closely related and incipient species.

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Fine-scale population structure and asymmetrical dispersal in an obligate salt-marsh passerine, the Saltmarsh Sparrow(Ammodramus caudacutus)

Cited by 27 publications

References 101 publications

Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis

Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis

Population abundance and trends of Saltmarsh (Ammodramus caudacutus) and Nelson’s (A. nelsoni) Sparrows: influence of sea levels and precipitation

Development of diagnostic microsatellite markers from whole‐genome sequences ofAmmodramussparrows for assessing admixture in a hybrid zone

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