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Walsh J, Rowe RJ, Olsen BJ, et al. Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds. Ecol Evol. 2015;6(1):279-94doi: 10.1002/ece3.1864.
Walsh, J., Rowe, R. J., Olsen, B. J., Shriver, W. G., & Kovach, A. I. (2016). Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds. Ecology and evolution, 6(1), 279-94. https://doi.org/10.1002/ece3.1864
Walsh, Jennifer, et al. "Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds." Ecology and evolution vol. 6,1 (2016): 279-94. doi: https://doi.org/10.1002/ece3.1864
Walsh J, Rowe RJ, Olsen BJ, Shriver WG, Kovach AI. Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds. Ecol Evol. 2015 Dec 29;6(1):279-94. doi: 10.1002/ece3.1864. eCollection 2016 Jan. PMID: 26811792; PMCID: PMC4716509.
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Ecol Evol. 2015 Dec 29;6(1):279-94. doi: 10.1002/ece3.1864. eCollection 2016 Jan.

Genotype-environment associations support a mosaic hybrid zone between two tidal marsh birds.

Ecology and evolution

Jennifer Walsh, Rebecca J Rowe, Brian J Olsen, W Gregory Shriver, Adrienne I Kovach

Affiliations

  1. Department of Natural Resources and the Environment University of New Hampshire Durham New Hampshire.
  2. School of Biology and Ecology University of Maine Orono Maine.
  3. Department of Entomology and Wildlife Ecology University of Delaware Newark Delaware.

PMID: 26811792 PMCID: PMC4716509 DOI: 10.1002/ece3.1864

Abstract

Local environmental features can shape hybrid zone dynamics when hybrids are bounded by ecotones or when patchily distributed habitat types lead to a corresponding mosaic of genotypes. We investigated the role of marsh-level characteristics in shaping a hybrid zone between two recently diverged avian taxa - Saltmarsh (Ammodramus caudacutus) and Nelson's (A. nelsoni) sparrows. These species occupy different niches where allopatric, with caudacutus restricted to coastal marshes and nelsoni found in a broader array of wetland and grassland habitats and co-occur in tidal marshes in sympatry. We determined the influence of habitat types on the distribution of pure and hybrid sparrows and assessed the degree of overlap in the ecological niche of each taxon. To do this, we sampled and genotyped 305 sparrows from 34 marshes across the hybrid zone and from adjacent regions. We used linear regression to test for associations between marsh characteristics and the distribution of pure and admixed sparrows. We found a positive correlation between genotype and environmental variables with a patchy distribution of genotypes and habitats across the hybrid zone. Ecological niche models suggest that the hybrid niche was more similar to that of A. nelsoni and habitat suitability was influenced strongly by distance from coastline. Our results support a mosaic model of hybrid zone maintenance, suggesting a role for local environmental features in shaping the distribution and frequency of pure species and hybrids across space.

Keywords: Ammodramus caudacutus; Ammodramus nelsoni; Nelson's sparrow; Saltmarsh sparrow; ecological niche models; genotype‐habitat associations; hybridization; mosaic hybrid zone

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